· Google Scholar: Author Only Title Only Author and Title Shi T, Bibby TS, Jiang L, Irwin AJ,...
Transcript of · Google Scholar: Author Only Title Only Author and Title Shi T, Bibby TS, Jiang L, Irwin AJ,...
1
Short title Synthetic biology of photosynthesis 1
2
Author for contact details 3
Dario Leister 4
Ludwig-Maximilians-University Munich 5
Faculty of Biology 6
Groszlighaderner Str 2 7
D-82152 Planegg-Martinsried 8
Germany 9
Phone +49-892180 74550 10
Fax +49-892180 74599 11
Email leisterlmude 12
13
Genetic engineering synthetic biology and the light reactions of photosynthesis1 14
15
Dario Leister 16
17
Plant Molecular Biology Faculty of Biology Ludwig-Maximilians-University Munich D-18
82152 Planegg-Martinsried Germany 19
20
21
One-sentence summary Applications of synthetic biology to photosynthesis currently range 22
from exchanging photosynthetic proteins to the utilization of photosynthesis as a source of 23
electrons for entirely unrelated reactions 24
25
Plant Physiology Preview Published on July 10 2018 as DOI101104pp1800360
Copyright 2018 by the American Society of Plant Biologists
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1 This work was funded by the Deutsche Forschungsgemeinschaft (DFG TRR 175 and GRK 26
2062) 27
28
Address correspondence to leisterlmude 29
ORCID IDs 0000-0003-1897-8421 (DL) 30
31
Oxygenic photosynthesis is imperfect and the evolutionarily conditioned patchwork nature of 32
the light reactions in plants provides ample scope for their improvement (Leister 2012 33
Blankenship and Chen 2013) In fact only around 40 of the incident solar energy is used 34
for photosynthesis Two obvious ways of reducing energy loss are to expand the spectral 35
band used for photosynthesis and to shift saturation of the process to higher light intensities 36
Indeed even minor enhancements to the efficiency or stress resistance of the light reactions 37
of photosynthesis should have a positive impact on biomass production and yield (Leister 38
2012 Blankenship and Chen 2013 Long et al 2015) 39
However modifications to the essential structure of the light reactions of plant 40
photosynthesis are currently limited by two main factors One is the high degree of 41
conservation of their structural components which limits the efficiency gains attainable by 42
conventional breeding approaches (Dann and Leister 2017) The second is that the 43
organization of these structural components into multiprotein complexes requires the 44
simultaneous tailoring of several proteins some of them encoded by different genetic systems 45
in different subcellular compartments (nucleus and chloroplasts) in land plants Therefore 46
successful modification of the light reactions of plant photosynthesis has been limited to a 47
few cases Similarly modification of the activity of auxiliary proteins involved in the 48
regulation of the light reactions to enhance plant growth and yield has only recently resulted 49
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in successful outcomes and is limited to a small subset of regulatory proteins (Pribil et al 50
2010 Kromdijk et al 2016 Glowacka et al 2018) 51
In addition to enhancing the light reactions for improved biomass production and 52
yield concepts have been developed for the direct coupling of photosynthesis to other 53
important pathways that are indirectly connected to photosynthesis in natural systems for 54
instance because they reside in different subcellular compartments (Lassen et al 2014a) 55
Direct coupling would be expected to boost the production of rare compounds in cells and 56
contribute to the biotechnological production of high-value compounds in vivo 57
In vitro it is possible to functionally link components of photosynthesis with entirely 58
unrelated biotic or abiotic catalysts or with abiotic electrode materials In fact Photosystem I 59
(PSI) is naturally adapted for highly efficient light harvesting and charge separation (Kargul 60
et al 2012 Nguyen and Bruce 2014 Martin and Frymier 2017) and has been described as 61
the most efficient natural nano-photochemical machine (Nelson 2009) Upon light excitation 62
PSI produces the most powerful naturally occurring reducing agent ndash P700 ndash which 63
together with an exceptionally long-lived charge-separated state provides sufficient driving 64
force to reduce protons to H2 at neutral pH PSI operates with a quantum yield close to 10 65
and currently no synthetic system has approached its remarkable efficiency Moreover PSI 66
preparations are generally robust especially those obtained from extremophilic microalgae 67
(Kubota et al 2010 Haniewicz et al 2018) The superior qualities of PSI have stimulated 68
strategies designed to generate in vitro hybrids of PSI and various types of redox-active 69
catalysts or other materials 70
In sum the light reactions of photosynthesis are a prime target for genetic engineering 71
and synthetic biology approaches for three major reasons (1) Enhancement of the process in 72
vivo to increase the efficiency of light use promises to increase biomass and crop yields (2) 73
Coupling of the light reactions of photosynthesis to previously unconnected pathways will 74
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4
enable us to utilize the reducing power of the light reactions directly to produce large 75
amounts of high-value compounds in vivo (3) The high efficiency and robustness of PSI 76
should allow it to be used in hybrids with biotic or abiotic components to generate hydrogen 77
simple carbon-based solar fuels or electricity in vitro In this review the background to and 78
recent developments in these three strategies are discussed 79
80
Natural building blocks of photosynthesis 81
During photosynthesis carbon dioxide (CO2) is converted into organic compounds 82
principally sugars using sunlight as energy In plants algae and cyanobacteria 83
photosynthesis uses water as the electron donor for chemical reduction of CO2 and releases 84
oxygen Algae and plants derive from a lineage that arose from an endosymbiotic relationship 85
between a protist and a cyanobacterium Chloroplasts the photosynthetic organelles in 86
modern plants are in fact the descendants of this ancient symbiotic cyanobacterium and 87
possess an internal membrane system that resembles the thylakoid membranes of modern-day 88
cyanobacteria Indeed during the evolutionary transition from cyanobacteria to chloroplasts 89
the overall organization and mode of action of the photosynthetic machinery was retained 90
(Box 1) However significant changes have occurred in the subunit composition of 91
photosystems (Fig 1) their posttranslational modification (Pesaresi et al 2011) the 92
harvesting of light energy pigment composition and regulation of photosynthesis (Box 93
2)(Mullineaux and Emlyn-Jones 2005 Rochaix 2007 Holt et al 2004 de Bianchi et al 94
2010) 95
Its evolutionary history makes photosynthesis well-suited for synthetic biology 96
strategies The evolutionary diversification of the photosynthetic machinery has provided a 97
set of building blocks ranging from single proteins such as the soluble electron transporters 98
(plastocyanin cytochrome c6 flavodoxin and ferredoxin) to multiprotein complexes like 99
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photosystems and antenna complexes (phycobiliosomes and light-harvesting complexes 100
(LHCs)) In principle the building blocks should be interchangeable between cyanobacteria 101
algae and plants Instances of the swapping of homologous photosynthetic proteins between 102
species by means of genetic engineering are discussed in the next section to highlight the 103
complications associated with apparently straightforward approaches The focus then shifts to 104
genuinely synthetic approaches in which specific photosynthetic building blocks have been 105
introduced into photosynthetic species that lack them In the subsequent two sections the 106
combination of non-photosynthetic (Bio-bio hybrids using photosynthesis as an electron 107
source for unrelated biological processes) and non-biological building blocks (Bio-nano 108
hybrids using photosynthesis as an electron source for non-biological processes) with 109
components of the photosynthetic machinery are described An overview of these approaches 110
is provided in Figure 2 111
112
Exchange of conserved photosynthetic modules 113
Theoretically it should be relatively easy to exchange individual conserved photosynthetic 114
proteins between different species even in such distantly related organisms as cyanobacteria 115
and plants However in practice these simple genetic engineering exercises can be 116
problematic (Table 1) Several individual proteins from cyanobacterial PSII (D1 CP43 and 117
PsbH) and PSI (PsaA) have indeed been genetically replaced by their plant counterparts with 118
varying success Synechocystis strains expressing the D1 protein from Poa annua or PsbH 119
from maize (Zea mays) could still perform photosynthesis ndash albeit with less efficiency than 120
the WT strain (Nixon et al 1991 Chiaramonte et al 1999) ndash but replacement of 121
Synechocystis CP43 or CP47 by their homologs from spinach (Spinacia oleracea) was 122
incompatible with photoautotrophy (Carpenter et al 1993 Vermaas et al 1996) Similarly 123
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in Synechocystis strains equipped with Arabidopsis thaliana PsaA PSI function was severely 124
disrupted (Viola et al 2014) 125
Such complications resulting from the replacement of core subunits of photosystems 126
despite their high similarity (78ndash86 identity between the cyanobacterial and plant proteins 127
Table 1) reflect the so-called ldquofrozen metabolic staterdquo of the photosynthetic multiprotein 128
complexes This term was coined by Gimpel et al (2016) but was originally introduced as 129
ldquofrozen metabolic accidentrdquo by Shi et al (2005) The ldquofrozen metabolic accidentrdquo concept 130
refers to the observation that selection has not significantly altered biophysically and 131
physiologically inefficient photosynthetic proteins (including the D1 protein of PSII or 132
RuBisCO of the Calvin-Benson cycle) over billions of years of evolution In fact 133
bioinformatic analysis of photosynthetic cyanobacterial genes suggests that the evolution rate 134
of proteins at the core of the photosynthetic apparatus is highly constrained by protein-135
protein protein-lipid and protein-cofactor interactions (Shi et al 2005) This provides an 136
internal selection pressure conserving the sequence of proteins in photosynthetic 137
multiprotein complexes and ndash in case of prokaryotes ndash also the genomic organization of their 138
genes (Shi et al 2005) The term ldquofrozen metabolic accidentrdquo was generalized to ldquofrozen 139
metabolic staterdquo by Gimpel et al (2016) and implies that in each photosynthetic species 140
slightly distinct modules of the cores of photosynthetic multiprotein complexes have evolved 141
that are optimized with respect to their intrinsic interactions and that rarely tolerate the 142
alteration of single proteins by exchange or mutation In consequence the simultaneous 143
exchange of entire sets of core proteins (or ldquomodulesrdquo) with all their intrinsic interactions 144
should be more feasible than substituting individual proteins that may disrupt the ldquofrozen 145
metabolic staterdquo Such an experiment has been performed in the green alga Chlamydomonas 146
reinhardtii where the six PSII core proteins D1 CP47 CP43 D2 Cyt b559- and were 147
swapped for their homologs from two other green algal species (Gimpel et al 2016) 148
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Photoautotrophy was not affected by the exchange of this synthetic biology module although 149
the fully altered strains performed suboptimally compared to strains in which only 1ndash5 genes 150
were exchanged However in control experiments where the synthetic C reinhardtii six-gene 151
module was re-introduced to the C reinhardtii deletion strain that lacked all six genes only 152
about 86 of wild-type PSII functionality was rescued Tentative explanations for this 153
decreased efficiency include (i) off-target effects of the PSII gene deletions on the operon 154
components and tRNA genes associated with these PSII loci (ii) misregulation of the 155
transferred PSII genes because their expression cassettes lacked unidentified cis-acting DNA 156
elements and (iii) perturbation of polycistron-dependent post-transcriptional regulation of the 157
transformed genes since they were no longer part of an operon (Gimpel et al 2016) 158
Taken together the outcomes of these replacement experiments indicate that 159
exchanging conserved photosynthetic proteins from multiprotein complexes can be 160
problematic given the highly integrated nature of the photosynthetic machinery Therefore 161
approaches designed to enhance photosynthesis such as introducing the high-light-resistant 162
D1 protein from a green alga that lives under extreme conditions (Treves et al 2016) into 163
crop plants do not appear promising Instead entire (sub)complexes with their internal 164
network of evolutionarily optimized interactions should be transferable between species 165
166
Exchange of non-conserved photosynthetic modules 167
Inspection of the repertoire of subunits of the photosynthetic machinery in the three model 168
species Synechocystis PCC6803 C reinhardtii and A thaliana which represent different 169
stages in the evolution of oxygen-generating photosynthesis shows that the most dramatic 170
changes in the photosynthetic proteome occurred during the transition from the 171
cyanobacterial endosymbiont (for which Synechocystis serves as a proxy) to the chloroplast 172
of unicellular algae (with C reinhardtii as proxy) (Fig 3 Supplemental Table 1) In 173
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particular phycobilisomes flavodoxin and several photosystem subunits were lost while 174
LHCs some novel photosystem subunits and several proteins involved in alternative electron 175
pathways or photoprotection evolved During the transition from algal chloroplasts to those 176
of flowering plants relatively few proteins were lost (eg flavodiiron proteins and the 177
canonical cytochrome c6) or acquired (Lhcb6CP24) (Fig 3 Supplemental Table 1) The 178
NAD(P)H dehydrogenase (NDH) complex involved in antimycin A-insensitive cyclic 179
electron flow (see Box 1) is a special case since the chloroplast NDH from flowering plants 180
traces back to the cyanobacterial complex but the complex was lost during evolution in C 181
reinhardtii (Fig 3 Supplemental Table 1) 182
Several attempts have been made to introduce photosynthetic proteins into species 183
that lack the corresponding homolog (Table 2) These heterologous expression approaches 184
have been successful for the soluble electron transporters flavodoxin cytochrome c6 and 185
flavodiiron proteins Indeed cyanobacterial flavodoxin can at least partially replace plant 186
ferredoxin and confer enhanced stress tolerance when expressed in addition to ferredoxin 187
(Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011) Similarly red algal 188
cytochrome c6 enhances growth and photosynthesis of A thaliana plants (Chida et al 2007) 189
Since A thaliana lacks a functional cytochrome c6 that can transfer electrons from the Cyt b6f 190
complex to PSI (Molina-Heredia et al 2003 Weigel et al 2003) it is plausible that the 191
more oxidized plastoquinone pool in the transgenic plants is a direct consequence of 192
additional PSI reduction mediated by the algal protein (Chida et al 2007) Interestingly it 193
seems to make no difference if an endogenous soluble electron transport protein (see Box 3) 194
or its heterologous equivalent from a distant species is overexpressed For instance 195
overexpression of the endogenous soluble proteins plastocyanin and ferredoxin can also 196
enhance growth in plants (Pesaresi et al 2009 Lin et al 2013 Chang et al 2017 Zhou et 197
al 2018) Interestingly and rather unexpectedly this concept can also work for certain 198
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proteins that are part of multiprotein complexes (Simkin et al 2017 see Box 3) This 199
indicates that the quantity of such proteins is relevant for growth enhancement and not its 200
evolutionary origin 201
More recently the two Physcomitrella patens flavodiiron protein (FLV) genes FlvA 202
and FlvB were introduced into A thaliana which like other angiosperms has lost FLVs 203
during evolution (Yamamoto et al 2016) FLVs are the main mediators of pseudo-cyclic 204
electron flow in photosynthetic organisms but heterologous expression of FLVs in A 205
thaliana had no effect on steady-state photosynthesis and growth of the transgenic plants 206
(Yamamoto et al 2016) However the Arabidopsis FLV lines displayed higher 207
photosynthetic yields just after the onset of actinic light following a long dark adaptation 208
suggesting that the FLVs mediated a large electron sink during the induction of 209
photosynthesis In fluctuating light experiments the Arabidopsis FLV lines had much less 210
PSI acceptor side limitation implying that the large FLV-mediated electron sink makes 211
photosynthesis more resistant to the fluctuating light Consequently this protective effect of 212
FLVs is more pronounced in Arabidopsis lines that are more sensitive to fluctuating light like 213
the pgr5 mutant defective in antimycin A-sensitive cyclic electron flow (see Box 1 Leister 214
and Shikanai 2013 Yamamoto et al 2016) Similarly expression of FLVs in a rice (Oryza 215
sativa) line with markedly reduced cyclic electron flow restored CO2 assimilation and growth 216
rate to wild-type levels (Wada et al 2018) Like FLVs LHcxLHCSR proteins play a role in 217
photoprotection in green algae and mosses but have been lost in angiosperms during 218
evolution Heterologous expression of P patens LHCSR1 in Nicotiana benthamiana and 219
Nicotiana tabacum yielded an active protein that has properties similar if not identical to 220
those of moss LHCSR1 (Pinnola et al 2015) 221
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Efforts to create LHCII complexes like those in plants by heterologously expressing 222
the membrane-spanning light-harvesting chlorophyll ab-binding protein Lhcb from Pisum 223
sp (pea) in Synechocystis were unsuccessful 224
Although the pea Lhcb protein was synthesized in Synechocystis and integrated into 225
the membrane it did not accumulate to steady-state levels detectable by immunoblot analysis 226
(He et al 1999) Possible explanations are that Lhcb is rapidly degraded either because its 227
ldquounfamiliarrdquo structure makes it a good substrate for the cyanobacterial proteolytic system or 228
it cannot foldassemble properly due to the lack of plant-specific pigments or assembly 229
factors Interestingly chlorophyll b production (see Box 2) after introduction of plant 230
chlorophyll a oxygenase (CAO) is boosted when Lhcb is expressed even though LHCII does 231
not accumulate in detectable amounts (Xu et al 2001) 232
Even soluble multiprotein complexes can be heterologously expressed as has been 233
impressively demonstrated from the carbon-fixation end of photosynthesis For example by 234
coexpression of five auxiliary factors a functional plant RuBisCo complex was successfully 235
assembled in Escherichia coli (Aigner et al 2017) This result is in line with the ldquofrozen 236
metabolic staterdquo concept showing that photosynthetic proteins embedded in a network of 237
interactions with other proteins and auxiliary factors can be introduced into distantly related 238
species but only with their own interaction networks While Gimpel et al (2016) showed that 239
efficient gene expression needs to be accounted for when designing synthetic modules for the 240
transfer of photosystem subunits from one species to another Aigner et al (2017) 241
demonstrated that auxiliary factors required for the biogenesis of photosynthetic 242
(sub)complexes need to be considered in such experiments adding additional facets to the 243
ldquofrozen metabolic staterdquo concept 244
Auxiliary factors required for the accumulation of photosynthetic multiprotein 245
complexes include (i) cofactors like iron-sulfur clusters and pigments (see Box 2) (ii) 246
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chaperones that are required for the insertion of co-factors (eg pigments into LHCs Schmid 247
2008) and (iii) assembly factors Assembly factors are required to support the stepwise 248
assembly and functionality of the multiproteinpigment complexes and many of these are 249
conserved between photosynthetic species (Nixon et al 2010 Nickelsen and Rengstl 2013 250
Jensen and Leister 2014) Therefore the exchange of entire multiprotein complexes between 251
distantly related species will not be simple due to the repertoire of auxiliary factors that has 252
markedly changed during evolution Since the species that Gimpel et al (2016) studied were 253
closely related this aspect could be neglected In consequence the impact of these auxiliary 254
factors on the formation of multiproteinpigment complexes will have to be fully elucidated 255
to understand which factors are sufficient to assemble a photosynthetic multiprotein complex 256
previous (genetic) approaches only identified factors required for this process Hence the 257
transfer of entire photosynthetic (sub)complexes between distantly related species by a 258
ldquosynthetic photosynthetic modulerdquo must include entire sets of strongly interacting proteins (to 259
address the ldquofrozen metabolic staterdquo) as well as all genetic elements and auxiliary factors 260
sufficient for efficient expression biogenesis and function of the proteins in the module 261
262
Bio-bio hybrids using photosynthesis as an electron source for unrelated biological 263
processes 264
The idea of using the reducing power of photosynthesis to drive unrelated metabolic reactions 265
has inspired several biotechnological concepts The photosynthesis-driven formation of 266
secondary metabolites has been demonstrated in vivo whereas light-driven generation of H2 267
by bio-bio hybrids so far works only in vitro and is closely related to bio-nano approaches 268
Therefore coupling of photosynthesis to previously unrelated pathways is discussed here 269
first followed by bio-bio systems for H2 generation 270
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Redirection of PSI reducing equivalents to drive reactions catalyzed by cytochrome 271
P450 enzymes has been achieved in vivo by genetic modifications of plants and 272
cyanobacteria (Lassen et al 2014a Nielsen et al 2016 Mellor et al 2017) Cytochrome 273
P450s constitute the largest family of plant enzymes that acts on various endogenous and 274
xenobiotic molecules (Rasool and Mohamed 2016) Their extreme versatility and 275
irreversibility of catalyzed reactions make these enzymes very attractive for use in 276
biotechnology medicine and phytoremediation P450s are monooxygenases that insert an 277
oxygen atom into hydrophobic molecules which enhances their reactivity and hydrophilicity 278
Most eukaryotic P450s require NADPHcytochrome P450 reductase as the electron donor 279
The ER membrane is generally accepted to be the primary subcellular repository of 280
eukaryotic P450s and their NADPHcytochrome P450 reductase By relocating cytochrome 281
P450s to the chloroplasts the reducing power of photosynthesis can be directly targeted to 282
the reactions catalyzed by these enzymes thus providing the basis for the large-scale 283
production of valuable products Initial attempts to couple P450s with photosynthesis were 284
conducted in vitro (Table 3 Fig 4A) Spinach chloroplasts were combined with microsomes 285
from yeast cells that had been stably transformed with a fusion gene expressing the rat 286
CYP1A1-NADPHcytochrome P450 reductase fusion enzyme (Kim et al 1996) These 287
experiments confirmed that it is feasible to drive P450-mediated reactions using electrons 288
derived from photosynthetically generated NADPH Intriguingly the NADPHcytochrome 289
P450 reductase is not always essential as demonstrated by co-incubating CYP79A1 from 290
sorghum (Sorghum bicolor) with barley (Hordeum vulgare) PSI and employing ferredoxin to 291
directly deliver electrons from PSI to the P450 (Jensen et al 2011) This approach was also 292
shown to be practicable in vivo CYP79A1 either alone or in combination with CYP71E1 293
and the UDP-glucosyltransferase UGT85B1 was first targeted in vivo to cyanobacterial or 294
plant thylakoid membranes where they catalyzed the same reactions as in their original 295
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13
cellular compartment (the ER) utilizing photosynthetically reduced ferredoxin as the electron 296
donor (Nielsen et al 2013 Lassen et al 2014b Gnanasekaran et al 2016 Wlodarczyk et 297
al 2016) Genetic fusions have also been employed for the coupling of P450s to PSI 298
CYP79A1 has been fused to either cyanobacterial PsaM or Arabidopsis ferredoxin and the 299
engineered enzyme showed light-driven activity both in vivo and in vitro (Lassen et al 300
2014b Mellor et al 2016) In the latter case the efficiency of the system was enhanced 301
because the fusion could compete better with endogenous electron sinks coupled to metabolic 302
pathways (Mellor et al 2016) 303
In contrast to PSI-P450 hybrids PSI-hydrogenase hybrids currently function only in 304
vitro Unlike fossil fuels H2 is environmentally benign as it produces only water when 305
combusted Therefore in principle harnessing of the reducing power of photosynthesis for 306
the direct production of H2 (ie ultimately using sunlight and water) would yield a fully 307
sustainable system of energy generation PSI but not PSII provides a standard midpoint 308
potential that is sufficiently negative to power the reduction of protons to H2 (Utschig et al 309
2015) Hence approaches have been developed to engineer PSI to produce H2 either as 310
replacement or in addition to its natural product NADPH (see Figure 1 in Box 1) by 311
redirecting PSI electrons to a catalytic component This catalytic component can be abiotic or 312
biotic (hydrogenases) The feasibility of coupling H2 generation to photosynthesis was 313
demonstrated 45 years ago by mixing chloroplast preparations with ferredoxin and 314
hydrogenase (Benemann et al 1973) Twenty-five years later hydrogen evolution by direct 315
electron transfer (without ferredoxin) from PSI to hydrogenases was accomplished for the 316
first time (McTavish 1998) 317
Hydrogenases catalyze the reversible interconversion of H2 into protons and electrons 318
and are widespread in nature they occur in bacteria and archaea but also in some eukarya In 319
vivo hydrogenases can mediate photosynthetic H2 production albeit mostly indirectly or 320
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14
under anaerobic conditions due to their oxygen sensitivity (Ghirardi 2015 Oey et al 2016) 321
Hydrogenases can be classified according to their metal-ion composition eg [NiFe] and 322
[FeFe] hydrogenases (Lubitz et al 2014 Martin and Frymier 2017) [FeFe] hydrogenases 323
preferentially catalyze proton reduction and can evolve H2 at high rates but are extremely 324
sensitive to O2 and are the only type of hydrogenases found in eukaryotic microorganisms 325
[NiFe] hydrogenases are less sensitive to O2 but preferentially oxidize H2 under 326
physiological conditions (Lubitz et al 2014) In vitro both types of hydrogenases have been 327
directly linked to PSI (Table 3 Fig 4B) PSI-[NiFe] hydrogenase complexes have been 328
generated by fusing the hydrogenase genetically to the PsaE protein (Ihara et al 2006a) PSI-329
[FeFe] hydrogenase complexes were obtained by genetically fusing the hydrogenase to 330
ferredoxin (Yacoby et al 2011) or covalently linking the FeS clusters present in the 331
hydrogenase to PSI via a molecular wire (Lubner et al 2010 Lubner et al 2011) 332
Two parameters characterize the efficiency of these in-vitro systems their H2 333
production rate and longevity While low rates of H2 production (in the range from 01 to 10 334
μmol H2mg chlorophyllh) were described for the early chloroplast extract experiments and 335
genetic fusions of PSI to [NiFe] or [FeFe] hydrogenases (McTavish 1998 Ihara et al 2006a 336
Yacoby et al 2011) higher rates of between 2000 and 3000 μmol H2mg chlorophyllh have 337
been achieved with wired PSI-[FeFe] hydrogenase complexes and genetically fused PSI-338
[NiFe] hydrogenase complexes assembled on a gold electrode (Krassen et al 2009 Lubner 339
et al 2011) Few data are available with respect to the longevity of the PSI-hydrogenase 340
systems however a minimum lifetime of 64 days was reported for a wired [FeFe] 341
hydrogenase-PSI complex at room temperature and under ambient illumination (Lubner et 342
al 2010) 343
The future use of hydrogenases in photosynthesis-driven H2 production will strongly 344
depend on whether or not it is possible to overcome the O2 sensitivity of many hydrogenases 345
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15
by for instance employing oxygen-tolerant [NiFe] hydrogenases (Burgdorf et al 2005 346
Schiffels et al 2013) If this is not possible their efficient use in vivo in thylakoids which 347
inevitably generate O2 during linear electron flow will be impossible However as 348
demonstrated with the gold surface system (Krassen et al 2009) the design of novel 349
matrices into which the hybrid system can be incorporated may markedly enhance the 350
efficiency 351
352
Bio-nano hybrids Use of photosynthesis as a source of electrons for non-biological 353
processes 354
From bio-bio hybrids it is only a small step to developing bio-nano hybrids as demonstrated 355
by PSI hybrids that employ abiotic catalysts for photosynthetic hydrogen production instead 356
of hydrogenase In fact abiotic catalysts have the advantage of bypassing the lability of 357
hydrogenases in the presence of oxygen PSI-platinum hybrids have been produced by 358
combining PSI with platinum nanoparticles (either directly or via tethering by nanowires) or 359
platinum nanoclusters (Kargul et al 2012 Fukuzumi 2015 Utschig et al 2015) (Fig 5A 360
Table 4) Current PSI-platinum hybrids are less efficient than the most advanced PSI-361
hydrogenase systems but are extremely robust (Utschig et al 2015) However future 362
widespread usage of the PSI-platinum system will be limited by the high cost of platinum A 363
more economical alternative to precious metals are earth-abundant molecular catalysts 364
However hybrids consisting of PSI and earth-abundant molecular catalysts have a much 365
shorter working life than platinum-based configurations (Utschig et al 2015) likely due to 366
instability of the molecular catalyst 367
PSI-based photocurrent-producing devices constitute another class of photosynthesis-368
derived nano-bio systems (Table 4 Fig 5) In such devices PSI is immobilized onto 369
electrodes Many variants of this concept have been tested such as varying the electrode 370
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16
materials immobilizationorientation strategies andor artificial redox mediators (Nguyen and 371
Bruce 2014 Janna Olmos and Kargul 2015 Plumereacute and Nowaczyk 2017 Kargul et al 372
2018) PSI must be immobilized on the electrode surface in such a way that electron transfers 373
between the electrodes and the oxidizing (P700) and reducing (FB - the terminal [4Fe-4S] 374
cluster or an intermediate electron transporter) sites of PSI can proceed with the required 375
efficiency Electrons are transferred between the electrodes and the oxidizing or reducing 376
sides of PSI either by a diffusible redox mediator or molecular wires Examples of electrode 377
materials and redox mediators are provided in Table 4 After P700 photo-excitation electrons 378
are transferred from P700 via several factors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB) to the 379
iron-sulfur cluster FB (see legend of Box 1) As in the case of PSI-hydrogenase and PSI-380
platinum nanoparticles PSI can be wired to its electrodes This has been achieved by wiring 381
the A1 cofactor (phylloquinone) to the substrate surface such that electrons are directly 382
transferred from A1 to the electrode thus bypassing the downstream FeS clusters (FX FA FB) 383
in the stromal domain of PSI (Terasaki et al 2007 Miyachi et al 2009 Terasaki et al 384
2009 Miyachi et al 2010) 385
Modifications of PSI have been utilized to enhance the efficiency of the photocurrent-386
generating system (Das et al 2004 Frolov et al 2005 Carmeli et al 2010) As mentioned 387
previously fusions to the stroma-faced PSI subunit PsaE can be used to link new components 388
to PSI however in this case PsaD fusions were used To this end recombinant His-tagged 389
PsaD was immobilized on the functionalized electrode surface which was then exposed to 390
native PSI complexes resulting in immobilized PSI with P700 facing away from the 391
electrode (Das et al 2004) Another way to control the orientation of PSI during 392
immobilization involves introducing cysteine mutations To allow for direct thiol coupling to 393
an Au surface various residues on the lumen-exposed face of PSI were replaced by cysteine 394
and tested (Frolov et al 2005) PSI attachment was achieved with all single mutants even 395
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17
those placed further from the P700 site suggesting that a specific location is not required as 396
long as the cysteine is exposed at the luminal surface of PSI The concept of targeted 397
attachment via introduced cysteine residues was exploited in subsequent studies to link PSI to 398
maleimide-functionalized gallium arsenide (Frolov et al 2008) to immobilize PSI between 399
the substrate and a metallized scanning near-field optical microscopy tip (Gerster et al 400
2012) and to bind PSI to carbon nanotubes (Kaniber et al 2010) Another modification of 401
PSI is represented by the attachment of plasmonic metal nanoparticles which resulted in 402
enhanced light absorption (Carmeli et al 2010) even in the green part of the solar spectrum 403
that is not normally absorbed (Szalkowski et al 2017) This suggests that it is possible to 404
enhance light absorption by PSI in vitro through the attachment of abiotic components that 405
act as optical antennae to extend the spectrum of photons available for P700 activation 406
Taken together these efforts demonstrate that PSI-based photocurrent-generating 407
systems are still in an exploratory phase with many variants under development In the next 408
phase viable building blocks and reference systems should be established that can serve as 409
starting points for the systematic engineering of superior systems This will require the 410
modification of PSI for optimal effect in artificial systems and will undoubtedly differ 411
substantially from the original environment in which PSI was molded by biological 412
evolution 413
414
Concluding remarks and outlook 415
Enhancing photosynthesis and growth can be achieved by a simple overexpression of certain 416
photosynthetic proteins and PSI can be coupled to previously unconnected biotic or abiotic 417
components to generate valuable compounds hydrogen or electricity Moreover entire 418
photosynthetic complexes can be functionally expressed in distantly related species (as 419
demonstrated for RuBisCO Aigner et al 2017) Thus what are the next goals and which 420
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18
challenges need to be overcome Two challenges for the in vivo systems are obvious (i) 421
enhancing the efficiency of in-vivo bio-bio hybrids and (ii) upscaling the size of ldquosynthetic 422
photosynthetic modulesrdquo to cover entire photosystems or complex antenna systems 423
With respect to the enhancement of in vivo cyanobacterial and algal systems 424
harboring hybrid configurations in which photosynthesis directly drives previously 425
unconnected pathways the use of laboratory evolution offers a unique opportunity to tailor 426
these systems for their intended purpose Laboratory evolution utilizes the high rate of 427
evolution typical in microbial systems (in particular if suitable selection conditions can be 428
designed) to fine tune and optimize processes through selection of advantageous genetic 429
variation While this strategy has been employed in E coli and yeast with impressive success 430
now photosynthetic microbial systems are emerging as attractive targets for this approach 431
(Leister 2017) 432
The exchange of entire multiprotein complexes between distantly related species will 433
not be a simple exercise because the ldquofrozen metabolic staterdquo of the core photosynthetic 434
complexes will necessitate the exchange of major parts of photosystems rather than 435
individual subunits The RuBisCO case study by Aigner et al (2017) represents of promising 436
proof of principle but one needs to consider that the synthetic RuBisCO module comprised 437
only the two different subunits present in the mature complex and five auxiliary factors for its 438
assembly Entire photosystems will require much larger ldquosynthetic photosynthetic modulesrdquo 439
and many of the auxiliary factors have not been identified yet Therefore when designing 440
these complex ldquosynthetic photosynthetic modulesrdquo we will identify the set of components 441
that are sufficient (and not only necessary) to drive photosynthesis providing an 442
unprecedentedly deep understanding of this fundamental and complex process 443
Given that the problems described above can be solved what will be the next steps in 444
the synthetic biology of the light reactions of photosynthesis The combination of ldquosynthetic 445
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19
photosynthetic modulesrdquo from diverse species could allow the design of novel variants of 446
photosynthesis Numerous instances of such ldquorecombined photosynthetic variantsrdquo can be 447
imagined including plants that employ cyanobacteria-derived phycobilisomes for highly 448
sufficient photosynthesis under low light conditions cyanobacteria that employ plant-derived 449
LHCs as antenna to shift light saturation of photosynthesis to higher intensities or the 450
integration of cyanobacterial Chl d and Chl f (which can absorb far-red and near infra-red 451
light) into algal or plant photosynthesis to expand the spectral region available to drive 452
photosynthesis (Loughlin et al 2013 Ho et al 2016) Moreover such variants of 453
recombined photosynthesis could be further optimized by laboratory evolution within a 454
suitable microbial chassis However such recombined photosynthetic variants cannot be 455
considered a truly novel type of photosynthesis because they would only bring preexisting 456
pieces together that evolution has separated Nevertheless they could be an important step 457
towards the ambitious goal to design truly novel ldquosynthetic photosynthetic modulesrdquo that 458
contain more efficient substitutes of the ldquofrozen metabolic accidentsrdquo discussed above 459
Ample proof of functionality for in-vivo hybrids (between photosynthesis and 460
previously unconnected metabolic pathways) and in-vitro hybrids (between PSI and biotic or 461
abiotic catalysts) has been obtained but such systems will only be commercially successful if 462
they can compete with established non-biological systems Tailoring of PSI in cyanobacteria 463
where techniques like gene replacement and gene modification are routine may contribute to 464
further improving the efficiency and robustness of in vitro and in vivo hybrids One 465
promising route could be to identify those parts of the original PSI (which evolved under 466
constraints imposed by the cyanobacterial cell) that are necessary for hybrid devices (a 467
ldquominimalrdquo PSI) Such bio-nano systems can be optimized to include novel non-biological 468
components that replace or complement natural pigments andor the protein-based backbone 469
of photosystems going far beyond the limited toolbox of Naturersquos chemistry Such novel 470
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20
systems inspired by natural photosynthesis could be used to engage biologists in the design 471
of fundamentally different types of photosynthesis in living organisms 472
473
SUPPLEMENTAL DATA 474
Supplemental Table 1 Absencepresence of photosynthetic proteins in the three model 475
species Synechocystis PCC6803 (Syn) Chlamydomonas reinhardtii (Cr) and Arabidopsis 476
thaliana (At) 477
478
ACKNOWLEDGMENTS 479
The authors thank Paul Hardy for critical reading of the manuscript 480
481
482
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21
Table 1 Replacement of conserved individual or multiple photosynthetic proteins 483
GeneProtein Description Protein
identity
Reference
psbAD1 Synechocystis D1 was replaced by its homolog from
Poa annua which resulted in slower growth This is
likely to be due to increased charge recombination
between the donor and acceptor sides of the reaction
center
86 Nixon et al
1991
psbBCP47 Synechocystis CP47 was replaced by its homolog
from spinach and photoautotrophy was lost
80 Vermaas et
al 1996
psbCCP43 Synechocystis CP43 was replaced by its homolog
from spinach and photoautotrophy was lost
85 Carpenter et
al 1993
psbHPsbH Synechocystis PsbH was replaced by its counterpart
from maize The resulting strain displayed increased
light sensitivity and lower chlorophyll content
78 Chiaramonte
et al 1999
psaAPsaA Synechocystis PsaA was replaced by its equivalent
from A thaliana This resulted in reduced photo-
autotrophical growth and a drastically reduced
ChlPC ratio
80 Viola et al
2014
psbABCDEF
D1CP47CP43D2
Cyt b559-+
All six core subunits of C reinhardtii were replaced
by their counterparts from two different green algae
(V carteri and S obliquus) The resulting strains
were photoautotrophic but showed reduced
photosynthetic efficiency and the heterologous
82 -
99
Gimpel et al
2016
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22
proteins reached only between 10 and 20 of the
levels of those they replaced
484
485
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23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
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24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
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25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
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26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
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28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
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32
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566
Aigner H Wilson RH Bracher A Calisse L Bhat JY Hartl FU Hayer-Hartl M (2017) 567
Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
chloroplast-ferredoxin-hydrogenase system Proc Natl Acad Sci U S A 70 2317-2320 571
Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
complements ferredoxin deficiency in knocked-down transgenic tobacco plants Plant 574
J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
photosynthesis for energy production Curr Opin Chem Biol 17 457-461 577
Burgdorf T Lenz O Buhrke T van der Linden E Jones AK Albracht SP Friedrich B 578
(2005) [NiFe]-hydrogenases of Ralstonia eutropha H16 modular enzymes for 579
oxygen-tolerant biological hydrogen oxidation J Mol Microbiol Biotechnol 10 181-580
96 581
Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
(2010) Broad band enhancement of light absorption in photosystem I by metal 583
nanoparticle antennas Nano Lett 10 2069-2074 584
Carpenter SD Ohad I Vermaas WF (1993) Analysis of chimeric spinachcyanobacterial 585
CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
the water-splitting system of Photosystem II Biochim Biophys Acta 1144 204-212 587
Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
Eur J Biochem 260 833-843 593
Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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33
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(2017) Bioelectronic Circuit on a 3D Electrode Architecture Enzymatic Catalysis 599
Interconnected with Photosystem I J Am Chem Soc 139 16478-16481 600
Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel 601
genetic diversity Philos Trans R Soc Lond B Biol Sci 372 602
Das R Kiley PJ Segal M Norville J Yu AA Wang L Trammell SA Reddick LE 603
Kumar R Stellacci F Lebedev N Schnur J Bruce BD Zhang S Baldo M (2004) 604
Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
by thermal dissipation of excess energy Biochem Soc Trans 38 651-660 608
Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
device by direct chemical binding of the photosynthetic reaction center protein to 610
metal surfaces Advanced Materials 17 2434-2437 611
Frolov L Rosenwaks Y Richter S Carmeli C Carmeli I (2008) Photoelectric junctions 612
between GaAs and photosynthetic reaction center protein J Phys Chem C 112 613
13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I 617
Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
reinhardtii ACS Synth Biol 5 589-596 624
Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
state biophotovoltaic cells containing photosystem I Adv Mater 26 4863-4869 630
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34
Glowacka K Kromdijk J Kucera K Xie J Cavanagh AP Leonelli L Leakey ADB Ort 631
DR Niyogi KK Long SP (2018) Photosystem II subunit S overexpression increases 632
the efficiency of water use in a field-grown crop Nat Commun 9 868 633
Gnanasekaran T Karcher D Nielsen AZ Martens HJ Ruf S Kroop X Olsen CE 634
Motawie MS Pribil M Moller BL Bock R Jensen PE (2016) Transfer of the 635
cytochrome P450-dependent dhurrin pathway from Sorghum bicolor into Nicotiana 636
tabacum chloroplasts for light-driven synthesis J Exp Bot 67 2495-2506 637
Haniewicz P Abram M Nosek L Kirkpatrick J El-Mohsnawy E Olmos JDJ Kouřil 638
R Kargul JM (2018) Molecular mechanisms of photoadaptation of photosystem I 639
supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
harvesting chlorophyll ab-binding protein in Synechocystis sp PCC 6803 Eur J 643
Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
synthase is a highly divergent paralog of PsbA of photosystem II Science 353 646
Holt NE Fleming GR Niyogi KK (2004) Toward an understanding of the mechanism of 647
nonphotochemical quenching in green plants Biochemistry 43 8281-8289 648
Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
D Kamachi T Okura I (2006a) Light-driven hydrogen production by a hybrid 650
complex of a [NiFe]-hydrogenase and the cyanobacterial photosystem I Photochem 651
Photobiol 82 676-682 652
Ihara M Nakamoto H Kamachi T Okura I Maeda M (2006b) Photoinduced hydrogen 653
production by direct electron transfer from photosystem I cross-linked with 654
cytochrome c3 to [NiFe]-hydrogenase Photochem Photobiol 82 1677-1685Janna 655
Olmos JD Kargul J (2015) A quest for the artificial leaf Int J Biochem Cell Biol 656
66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
Pawlak D Kargul J (2017) Biofunctionalisation of p-doped silicon with cytochrome 659
c553 minimises charge recombination and enhances photovoltaic performance of the 660
all-solid-state photosystem I-based biophotoelectrode RSC Adv 7 47854-47866 661
Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations 662
ACS Chem Biol 6 533-539 663
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35
Jensen PE Leister D (2014) Chloroplast evolution structure and functions F1000Prime 664
Rep 6 40 665
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip 666
functionalization of carbon nanotubes with photosystem I J Am Chem Soc 132 667
2872-2873 668
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and 669
its application in biomimetic solar-to-fuel systems J Plant Physiol 169 1639-1653 670
Kargul J Bubak G Andryianau G (2018) Biophotovoltaic systems based on 671
photosynthetic complexes In Wandelt K (Ed) Encyclopedia of Interfacial 672
Chemistry Surface Science and Electrochemistry vol 7 pp 43-63 673
Kim YS Hara M Ikebukuro K Miyake J Ohkawa H Karube I (1996) Photo-induced 674
activation of cytochrome P450reductase fusion enzyme coupled with spinach 675
chloroplasts Biotechnol Tech 10 717minus720 676
Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic 677
hydrogen production by a hybrid complex of photosystem I and [NiFe]-hydrogenase 678
ACS Nano 3 4055-4061 679
Kromdijk J Glowacka K Leonelli L Gabilly ST Iwai M Niyogi KK Long SP (2016) 680
Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
Kubota H Sakurai I Katayama K Mizusawa N Ohashi S Kobayashi M Zhang P Aro 683
EM Wada H (2010) Purification and characterization of photosystem I complex 684
from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim 685
Biophys Acta 1797 98-105 686
Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future 702
by engineering crop photosynthesis and yield potential Cell 161 56-66 703
Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
(2011) Solar hydrogen-producing bionanodevice outperforms natural photosynthesis 709
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Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
production Biochemistry 49 10264-10266 713
Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
organisms using whole-cell and cell-free systems Appl Biochem Biotechnol 183 715
503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
hydrogenases J Biochem 123 644-649 718
Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
(2016) Fusion of ferredoxin and cytochrome P450 enables direct light-driven 720
biosynthesis ACS Chem Biol 11 1862-1869 721
Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous 722
enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
Y Nishihara H (2010) A photosensing system composed of photosystem I 725
molecular wire gold nanoparticle and double surfactants in water Chem Commun 726
(Camb) 46 2557-2559 727
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
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37
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Mullineaux CW Emlyn-Jones D (2005) State transitions an example of acclimation to 733
low-light stress J Exp Bot 56 389-393 734
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J 735
Nanosci Nanotechnol 9 1709-1713 736
Nguyen K Bruce BD (2014) Growing green electricity progress and strategies for use of 737
photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello 742
Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in 748
understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in 750
Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
complex Plant Cell 3 383-395 752
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
S Cazzaniga S Bassi R (2015) Heterologous expression of moss light-harvesting 764
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38
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24340-24354 767
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins 768
Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
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Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
natural product biosynthesis Protoplasma 253 1197-1209 774
Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS 775
Lett 581 2768-2775 776
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3619-3639 782
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2189 785
Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS 786
Protein Increases Electron Transport Rates and Biomass Yield Plant Physiol 175 787
134-145 788
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Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
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Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M 800
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Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N 803
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tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050 805
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
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Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M 810
Norici A Shotland Y Ohad I Kaplan A (2016) The mechanisms whereby the 811
green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled 812
photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
Photosystem I-catalyst hybrids Curr Opin Chem Biol 25 1-8 815
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Synechocystis sp PCC 6803 carrying spinach sequences Construction and function 817
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Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
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Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
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40
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843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
2
1 This work was funded by the Deutsche Forschungsgemeinschaft (DFG TRR 175 and GRK 26
2062) 27
28
Address correspondence to leisterlmude 29
ORCID IDs 0000-0003-1897-8421 (DL) 30
31
Oxygenic photosynthesis is imperfect and the evolutionarily conditioned patchwork nature of 32
the light reactions in plants provides ample scope for their improvement (Leister 2012 33
Blankenship and Chen 2013) In fact only around 40 of the incident solar energy is used 34
for photosynthesis Two obvious ways of reducing energy loss are to expand the spectral 35
band used for photosynthesis and to shift saturation of the process to higher light intensities 36
Indeed even minor enhancements to the efficiency or stress resistance of the light reactions 37
of photosynthesis should have a positive impact on biomass production and yield (Leister 38
2012 Blankenship and Chen 2013 Long et al 2015) 39
However modifications to the essential structure of the light reactions of plant 40
photosynthesis are currently limited by two main factors One is the high degree of 41
conservation of their structural components which limits the efficiency gains attainable by 42
conventional breeding approaches (Dann and Leister 2017) The second is that the 43
organization of these structural components into multiprotein complexes requires the 44
simultaneous tailoring of several proteins some of them encoded by different genetic systems 45
in different subcellular compartments (nucleus and chloroplasts) in land plants Therefore 46
successful modification of the light reactions of plant photosynthesis has been limited to a 47
few cases Similarly modification of the activity of auxiliary proteins involved in the 48
regulation of the light reactions to enhance plant growth and yield has only recently resulted 49
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
3
in successful outcomes and is limited to a small subset of regulatory proteins (Pribil et al 50
2010 Kromdijk et al 2016 Glowacka et al 2018) 51
In addition to enhancing the light reactions for improved biomass production and 52
yield concepts have been developed for the direct coupling of photosynthesis to other 53
important pathways that are indirectly connected to photosynthesis in natural systems for 54
instance because they reside in different subcellular compartments (Lassen et al 2014a) 55
Direct coupling would be expected to boost the production of rare compounds in cells and 56
contribute to the biotechnological production of high-value compounds in vivo 57
In vitro it is possible to functionally link components of photosynthesis with entirely 58
unrelated biotic or abiotic catalysts or with abiotic electrode materials In fact Photosystem I 59
(PSI) is naturally adapted for highly efficient light harvesting and charge separation (Kargul 60
et al 2012 Nguyen and Bruce 2014 Martin and Frymier 2017) and has been described as 61
the most efficient natural nano-photochemical machine (Nelson 2009) Upon light excitation 62
PSI produces the most powerful naturally occurring reducing agent ndash P700 ndash which 63
together with an exceptionally long-lived charge-separated state provides sufficient driving 64
force to reduce protons to H2 at neutral pH PSI operates with a quantum yield close to 10 65
and currently no synthetic system has approached its remarkable efficiency Moreover PSI 66
preparations are generally robust especially those obtained from extremophilic microalgae 67
(Kubota et al 2010 Haniewicz et al 2018) The superior qualities of PSI have stimulated 68
strategies designed to generate in vitro hybrids of PSI and various types of redox-active 69
catalysts or other materials 70
In sum the light reactions of photosynthesis are a prime target for genetic engineering 71
and synthetic biology approaches for three major reasons (1) Enhancement of the process in 72
vivo to increase the efficiency of light use promises to increase biomass and crop yields (2) 73
Coupling of the light reactions of photosynthesis to previously unconnected pathways will 74
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4
enable us to utilize the reducing power of the light reactions directly to produce large 75
amounts of high-value compounds in vivo (3) The high efficiency and robustness of PSI 76
should allow it to be used in hybrids with biotic or abiotic components to generate hydrogen 77
simple carbon-based solar fuels or electricity in vitro In this review the background to and 78
recent developments in these three strategies are discussed 79
80
Natural building blocks of photosynthesis 81
During photosynthesis carbon dioxide (CO2) is converted into organic compounds 82
principally sugars using sunlight as energy In plants algae and cyanobacteria 83
photosynthesis uses water as the electron donor for chemical reduction of CO2 and releases 84
oxygen Algae and plants derive from a lineage that arose from an endosymbiotic relationship 85
between a protist and a cyanobacterium Chloroplasts the photosynthetic organelles in 86
modern plants are in fact the descendants of this ancient symbiotic cyanobacterium and 87
possess an internal membrane system that resembles the thylakoid membranes of modern-day 88
cyanobacteria Indeed during the evolutionary transition from cyanobacteria to chloroplasts 89
the overall organization and mode of action of the photosynthetic machinery was retained 90
(Box 1) However significant changes have occurred in the subunit composition of 91
photosystems (Fig 1) their posttranslational modification (Pesaresi et al 2011) the 92
harvesting of light energy pigment composition and regulation of photosynthesis (Box 93
2)(Mullineaux and Emlyn-Jones 2005 Rochaix 2007 Holt et al 2004 de Bianchi et al 94
2010) 95
Its evolutionary history makes photosynthesis well-suited for synthetic biology 96
strategies The evolutionary diversification of the photosynthetic machinery has provided a 97
set of building blocks ranging from single proteins such as the soluble electron transporters 98
(plastocyanin cytochrome c6 flavodoxin and ferredoxin) to multiprotein complexes like 99
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5
photosystems and antenna complexes (phycobiliosomes and light-harvesting complexes 100
(LHCs)) In principle the building blocks should be interchangeable between cyanobacteria 101
algae and plants Instances of the swapping of homologous photosynthetic proteins between 102
species by means of genetic engineering are discussed in the next section to highlight the 103
complications associated with apparently straightforward approaches The focus then shifts to 104
genuinely synthetic approaches in which specific photosynthetic building blocks have been 105
introduced into photosynthetic species that lack them In the subsequent two sections the 106
combination of non-photosynthetic (Bio-bio hybrids using photosynthesis as an electron 107
source for unrelated biological processes) and non-biological building blocks (Bio-nano 108
hybrids using photosynthesis as an electron source for non-biological processes) with 109
components of the photosynthetic machinery are described An overview of these approaches 110
is provided in Figure 2 111
112
Exchange of conserved photosynthetic modules 113
Theoretically it should be relatively easy to exchange individual conserved photosynthetic 114
proteins between different species even in such distantly related organisms as cyanobacteria 115
and plants However in practice these simple genetic engineering exercises can be 116
problematic (Table 1) Several individual proteins from cyanobacterial PSII (D1 CP43 and 117
PsbH) and PSI (PsaA) have indeed been genetically replaced by their plant counterparts with 118
varying success Synechocystis strains expressing the D1 protein from Poa annua or PsbH 119
from maize (Zea mays) could still perform photosynthesis ndash albeit with less efficiency than 120
the WT strain (Nixon et al 1991 Chiaramonte et al 1999) ndash but replacement of 121
Synechocystis CP43 or CP47 by their homologs from spinach (Spinacia oleracea) was 122
incompatible with photoautotrophy (Carpenter et al 1993 Vermaas et al 1996) Similarly 123
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6
in Synechocystis strains equipped with Arabidopsis thaliana PsaA PSI function was severely 124
disrupted (Viola et al 2014) 125
Such complications resulting from the replacement of core subunits of photosystems 126
despite their high similarity (78ndash86 identity between the cyanobacterial and plant proteins 127
Table 1) reflect the so-called ldquofrozen metabolic staterdquo of the photosynthetic multiprotein 128
complexes This term was coined by Gimpel et al (2016) but was originally introduced as 129
ldquofrozen metabolic accidentrdquo by Shi et al (2005) The ldquofrozen metabolic accidentrdquo concept 130
refers to the observation that selection has not significantly altered biophysically and 131
physiologically inefficient photosynthetic proteins (including the D1 protein of PSII or 132
RuBisCO of the Calvin-Benson cycle) over billions of years of evolution In fact 133
bioinformatic analysis of photosynthetic cyanobacterial genes suggests that the evolution rate 134
of proteins at the core of the photosynthetic apparatus is highly constrained by protein-135
protein protein-lipid and protein-cofactor interactions (Shi et al 2005) This provides an 136
internal selection pressure conserving the sequence of proteins in photosynthetic 137
multiprotein complexes and ndash in case of prokaryotes ndash also the genomic organization of their 138
genes (Shi et al 2005) The term ldquofrozen metabolic accidentrdquo was generalized to ldquofrozen 139
metabolic staterdquo by Gimpel et al (2016) and implies that in each photosynthetic species 140
slightly distinct modules of the cores of photosynthetic multiprotein complexes have evolved 141
that are optimized with respect to their intrinsic interactions and that rarely tolerate the 142
alteration of single proteins by exchange or mutation In consequence the simultaneous 143
exchange of entire sets of core proteins (or ldquomodulesrdquo) with all their intrinsic interactions 144
should be more feasible than substituting individual proteins that may disrupt the ldquofrozen 145
metabolic staterdquo Such an experiment has been performed in the green alga Chlamydomonas 146
reinhardtii where the six PSII core proteins D1 CP47 CP43 D2 Cyt b559- and were 147
swapped for their homologs from two other green algal species (Gimpel et al 2016) 148
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7
Photoautotrophy was not affected by the exchange of this synthetic biology module although 149
the fully altered strains performed suboptimally compared to strains in which only 1ndash5 genes 150
were exchanged However in control experiments where the synthetic C reinhardtii six-gene 151
module was re-introduced to the C reinhardtii deletion strain that lacked all six genes only 152
about 86 of wild-type PSII functionality was rescued Tentative explanations for this 153
decreased efficiency include (i) off-target effects of the PSII gene deletions on the operon 154
components and tRNA genes associated with these PSII loci (ii) misregulation of the 155
transferred PSII genes because their expression cassettes lacked unidentified cis-acting DNA 156
elements and (iii) perturbation of polycistron-dependent post-transcriptional regulation of the 157
transformed genes since they were no longer part of an operon (Gimpel et al 2016) 158
Taken together the outcomes of these replacement experiments indicate that 159
exchanging conserved photosynthetic proteins from multiprotein complexes can be 160
problematic given the highly integrated nature of the photosynthetic machinery Therefore 161
approaches designed to enhance photosynthesis such as introducing the high-light-resistant 162
D1 protein from a green alga that lives under extreme conditions (Treves et al 2016) into 163
crop plants do not appear promising Instead entire (sub)complexes with their internal 164
network of evolutionarily optimized interactions should be transferable between species 165
166
Exchange of non-conserved photosynthetic modules 167
Inspection of the repertoire of subunits of the photosynthetic machinery in the three model 168
species Synechocystis PCC6803 C reinhardtii and A thaliana which represent different 169
stages in the evolution of oxygen-generating photosynthesis shows that the most dramatic 170
changes in the photosynthetic proteome occurred during the transition from the 171
cyanobacterial endosymbiont (for which Synechocystis serves as a proxy) to the chloroplast 172
of unicellular algae (with C reinhardtii as proxy) (Fig 3 Supplemental Table 1) In 173
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8
particular phycobilisomes flavodoxin and several photosystem subunits were lost while 174
LHCs some novel photosystem subunits and several proteins involved in alternative electron 175
pathways or photoprotection evolved During the transition from algal chloroplasts to those 176
of flowering plants relatively few proteins were lost (eg flavodiiron proteins and the 177
canonical cytochrome c6) or acquired (Lhcb6CP24) (Fig 3 Supplemental Table 1) The 178
NAD(P)H dehydrogenase (NDH) complex involved in antimycin A-insensitive cyclic 179
electron flow (see Box 1) is a special case since the chloroplast NDH from flowering plants 180
traces back to the cyanobacterial complex but the complex was lost during evolution in C 181
reinhardtii (Fig 3 Supplemental Table 1) 182
Several attempts have been made to introduce photosynthetic proteins into species 183
that lack the corresponding homolog (Table 2) These heterologous expression approaches 184
have been successful for the soluble electron transporters flavodoxin cytochrome c6 and 185
flavodiiron proteins Indeed cyanobacterial flavodoxin can at least partially replace plant 186
ferredoxin and confer enhanced stress tolerance when expressed in addition to ferredoxin 187
(Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011) Similarly red algal 188
cytochrome c6 enhances growth and photosynthesis of A thaliana plants (Chida et al 2007) 189
Since A thaliana lacks a functional cytochrome c6 that can transfer electrons from the Cyt b6f 190
complex to PSI (Molina-Heredia et al 2003 Weigel et al 2003) it is plausible that the 191
more oxidized plastoquinone pool in the transgenic plants is a direct consequence of 192
additional PSI reduction mediated by the algal protein (Chida et al 2007) Interestingly it 193
seems to make no difference if an endogenous soluble electron transport protein (see Box 3) 194
or its heterologous equivalent from a distant species is overexpressed For instance 195
overexpression of the endogenous soluble proteins plastocyanin and ferredoxin can also 196
enhance growth in plants (Pesaresi et al 2009 Lin et al 2013 Chang et al 2017 Zhou et 197
al 2018) Interestingly and rather unexpectedly this concept can also work for certain 198
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9
proteins that are part of multiprotein complexes (Simkin et al 2017 see Box 3) This 199
indicates that the quantity of such proteins is relevant for growth enhancement and not its 200
evolutionary origin 201
More recently the two Physcomitrella patens flavodiiron protein (FLV) genes FlvA 202
and FlvB were introduced into A thaliana which like other angiosperms has lost FLVs 203
during evolution (Yamamoto et al 2016) FLVs are the main mediators of pseudo-cyclic 204
electron flow in photosynthetic organisms but heterologous expression of FLVs in A 205
thaliana had no effect on steady-state photosynthesis and growth of the transgenic plants 206
(Yamamoto et al 2016) However the Arabidopsis FLV lines displayed higher 207
photosynthetic yields just after the onset of actinic light following a long dark adaptation 208
suggesting that the FLVs mediated a large electron sink during the induction of 209
photosynthesis In fluctuating light experiments the Arabidopsis FLV lines had much less 210
PSI acceptor side limitation implying that the large FLV-mediated electron sink makes 211
photosynthesis more resistant to the fluctuating light Consequently this protective effect of 212
FLVs is more pronounced in Arabidopsis lines that are more sensitive to fluctuating light like 213
the pgr5 mutant defective in antimycin A-sensitive cyclic electron flow (see Box 1 Leister 214
and Shikanai 2013 Yamamoto et al 2016) Similarly expression of FLVs in a rice (Oryza 215
sativa) line with markedly reduced cyclic electron flow restored CO2 assimilation and growth 216
rate to wild-type levels (Wada et al 2018) Like FLVs LHcxLHCSR proteins play a role in 217
photoprotection in green algae and mosses but have been lost in angiosperms during 218
evolution Heterologous expression of P patens LHCSR1 in Nicotiana benthamiana and 219
Nicotiana tabacum yielded an active protein that has properties similar if not identical to 220
those of moss LHCSR1 (Pinnola et al 2015) 221
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10
Efforts to create LHCII complexes like those in plants by heterologously expressing 222
the membrane-spanning light-harvesting chlorophyll ab-binding protein Lhcb from Pisum 223
sp (pea) in Synechocystis were unsuccessful 224
Although the pea Lhcb protein was synthesized in Synechocystis and integrated into 225
the membrane it did not accumulate to steady-state levels detectable by immunoblot analysis 226
(He et al 1999) Possible explanations are that Lhcb is rapidly degraded either because its 227
ldquounfamiliarrdquo structure makes it a good substrate for the cyanobacterial proteolytic system or 228
it cannot foldassemble properly due to the lack of plant-specific pigments or assembly 229
factors Interestingly chlorophyll b production (see Box 2) after introduction of plant 230
chlorophyll a oxygenase (CAO) is boosted when Lhcb is expressed even though LHCII does 231
not accumulate in detectable amounts (Xu et al 2001) 232
Even soluble multiprotein complexes can be heterologously expressed as has been 233
impressively demonstrated from the carbon-fixation end of photosynthesis For example by 234
coexpression of five auxiliary factors a functional plant RuBisCo complex was successfully 235
assembled in Escherichia coli (Aigner et al 2017) This result is in line with the ldquofrozen 236
metabolic staterdquo concept showing that photosynthetic proteins embedded in a network of 237
interactions with other proteins and auxiliary factors can be introduced into distantly related 238
species but only with their own interaction networks While Gimpel et al (2016) showed that 239
efficient gene expression needs to be accounted for when designing synthetic modules for the 240
transfer of photosystem subunits from one species to another Aigner et al (2017) 241
demonstrated that auxiliary factors required for the biogenesis of photosynthetic 242
(sub)complexes need to be considered in such experiments adding additional facets to the 243
ldquofrozen metabolic staterdquo concept 244
Auxiliary factors required for the accumulation of photosynthetic multiprotein 245
complexes include (i) cofactors like iron-sulfur clusters and pigments (see Box 2) (ii) 246
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11
chaperones that are required for the insertion of co-factors (eg pigments into LHCs Schmid 247
2008) and (iii) assembly factors Assembly factors are required to support the stepwise 248
assembly and functionality of the multiproteinpigment complexes and many of these are 249
conserved between photosynthetic species (Nixon et al 2010 Nickelsen and Rengstl 2013 250
Jensen and Leister 2014) Therefore the exchange of entire multiprotein complexes between 251
distantly related species will not be simple due to the repertoire of auxiliary factors that has 252
markedly changed during evolution Since the species that Gimpel et al (2016) studied were 253
closely related this aspect could be neglected In consequence the impact of these auxiliary 254
factors on the formation of multiproteinpigment complexes will have to be fully elucidated 255
to understand which factors are sufficient to assemble a photosynthetic multiprotein complex 256
previous (genetic) approaches only identified factors required for this process Hence the 257
transfer of entire photosynthetic (sub)complexes between distantly related species by a 258
ldquosynthetic photosynthetic modulerdquo must include entire sets of strongly interacting proteins (to 259
address the ldquofrozen metabolic staterdquo) as well as all genetic elements and auxiliary factors 260
sufficient for efficient expression biogenesis and function of the proteins in the module 261
262
Bio-bio hybrids using photosynthesis as an electron source for unrelated biological 263
processes 264
The idea of using the reducing power of photosynthesis to drive unrelated metabolic reactions 265
has inspired several biotechnological concepts The photosynthesis-driven formation of 266
secondary metabolites has been demonstrated in vivo whereas light-driven generation of H2 267
by bio-bio hybrids so far works only in vitro and is closely related to bio-nano approaches 268
Therefore coupling of photosynthesis to previously unrelated pathways is discussed here 269
first followed by bio-bio systems for H2 generation 270
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12
Redirection of PSI reducing equivalents to drive reactions catalyzed by cytochrome 271
P450 enzymes has been achieved in vivo by genetic modifications of plants and 272
cyanobacteria (Lassen et al 2014a Nielsen et al 2016 Mellor et al 2017) Cytochrome 273
P450s constitute the largest family of plant enzymes that acts on various endogenous and 274
xenobiotic molecules (Rasool and Mohamed 2016) Their extreme versatility and 275
irreversibility of catalyzed reactions make these enzymes very attractive for use in 276
biotechnology medicine and phytoremediation P450s are monooxygenases that insert an 277
oxygen atom into hydrophobic molecules which enhances their reactivity and hydrophilicity 278
Most eukaryotic P450s require NADPHcytochrome P450 reductase as the electron donor 279
The ER membrane is generally accepted to be the primary subcellular repository of 280
eukaryotic P450s and their NADPHcytochrome P450 reductase By relocating cytochrome 281
P450s to the chloroplasts the reducing power of photosynthesis can be directly targeted to 282
the reactions catalyzed by these enzymes thus providing the basis for the large-scale 283
production of valuable products Initial attempts to couple P450s with photosynthesis were 284
conducted in vitro (Table 3 Fig 4A) Spinach chloroplasts were combined with microsomes 285
from yeast cells that had been stably transformed with a fusion gene expressing the rat 286
CYP1A1-NADPHcytochrome P450 reductase fusion enzyme (Kim et al 1996) These 287
experiments confirmed that it is feasible to drive P450-mediated reactions using electrons 288
derived from photosynthetically generated NADPH Intriguingly the NADPHcytochrome 289
P450 reductase is not always essential as demonstrated by co-incubating CYP79A1 from 290
sorghum (Sorghum bicolor) with barley (Hordeum vulgare) PSI and employing ferredoxin to 291
directly deliver electrons from PSI to the P450 (Jensen et al 2011) This approach was also 292
shown to be practicable in vivo CYP79A1 either alone or in combination with CYP71E1 293
and the UDP-glucosyltransferase UGT85B1 was first targeted in vivo to cyanobacterial or 294
plant thylakoid membranes where they catalyzed the same reactions as in their original 295
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13
cellular compartment (the ER) utilizing photosynthetically reduced ferredoxin as the electron 296
donor (Nielsen et al 2013 Lassen et al 2014b Gnanasekaran et al 2016 Wlodarczyk et 297
al 2016) Genetic fusions have also been employed for the coupling of P450s to PSI 298
CYP79A1 has been fused to either cyanobacterial PsaM or Arabidopsis ferredoxin and the 299
engineered enzyme showed light-driven activity both in vivo and in vitro (Lassen et al 300
2014b Mellor et al 2016) In the latter case the efficiency of the system was enhanced 301
because the fusion could compete better with endogenous electron sinks coupled to metabolic 302
pathways (Mellor et al 2016) 303
In contrast to PSI-P450 hybrids PSI-hydrogenase hybrids currently function only in 304
vitro Unlike fossil fuels H2 is environmentally benign as it produces only water when 305
combusted Therefore in principle harnessing of the reducing power of photosynthesis for 306
the direct production of H2 (ie ultimately using sunlight and water) would yield a fully 307
sustainable system of energy generation PSI but not PSII provides a standard midpoint 308
potential that is sufficiently negative to power the reduction of protons to H2 (Utschig et al 309
2015) Hence approaches have been developed to engineer PSI to produce H2 either as 310
replacement or in addition to its natural product NADPH (see Figure 1 in Box 1) by 311
redirecting PSI electrons to a catalytic component This catalytic component can be abiotic or 312
biotic (hydrogenases) The feasibility of coupling H2 generation to photosynthesis was 313
demonstrated 45 years ago by mixing chloroplast preparations with ferredoxin and 314
hydrogenase (Benemann et al 1973) Twenty-five years later hydrogen evolution by direct 315
electron transfer (without ferredoxin) from PSI to hydrogenases was accomplished for the 316
first time (McTavish 1998) 317
Hydrogenases catalyze the reversible interconversion of H2 into protons and electrons 318
and are widespread in nature they occur in bacteria and archaea but also in some eukarya In 319
vivo hydrogenases can mediate photosynthetic H2 production albeit mostly indirectly or 320
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14
under anaerobic conditions due to their oxygen sensitivity (Ghirardi 2015 Oey et al 2016) 321
Hydrogenases can be classified according to their metal-ion composition eg [NiFe] and 322
[FeFe] hydrogenases (Lubitz et al 2014 Martin and Frymier 2017) [FeFe] hydrogenases 323
preferentially catalyze proton reduction and can evolve H2 at high rates but are extremely 324
sensitive to O2 and are the only type of hydrogenases found in eukaryotic microorganisms 325
[NiFe] hydrogenases are less sensitive to O2 but preferentially oxidize H2 under 326
physiological conditions (Lubitz et al 2014) In vitro both types of hydrogenases have been 327
directly linked to PSI (Table 3 Fig 4B) PSI-[NiFe] hydrogenase complexes have been 328
generated by fusing the hydrogenase genetically to the PsaE protein (Ihara et al 2006a) PSI-329
[FeFe] hydrogenase complexes were obtained by genetically fusing the hydrogenase to 330
ferredoxin (Yacoby et al 2011) or covalently linking the FeS clusters present in the 331
hydrogenase to PSI via a molecular wire (Lubner et al 2010 Lubner et al 2011) 332
Two parameters characterize the efficiency of these in-vitro systems their H2 333
production rate and longevity While low rates of H2 production (in the range from 01 to 10 334
μmol H2mg chlorophyllh) were described for the early chloroplast extract experiments and 335
genetic fusions of PSI to [NiFe] or [FeFe] hydrogenases (McTavish 1998 Ihara et al 2006a 336
Yacoby et al 2011) higher rates of between 2000 and 3000 μmol H2mg chlorophyllh have 337
been achieved with wired PSI-[FeFe] hydrogenase complexes and genetically fused PSI-338
[NiFe] hydrogenase complexes assembled on a gold electrode (Krassen et al 2009 Lubner 339
et al 2011) Few data are available with respect to the longevity of the PSI-hydrogenase 340
systems however a minimum lifetime of 64 days was reported for a wired [FeFe] 341
hydrogenase-PSI complex at room temperature and under ambient illumination (Lubner et 342
al 2010) 343
The future use of hydrogenases in photosynthesis-driven H2 production will strongly 344
depend on whether or not it is possible to overcome the O2 sensitivity of many hydrogenases 345
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15
by for instance employing oxygen-tolerant [NiFe] hydrogenases (Burgdorf et al 2005 346
Schiffels et al 2013) If this is not possible their efficient use in vivo in thylakoids which 347
inevitably generate O2 during linear electron flow will be impossible However as 348
demonstrated with the gold surface system (Krassen et al 2009) the design of novel 349
matrices into which the hybrid system can be incorporated may markedly enhance the 350
efficiency 351
352
Bio-nano hybrids Use of photosynthesis as a source of electrons for non-biological 353
processes 354
From bio-bio hybrids it is only a small step to developing bio-nano hybrids as demonstrated 355
by PSI hybrids that employ abiotic catalysts for photosynthetic hydrogen production instead 356
of hydrogenase In fact abiotic catalysts have the advantage of bypassing the lability of 357
hydrogenases in the presence of oxygen PSI-platinum hybrids have been produced by 358
combining PSI with platinum nanoparticles (either directly or via tethering by nanowires) or 359
platinum nanoclusters (Kargul et al 2012 Fukuzumi 2015 Utschig et al 2015) (Fig 5A 360
Table 4) Current PSI-platinum hybrids are less efficient than the most advanced PSI-361
hydrogenase systems but are extremely robust (Utschig et al 2015) However future 362
widespread usage of the PSI-platinum system will be limited by the high cost of platinum A 363
more economical alternative to precious metals are earth-abundant molecular catalysts 364
However hybrids consisting of PSI and earth-abundant molecular catalysts have a much 365
shorter working life than platinum-based configurations (Utschig et al 2015) likely due to 366
instability of the molecular catalyst 367
PSI-based photocurrent-producing devices constitute another class of photosynthesis-368
derived nano-bio systems (Table 4 Fig 5) In such devices PSI is immobilized onto 369
electrodes Many variants of this concept have been tested such as varying the electrode 370
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16
materials immobilizationorientation strategies andor artificial redox mediators (Nguyen and 371
Bruce 2014 Janna Olmos and Kargul 2015 Plumereacute and Nowaczyk 2017 Kargul et al 372
2018) PSI must be immobilized on the electrode surface in such a way that electron transfers 373
between the electrodes and the oxidizing (P700) and reducing (FB - the terminal [4Fe-4S] 374
cluster or an intermediate electron transporter) sites of PSI can proceed with the required 375
efficiency Electrons are transferred between the electrodes and the oxidizing or reducing 376
sides of PSI either by a diffusible redox mediator or molecular wires Examples of electrode 377
materials and redox mediators are provided in Table 4 After P700 photo-excitation electrons 378
are transferred from P700 via several factors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB) to the 379
iron-sulfur cluster FB (see legend of Box 1) As in the case of PSI-hydrogenase and PSI-380
platinum nanoparticles PSI can be wired to its electrodes This has been achieved by wiring 381
the A1 cofactor (phylloquinone) to the substrate surface such that electrons are directly 382
transferred from A1 to the electrode thus bypassing the downstream FeS clusters (FX FA FB) 383
in the stromal domain of PSI (Terasaki et al 2007 Miyachi et al 2009 Terasaki et al 384
2009 Miyachi et al 2010) 385
Modifications of PSI have been utilized to enhance the efficiency of the photocurrent-386
generating system (Das et al 2004 Frolov et al 2005 Carmeli et al 2010) As mentioned 387
previously fusions to the stroma-faced PSI subunit PsaE can be used to link new components 388
to PSI however in this case PsaD fusions were used To this end recombinant His-tagged 389
PsaD was immobilized on the functionalized electrode surface which was then exposed to 390
native PSI complexes resulting in immobilized PSI with P700 facing away from the 391
electrode (Das et al 2004) Another way to control the orientation of PSI during 392
immobilization involves introducing cysteine mutations To allow for direct thiol coupling to 393
an Au surface various residues on the lumen-exposed face of PSI were replaced by cysteine 394
and tested (Frolov et al 2005) PSI attachment was achieved with all single mutants even 395
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17
those placed further from the P700 site suggesting that a specific location is not required as 396
long as the cysteine is exposed at the luminal surface of PSI The concept of targeted 397
attachment via introduced cysteine residues was exploited in subsequent studies to link PSI to 398
maleimide-functionalized gallium arsenide (Frolov et al 2008) to immobilize PSI between 399
the substrate and a metallized scanning near-field optical microscopy tip (Gerster et al 400
2012) and to bind PSI to carbon nanotubes (Kaniber et al 2010) Another modification of 401
PSI is represented by the attachment of plasmonic metal nanoparticles which resulted in 402
enhanced light absorption (Carmeli et al 2010) even in the green part of the solar spectrum 403
that is not normally absorbed (Szalkowski et al 2017) This suggests that it is possible to 404
enhance light absorption by PSI in vitro through the attachment of abiotic components that 405
act as optical antennae to extend the spectrum of photons available for P700 activation 406
Taken together these efforts demonstrate that PSI-based photocurrent-generating 407
systems are still in an exploratory phase with many variants under development In the next 408
phase viable building blocks and reference systems should be established that can serve as 409
starting points for the systematic engineering of superior systems This will require the 410
modification of PSI for optimal effect in artificial systems and will undoubtedly differ 411
substantially from the original environment in which PSI was molded by biological 412
evolution 413
414
Concluding remarks and outlook 415
Enhancing photosynthesis and growth can be achieved by a simple overexpression of certain 416
photosynthetic proteins and PSI can be coupled to previously unconnected biotic or abiotic 417
components to generate valuable compounds hydrogen or electricity Moreover entire 418
photosynthetic complexes can be functionally expressed in distantly related species (as 419
demonstrated for RuBisCO Aigner et al 2017) Thus what are the next goals and which 420
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18
challenges need to be overcome Two challenges for the in vivo systems are obvious (i) 421
enhancing the efficiency of in-vivo bio-bio hybrids and (ii) upscaling the size of ldquosynthetic 422
photosynthetic modulesrdquo to cover entire photosystems or complex antenna systems 423
With respect to the enhancement of in vivo cyanobacterial and algal systems 424
harboring hybrid configurations in which photosynthesis directly drives previously 425
unconnected pathways the use of laboratory evolution offers a unique opportunity to tailor 426
these systems for their intended purpose Laboratory evolution utilizes the high rate of 427
evolution typical in microbial systems (in particular if suitable selection conditions can be 428
designed) to fine tune and optimize processes through selection of advantageous genetic 429
variation While this strategy has been employed in E coli and yeast with impressive success 430
now photosynthetic microbial systems are emerging as attractive targets for this approach 431
(Leister 2017) 432
The exchange of entire multiprotein complexes between distantly related species will 433
not be a simple exercise because the ldquofrozen metabolic staterdquo of the core photosynthetic 434
complexes will necessitate the exchange of major parts of photosystems rather than 435
individual subunits The RuBisCO case study by Aigner et al (2017) represents of promising 436
proof of principle but one needs to consider that the synthetic RuBisCO module comprised 437
only the two different subunits present in the mature complex and five auxiliary factors for its 438
assembly Entire photosystems will require much larger ldquosynthetic photosynthetic modulesrdquo 439
and many of the auxiliary factors have not been identified yet Therefore when designing 440
these complex ldquosynthetic photosynthetic modulesrdquo we will identify the set of components 441
that are sufficient (and not only necessary) to drive photosynthesis providing an 442
unprecedentedly deep understanding of this fundamental and complex process 443
Given that the problems described above can be solved what will be the next steps in 444
the synthetic biology of the light reactions of photosynthesis The combination of ldquosynthetic 445
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19
photosynthetic modulesrdquo from diverse species could allow the design of novel variants of 446
photosynthesis Numerous instances of such ldquorecombined photosynthetic variantsrdquo can be 447
imagined including plants that employ cyanobacteria-derived phycobilisomes for highly 448
sufficient photosynthesis under low light conditions cyanobacteria that employ plant-derived 449
LHCs as antenna to shift light saturation of photosynthesis to higher intensities or the 450
integration of cyanobacterial Chl d and Chl f (which can absorb far-red and near infra-red 451
light) into algal or plant photosynthesis to expand the spectral region available to drive 452
photosynthesis (Loughlin et al 2013 Ho et al 2016) Moreover such variants of 453
recombined photosynthesis could be further optimized by laboratory evolution within a 454
suitable microbial chassis However such recombined photosynthetic variants cannot be 455
considered a truly novel type of photosynthesis because they would only bring preexisting 456
pieces together that evolution has separated Nevertheless they could be an important step 457
towards the ambitious goal to design truly novel ldquosynthetic photosynthetic modulesrdquo that 458
contain more efficient substitutes of the ldquofrozen metabolic accidentsrdquo discussed above 459
Ample proof of functionality for in-vivo hybrids (between photosynthesis and 460
previously unconnected metabolic pathways) and in-vitro hybrids (between PSI and biotic or 461
abiotic catalysts) has been obtained but such systems will only be commercially successful if 462
they can compete with established non-biological systems Tailoring of PSI in cyanobacteria 463
where techniques like gene replacement and gene modification are routine may contribute to 464
further improving the efficiency and robustness of in vitro and in vivo hybrids One 465
promising route could be to identify those parts of the original PSI (which evolved under 466
constraints imposed by the cyanobacterial cell) that are necessary for hybrid devices (a 467
ldquominimalrdquo PSI) Such bio-nano systems can be optimized to include novel non-biological 468
components that replace or complement natural pigments andor the protein-based backbone 469
of photosystems going far beyond the limited toolbox of Naturersquos chemistry Such novel 470
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20
systems inspired by natural photosynthesis could be used to engage biologists in the design 471
of fundamentally different types of photosynthesis in living organisms 472
473
SUPPLEMENTAL DATA 474
Supplemental Table 1 Absencepresence of photosynthetic proteins in the three model 475
species Synechocystis PCC6803 (Syn) Chlamydomonas reinhardtii (Cr) and Arabidopsis 476
thaliana (At) 477
478
ACKNOWLEDGMENTS 479
The authors thank Paul Hardy for critical reading of the manuscript 480
481
482
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21
Table 1 Replacement of conserved individual or multiple photosynthetic proteins 483
GeneProtein Description Protein
identity
Reference
psbAD1 Synechocystis D1 was replaced by its homolog from
Poa annua which resulted in slower growth This is
likely to be due to increased charge recombination
between the donor and acceptor sides of the reaction
center
86 Nixon et al
1991
psbBCP47 Synechocystis CP47 was replaced by its homolog
from spinach and photoautotrophy was lost
80 Vermaas et
al 1996
psbCCP43 Synechocystis CP43 was replaced by its homolog
from spinach and photoautotrophy was lost
85 Carpenter et
al 1993
psbHPsbH Synechocystis PsbH was replaced by its counterpart
from maize The resulting strain displayed increased
light sensitivity and lower chlorophyll content
78 Chiaramonte
et al 1999
psaAPsaA Synechocystis PsaA was replaced by its equivalent
from A thaliana This resulted in reduced photo-
autotrophical growth and a drastically reduced
ChlPC ratio
80 Viola et al
2014
psbABCDEF
D1CP47CP43D2
Cyt b559-+
All six core subunits of C reinhardtii were replaced
by their counterparts from two different green algae
(V carteri and S obliquus) The resulting strains
were photoautotrophic but showed reduced
photosynthetic efficiency and the heterologous
82 -
99
Gimpel et al
2016
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22
proteins reached only between 10 and 20 of the
levels of those they replaced
484
485
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23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
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24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
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25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
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26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
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28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
32
References 565
566
Aigner H Wilson RH Bracher A Calisse L Bhat JY Hartl FU Hayer-Hartl M (2017) 567
Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
chloroplast-ferredoxin-hydrogenase system Proc Natl Acad Sci U S A 70 2317-2320 571
Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
complements ferredoxin deficiency in knocked-down transgenic tobacco plants Plant 574
J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
photosynthesis for energy production Curr Opin Chem Biol 17 457-461 577
Burgdorf T Lenz O Buhrke T van der Linden E Jones AK Albracht SP Friedrich B 578
(2005) [NiFe]-hydrogenases of Ralstonia eutropha H16 modular enzymes for 579
oxygen-tolerant biological hydrogen oxidation J Mol Microbiol Biotechnol 10 181-580
96 581
Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
(2010) Broad band enhancement of light absorption in photosystem I by metal 583
nanoparticle antennas Nano Lett 10 2069-2074 584
Carpenter SD Ohad I Vermaas WF (1993) Analysis of chimeric spinachcyanobacterial 585
CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
the water-splitting system of Photosystem II Biochim Biophys Acta 1144 204-212 587
Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
Eur J Biochem 260 833-843 593
Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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33
Ciornii D Riedel M Stieger KR Feifel SC Hejazi M Lokstein H Zouni A Lisdat F 598
(2017) Bioelectronic Circuit on a 3D Electrode Architecture Enzymatic Catalysis 599
Interconnected with Photosystem I J Am Chem Soc 139 16478-16481 600
Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel 601
genetic diversity Philos Trans R Soc Lond B Biol Sci 372 602
Das R Kiley PJ Segal M Norville J Yu AA Wang L Trammell SA Reddick LE 603
Kumar R Stellacci F Lebedev N Schnur J Bruce BD Zhang S Baldo M (2004) 604
Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
by thermal dissipation of excess energy Biochem Soc Trans 38 651-660 608
Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
device by direct chemical binding of the photosynthetic reaction center protein to 610
metal surfaces Advanced Materials 17 2434-2437 611
Frolov L Rosenwaks Y Richter S Carmeli C Carmeli I (2008) Photoelectric junctions 612
between GaAs and photosynthetic reaction center protein J Phys Chem C 112 613
13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I 617
Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
reinhardtii ACS Synth Biol 5 589-596 624
Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
state biophotovoltaic cells containing photosystem I Adv Mater 26 4863-4869 630
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DR Niyogi KK Long SP (2018) Photosystem II subunit S overexpression increases 632
the efficiency of water use in a field-grown crop Nat Commun 9 868 633
Gnanasekaran T Karcher D Nielsen AZ Martens HJ Ruf S Kroop X Olsen CE 634
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cytochrome P450-dependent dhurrin pathway from Sorghum bicolor into Nicotiana 636
tabacum chloroplasts for light-driven synthesis J Exp Bot 67 2495-2506 637
Haniewicz P Abram M Nosek L Kirkpatrick J El-Mohsnawy E Olmos JDJ Kouřil 638
R Kargul JM (2018) Molecular mechanisms of photoadaptation of photosystem I 639
supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
harvesting chlorophyll ab-binding protein in Synechocystis sp PCC 6803 Eur J 643
Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
synthase is a highly divergent paralog of PsbA of photosystem II Science 353 646
Holt NE Fleming GR Niyogi KK (2004) Toward an understanding of the mechanism of 647
nonphotochemical quenching in green plants Biochemistry 43 8281-8289 648
Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
D Kamachi T Okura I (2006a) Light-driven hydrogen production by a hybrid 650
complex of a [NiFe]-hydrogenase and the cyanobacterial photosystem I Photochem 651
Photobiol 82 676-682 652
Ihara M Nakamoto H Kamachi T Okura I Maeda M (2006b) Photoinduced hydrogen 653
production by direct electron transfer from photosystem I cross-linked with 654
cytochrome c3 to [NiFe]-hydrogenase Photochem Photobiol 82 1677-1685Janna 655
Olmos JD Kargul J (2015) A quest for the artificial leaf Int J Biochem Cell Biol 656
66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
Pawlak D Kargul J (2017) Biofunctionalisation of p-doped silicon with cytochrome 659
c553 minimises charge recombination and enhances photovoltaic performance of the 660
all-solid-state photosystem I-based biophotoelectrode RSC Adv 7 47854-47866 661
Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations 662
ACS Chem Biol 6 533-539 663
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35
Jensen PE Leister D (2014) Chloroplast evolution structure and functions F1000Prime 664
Rep 6 40 665
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip 666
functionalization of carbon nanotubes with photosystem I J Am Chem Soc 132 667
2872-2873 668
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and 669
its application in biomimetic solar-to-fuel systems J Plant Physiol 169 1639-1653 670
Kargul J Bubak G Andryianau G (2018) Biophotovoltaic systems based on 671
photosynthetic complexes In Wandelt K (Ed) Encyclopedia of Interfacial 672
Chemistry Surface Science and Electrochemistry vol 7 pp 43-63 673
Kim YS Hara M Ikebukuro K Miyake J Ohkawa H Karube I (1996) Photo-induced 674
activation of cytochrome P450reductase fusion enzyme coupled with spinach 675
chloroplasts Biotechnol Tech 10 717minus720 676
Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic 677
hydrogen production by a hybrid complex of photosystem I and [NiFe]-hydrogenase 678
ACS Nano 3 4055-4061 679
Kromdijk J Glowacka K Leonelli L Gabilly ST Iwai M Niyogi KK Long SP (2016) 680
Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
Kubota H Sakurai I Katayama K Mizusawa N Ohashi S Kobayashi M Zhang P Aro 683
EM Wada H (2010) Purification and characterization of photosystem I complex 684
from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim 685
Biophys Acta 1797 98-105 686
Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future 702
by engineering crop photosynthesis and yield potential Cell 161 56-66 703
Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
(2011) Solar hydrogen-producing bionanodevice outperforms natural photosynthesis 709
Proc Natl Acad Sci U S A 108 20988-20991 710
Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
production Biochemistry 49 10264-10266 713
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503-519 716
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hydrogenases J Biochem 123 644-649 718
Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
(2016) Fusion of ferredoxin and cytochrome P450 enables direct light-driven 720
biosynthesis ACS Chem Biol 11 1862-1869 721
Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous 722
enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
Y Nishihara H (2010) A photosensing system composed of photosystem I 725
molecular wire gold nanoparticle and double surfactants in water Chem Commun 726
(Camb) 46 2557-2559 727
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
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fabrication of a bio-photoelectrode J Nanosci Nanotechnol 9 1722-1726 730
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Molina-Heredia FP Wastl J Navarro JA Bendall DS Hervas M Howe CJ De La Rosa 731
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Nanosci Nanotechnol 9 1709-1713 736
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1837 1553-1566 739
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Rev Plant Biol 64 609-635 741
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biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
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Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
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hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
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phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
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overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
S Cazzaniga S Bassi R (2015) Heterologous expression of moss light-harvesting 764
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complex stress-related 1 (LHCSR1) the chlorophyll a-xanthophyll pigment-protein 765
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24340-24354 767
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Adv Biochem Eng Biotechnol 158 111-136 769
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3619-3639 782
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2189 785
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134-145 788
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assembled on silver nanowires Nanoscale 9 10475-10486 791
792
Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
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1585-1587 797
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molecular wire Biochim Biophys Acta 1767 653-659 802
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N 803
(2006) Functional replacement of ferredoxin by a cyanobacterial flavodoxin in 804
tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050 805
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
U S A 104 11495-11500 809
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Norici A Shotland Y Ohad I Kaplan A (2016) The mechanisms whereby the 811
green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled 812
photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
Photosystem I-catalyst hybrids Curr Opin Chem Biol 25 1-8 815
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium 816
Synechocystis sp PCC 6803 carrying spinach sequences Construction and function 817
Photosynth Res 48 147-162 818
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replacement in Synechocystis sp PCC 6803 Microb Cell Fact 13 4 820
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
thaliana J Biol Chem 278 31286-31289 826
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M 827
Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
dependent pathways into Synechocystis sp PCC 6803 Metab Eng 33 1-11 830
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Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in 831
functional photosystem II complexes of cyanobacteria Proc Natl Acad Sci U S A 98 832
14168-14173 833
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) 834
Photosynthetic electron partitioning between [FeFe]-hydrogenase and 835
ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S 836
A 108 9396-9401 837
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of 838
alternative electron flow by flavodiiron proteins in Arabidopsis Nat Plants 2 16012 839
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ 840
(2018) Ectopic expression of SsPETE2 a plastocyanin from Suaeda salsa improves 841
plant tolerance to oxidative stress Plant Sci 268 1-10 842
843
844
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium Synechocystis sp PCC 6803 carrying spinachsequences Construction and function Photosynth Res 48 147-162
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene replacement in Synechocystis sp PCC 6803Microb Cell Fact 13 4
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron Protein Substitutes for Cyclic Electron Flow withoutCompeting CO2 Assimilation in Rice Plant Physiol 176 1509-1518
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) Plastocyanin is indispensable for photosyntheticelectron flow in Arabidopsis thaliana J Biol Chem 278 31286-31289
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M Thofner JF Olsen CE Mottawie MS Burow M Pribil MFeussner I Moller BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 dependent pathways intoSynechocystis sp PCC 6803 Metab Eng 33 1-11
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Google Scholar Author Only Title Only Author and Title
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in functional photosystem II complexes ofcyanobacteria Proc Natl Acad Sci U S A 98 14168-14173
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) Photosynthetic electron partitioning between [FeFe]-hydrogenase and ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S A 108 9396-9401
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of alternative electron flow by flavodiiron proteins inArabidopsis Nat Plants 2 16012
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Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ (2018) Ectopic expression of SsPETE2 a plastocyanin fromSuaeda salsa improves plant tolerance to oxidative stress Plant Sci 268 1-10
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wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
3
in successful outcomes and is limited to a small subset of regulatory proteins (Pribil et al 50
2010 Kromdijk et al 2016 Glowacka et al 2018) 51
In addition to enhancing the light reactions for improved biomass production and 52
yield concepts have been developed for the direct coupling of photosynthesis to other 53
important pathways that are indirectly connected to photosynthesis in natural systems for 54
instance because they reside in different subcellular compartments (Lassen et al 2014a) 55
Direct coupling would be expected to boost the production of rare compounds in cells and 56
contribute to the biotechnological production of high-value compounds in vivo 57
In vitro it is possible to functionally link components of photosynthesis with entirely 58
unrelated biotic or abiotic catalysts or with abiotic electrode materials In fact Photosystem I 59
(PSI) is naturally adapted for highly efficient light harvesting and charge separation (Kargul 60
et al 2012 Nguyen and Bruce 2014 Martin and Frymier 2017) and has been described as 61
the most efficient natural nano-photochemical machine (Nelson 2009) Upon light excitation 62
PSI produces the most powerful naturally occurring reducing agent ndash P700 ndash which 63
together with an exceptionally long-lived charge-separated state provides sufficient driving 64
force to reduce protons to H2 at neutral pH PSI operates with a quantum yield close to 10 65
and currently no synthetic system has approached its remarkable efficiency Moreover PSI 66
preparations are generally robust especially those obtained from extremophilic microalgae 67
(Kubota et al 2010 Haniewicz et al 2018) The superior qualities of PSI have stimulated 68
strategies designed to generate in vitro hybrids of PSI and various types of redox-active 69
catalysts or other materials 70
In sum the light reactions of photosynthesis are a prime target for genetic engineering 71
and synthetic biology approaches for three major reasons (1) Enhancement of the process in 72
vivo to increase the efficiency of light use promises to increase biomass and crop yields (2) 73
Coupling of the light reactions of photosynthesis to previously unconnected pathways will 74
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4
enable us to utilize the reducing power of the light reactions directly to produce large 75
amounts of high-value compounds in vivo (3) The high efficiency and robustness of PSI 76
should allow it to be used in hybrids with biotic or abiotic components to generate hydrogen 77
simple carbon-based solar fuels or electricity in vitro In this review the background to and 78
recent developments in these three strategies are discussed 79
80
Natural building blocks of photosynthesis 81
During photosynthesis carbon dioxide (CO2) is converted into organic compounds 82
principally sugars using sunlight as energy In plants algae and cyanobacteria 83
photosynthesis uses water as the electron donor for chemical reduction of CO2 and releases 84
oxygen Algae and plants derive from a lineage that arose from an endosymbiotic relationship 85
between a protist and a cyanobacterium Chloroplasts the photosynthetic organelles in 86
modern plants are in fact the descendants of this ancient symbiotic cyanobacterium and 87
possess an internal membrane system that resembles the thylakoid membranes of modern-day 88
cyanobacteria Indeed during the evolutionary transition from cyanobacteria to chloroplasts 89
the overall organization and mode of action of the photosynthetic machinery was retained 90
(Box 1) However significant changes have occurred in the subunit composition of 91
photosystems (Fig 1) their posttranslational modification (Pesaresi et al 2011) the 92
harvesting of light energy pigment composition and regulation of photosynthesis (Box 93
2)(Mullineaux and Emlyn-Jones 2005 Rochaix 2007 Holt et al 2004 de Bianchi et al 94
2010) 95
Its evolutionary history makes photosynthesis well-suited for synthetic biology 96
strategies The evolutionary diversification of the photosynthetic machinery has provided a 97
set of building blocks ranging from single proteins such as the soluble electron transporters 98
(plastocyanin cytochrome c6 flavodoxin and ferredoxin) to multiprotein complexes like 99
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5
photosystems and antenna complexes (phycobiliosomes and light-harvesting complexes 100
(LHCs)) In principle the building blocks should be interchangeable between cyanobacteria 101
algae and plants Instances of the swapping of homologous photosynthetic proteins between 102
species by means of genetic engineering are discussed in the next section to highlight the 103
complications associated with apparently straightforward approaches The focus then shifts to 104
genuinely synthetic approaches in which specific photosynthetic building blocks have been 105
introduced into photosynthetic species that lack them In the subsequent two sections the 106
combination of non-photosynthetic (Bio-bio hybrids using photosynthesis as an electron 107
source for unrelated biological processes) and non-biological building blocks (Bio-nano 108
hybrids using photosynthesis as an electron source for non-biological processes) with 109
components of the photosynthetic machinery are described An overview of these approaches 110
is provided in Figure 2 111
112
Exchange of conserved photosynthetic modules 113
Theoretically it should be relatively easy to exchange individual conserved photosynthetic 114
proteins between different species even in such distantly related organisms as cyanobacteria 115
and plants However in practice these simple genetic engineering exercises can be 116
problematic (Table 1) Several individual proteins from cyanobacterial PSII (D1 CP43 and 117
PsbH) and PSI (PsaA) have indeed been genetically replaced by their plant counterparts with 118
varying success Synechocystis strains expressing the D1 protein from Poa annua or PsbH 119
from maize (Zea mays) could still perform photosynthesis ndash albeit with less efficiency than 120
the WT strain (Nixon et al 1991 Chiaramonte et al 1999) ndash but replacement of 121
Synechocystis CP43 or CP47 by their homologs from spinach (Spinacia oleracea) was 122
incompatible with photoautotrophy (Carpenter et al 1993 Vermaas et al 1996) Similarly 123
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6
in Synechocystis strains equipped with Arabidopsis thaliana PsaA PSI function was severely 124
disrupted (Viola et al 2014) 125
Such complications resulting from the replacement of core subunits of photosystems 126
despite their high similarity (78ndash86 identity between the cyanobacterial and plant proteins 127
Table 1) reflect the so-called ldquofrozen metabolic staterdquo of the photosynthetic multiprotein 128
complexes This term was coined by Gimpel et al (2016) but was originally introduced as 129
ldquofrozen metabolic accidentrdquo by Shi et al (2005) The ldquofrozen metabolic accidentrdquo concept 130
refers to the observation that selection has not significantly altered biophysically and 131
physiologically inefficient photosynthetic proteins (including the D1 protein of PSII or 132
RuBisCO of the Calvin-Benson cycle) over billions of years of evolution In fact 133
bioinformatic analysis of photosynthetic cyanobacterial genes suggests that the evolution rate 134
of proteins at the core of the photosynthetic apparatus is highly constrained by protein-135
protein protein-lipid and protein-cofactor interactions (Shi et al 2005) This provides an 136
internal selection pressure conserving the sequence of proteins in photosynthetic 137
multiprotein complexes and ndash in case of prokaryotes ndash also the genomic organization of their 138
genes (Shi et al 2005) The term ldquofrozen metabolic accidentrdquo was generalized to ldquofrozen 139
metabolic staterdquo by Gimpel et al (2016) and implies that in each photosynthetic species 140
slightly distinct modules of the cores of photosynthetic multiprotein complexes have evolved 141
that are optimized with respect to their intrinsic interactions and that rarely tolerate the 142
alteration of single proteins by exchange or mutation In consequence the simultaneous 143
exchange of entire sets of core proteins (or ldquomodulesrdquo) with all their intrinsic interactions 144
should be more feasible than substituting individual proteins that may disrupt the ldquofrozen 145
metabolic staterdquo Such an experiment has been performed in the green alga Chlamydomonas 146
reinhardtii where the six PSII core proteins D1 CP47 CP43 D2 Cyt b559- and were 147
swapped for their homologs from two other green algal species (Gimpel et al 2016) 148
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7
Photoautotrophy was not affected by the exchange of this synthetic biology module although 149
the fully altered strains performed suboptimally compared to strains in which only 1ndash5 genes 150
were exchanged However in control experiments where the synthetic C reinhardtii six-gene 151
module was re-introduced to the C reinhardtii deletion strain that lacked all six genes only 152
about 86 of wild-type PSII functionality was rescued Tentative explanations for this 153
decreased efficiency include (i) off-target effects of the PSII gene deletions on the operon 154
components and tRNA genes associated with these PSII loci (ii) misregulation of the 155
transferred PSII genes because their expression cassettes lacked unidentified cis-acting DNA 156
elements and (iii) perturbation of polycistron-dependent post-transcriptional regulation of the 157
transformed genes since they were no longer part of an operon (Gimpel et al 2016) 158
Taken together the outcomes of these replacement experiments indicate that 159
exchanging conserved photosynthetic proteins from multiprotein complexes can be 160
problematic given the highly integrated nature of the photosynthetic machinery Therefore 161
approaches designed to enhance photosynthesis such as introducing the high-light-resistant 162
D1 protein from a green alga that lives under extreme conditions (Treves et al 2016) into 163
crop plants do not appear promising Instead entire (sub)complexes with their internal 164
network of evolutionarily optimized interactions should be transferable between species 165
166
Exchange of non-conserved photosynthetic modules 167
Inspection of the repertoire of subunits of the photosynthetic machinery in the three model 168
species Synechocystis PCC6803 C reinhardtii and A thaliana which represent different 169
stages in the evolution of oxygen-generating photosynthesis shows that the most dramatic 170
changes in the photosynthetic proteome occurred during the transition from the 171
cyanobacterial endosymbiont (for which Synechocystis serves as a proxy) to the chloroplast 172
of unicellular algae (with C reinhardtii as proxy) (Fig 3 Supplemental Table 1) In 173
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8
particular phycobilisomes flavodoxin and several photosystem subunits were lost while 174
LHCs some novel photosystem subunits and several proteins involved in alternative electron 175
pathways or photoprotection evolved During the transition from algal chloroplasts to those 176
of flowering plants relatively few proteins were lost (eg flavodiiron proteins and the 177
canonical cytochrome c6) or acquired (Lhcb6CP24) (Fig 3 Supplemental Table 1) The 178
NAD(P)H dehydrogenase (NDH) complex involved in antimycin A-insensitive cyclic 179
electron flow (see Box 1) is a special case since the chloroplast NDH from flowering plants 180
traces back to the cyanobacterial complex but the complex was lost during evolution in C 181
reinhardtii (Fig 3 Supplemental Table 1) 182
Several attempts have been made to introduce photosynthetic proteins into species 183
that lack the corresponding homolog (Table 2) These heterologous expression approaches 184
have been successful for the soluble electron transporters flavodoxin cytochrome c6 and 185
flavodiiron proteins Indeed cyanobacterial flavodoxin can at least partially replace plant 186
ferredoxin and confer enhanced stress tolerance when expressed in addition to ferredoxin 187
(Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011) Similarly red algal 188
cytochrome c6 enhances growth and photosynthesis of A thaliana plants (Chida et al 2007) 189
Since A thaliana lacks a functional cytochrome c6 that can transfer electrons from the Cyt b6f 190
complex to PSI (Molina-Heredia et al 2003 Weigel et al 2003) it is plausible that the 191
more oxidized plastoquinone pool in the transgenic plants is a direct consequence of 192
additional PSI reduction mediated by the algal protein (Chida et al 2007) Interestingly it 193
seems to make no difference if an endogenous soluble electron transport protein (see Box 3) 194
or its heterologous equivalent from a distant species is overexpressed For instance 195
overexpression of the endogenous soluble proteins plastocyanin and ferredoxin can also 196
enhance growth in plants (Pesaresi et al 2009 Lin et al 2013 Chang et al 2017 Zhou et 197
al 2018) Interestingly and rather unexpectedly this concept can also work for certain 198
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9
proteins that are part of multiprotein complexes (Simkin et al 2017 see Box 3) This 199
indicates that the quantity of such proteins is relevant for growth enhancement and not its 200
evolutionary origin 201
More recently the two Physcomitrella patens flavodiiron protein (FLV) genes FlvA 202
and FlvB were introduced into A thaliana which like other angiosperms has lost FLVs 203
during evolution (Yamamoto et al 2016) FLVs are the main mediators of pseudo-cyclic 204
electron flow in photosynthetic organisms but heterologous expression of FLVs in A 205
thaliana had no effect on steady-state photosynthesis and growth of the transgenic plants 206
(Yamamoto et al 2016) However the Arabidopsis FLV lines displayed higher 207
photosynthetic yields just after the onset of actinic light following a long dark adaptation 208
suggesting that the FLVs mediated a large electron sink during the induction of 209
photosynthesis In fluctuating light experiments the Arabidopsis FLV lines had much less 210
PSI acceptor side limitation implying that the large FLV-mediated electron sink makes 211
photosynthesis more resistant to the fluctuating light Consequently this protective effect of 212
FLVs is more pronounced in Arabidopsis lines that are more sensitive to fluctuating light like 213
the pgr5 mutant defective in antimycin A-sensitive cyclic electron flow (see Box 1 Leister 214
and Shikanai 2013 Yamamoto et al 2016) Similarly expression of FLVs in a rice (Oryza 215
sativa) line with markedly reduced cyclic electron flow restored CO2 assimilation and growth 216
rate to wild-type levels (Wada et al 2018) Like FLVs LHcxLHCSR proteins play a role in 217
photoprotection in green algae and mosses but have been lost in angiosperms during 218
evolution Heterologous expression of P patens LHCSR1 in Nicotiana benthamiana and 219
Nicotiana tabacum yielded an active protein that has properties similar if not identical to 220
those of moss LHCSR1 (Pinnola et al 2015) 221
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10
Efforts to create LHCII complexes like those in plants by heterologously expressing 222
the membrane-spanning light-harvesting chlorophyll ab-binding protein Lhcb from Pisum 223
sp (pea) in Synechocystis were unsuccessful 224
Although the pea Lhcb protein was synthesized in Synechocystis and integrated into 225
the membrane it did not accumulate to steady-state levels detectable by immunoblot analysis 226
(He et al 1999) Possible explanations are that Lhcb is rapidly degraded either because its 227
ldquounfamiliarrdquo structure makes it a good substrate for the cyanobacterial proteolytic system or 228
it cannot foldassemble properly due to the lack of plant-specific pigments or assembly 229
factors Interestingly chlorophyll b production (see Box 2) after introduction of plant 230
chlorophyll a oxygenase (CAO) is boosted when Lhcb is expressed even though LHCII does 231
not accumulate in detectable amounts (Xu et al 2001) 232
Even soluble multiprotein complexes can be heterologously expressed as has been 233
impressively demonstrated from the carbon-fixation end of photosynthesis For example by 234
coexpression of five auxiliary factors a functional plant RuBisCo complex was successfully 235
assembled in Escherichia coli (Aigner et al 2017) This result is in line with the ldquofrozen 236
metabolic staterdquo concept showing that photosynthetic proteins embedded in a network of 237
interactions with other proteins and auxiliary factors can be introduced into distantly related 238
species but only with their own interaction networks While Gimpel et al (2016) showed that 239
efficient gene expression needs to be accounted for when designing synthetic modules for the 240
transfer of photosystem subunits from one species to another Aigner et al (2017) 241
demonstrated that auxiliary factors required for the biogenesis of photosynthetic 242
(sub)complexes need to be considered in such experiments adding additional facets to the 243
ldquofrozen metabolic staterdquo concept 244
Auxiliary factors required for the accumulation of photosynthetic multiprotein 245
complexes include (i) cofactors like iron-sulfur clusters and pigments (see Box 2) (ii) 246
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11
chaperones that are required for the insertion of co-factors (eg pigments into LHCs Schmid 247
2008) and (iii) assembly factors Assembly factors are required to support the stepwise 248
assembly and functionality of the multiproteinpigment complexes and many of these are 249
conserved between photosynthetic species (Nixon et al 2010 Nickelsen and Rengstl 2013 250
Jensen and Leister 2014) Therefore the exchange of entire multiprotein complexes between 251
distantly related species will not be simple due to the repertoire of auxiliary factors that has 252
markedly changed during evolution Since the species that Gimpel et al (2016) studied were 253
closely related this aspect could be neglected In consequence the impact of these auxiliary 254
factors on the formation of multiproteinpigment complexes will have to be fully elucidated 255
to understand which factors are sufficient to assemble a photosynthetic multiprotein complex 256
previous (genetic) approaches only identified factors required for this process Hence the 257
transfer of entire photosynthetic (sub)complexes between distantly related species by a 258
ldquosynthetic photosynthetic modulerdquo must include entire sets of strongly interacting proteins (to 259
address the ldquofrozen metabolic staterdquo) as well as all genetic elements and auxiliary factors 260
sufficient for efficient expression biogenesis and function of the proteins in the module 261
262
Bio-bio hybrids using photosynthesis as an electron source for unrelated biological 263
processes 264
The idea of using the reducing power of photosynthesis to drive unrelated metabolic reactions 265
has inspired several biotechnological concepts The photosynthesis-driven formation of 266
secondary metabolites has been demonstrated in vivo whereas light-driven generation of H2 267
by bio-bio hybrids so far works only in vitro and is closely related to bio-nano approaches 268
Therefore coupling of photosynthesis to previously unrelated pathways is discussed here 269
first followed by bio-bio systems for H2 generation 270
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12
Redirection of PSI reducing equivalents to drive reactions catalyzed by cytochrome 271
P450 enzymes has been achieved in vivo by genetic modifications of plants and 272
cyanobacteria (Lassen et al 2014a Nielsen et al 2016 Mellor et al 2017) Cytochrome 273
P450s constitute the largest family of plant enzymes that acts on various endogenous and 274
xenobiotic molecules (Rasool and Mohamed 2016) Their extreme versatility and 275
irreversibility of catalyzed reactions make these enzymes very attractive for use in 276
biotechnology medicine and phytoremediation P450s are monooxygenases that insert an 277
oxygen atom into hydrophobic molecules which enhances their reactivity and hydrophilicity 278
Most eukaryotic P450s require NADPHcytochrome P450 reductase as the electron donor 279
The ER membrane is generally accepted to be the primary subcellular repository of 280
eukaryotic P450s and their NADPHcytochrome P450 reductase By relocating cytochrome 281
P450s to the chloroplasts the reducing power of photosynthesis can be directly targeted to 282
the reactions catalyzed by these enzymes thus providing the basis for the large-scale 283
production of valuable products Initial attempts to couple P450s with photosynthesis were 284
conducted in vitro (Table 3 Fig 4A) Spinach chloroplasts were combined with microsomes 285
from yeast cells that had been stably transformed with a fusion gene expressing the rat 286
CYP1A1-NADPHcytochrome P450 reductase fusion enzyme (Kim et al 1996) These 287
experiments confirmed that it is feasible to drive P450-mediated reactions using electrons 288
derived from photosynthetically generated NADPH Intriguingly the NADPHcytochrome 289
P450 reductase is not always essential as demonstrated by co-incubating CYP79A1 from 290
sorghum (Sorghum bicolor) with barley (Hordeum vulgare) PSI and employing ferredoxin to 291
directly deliver electrons from PSI to the P450 (Jensen et al 2011) This approach was also 292
shown to be practicable in vivo CYP79A1 either alone or in combination with CYP71E1 293
and the UDP-glucosyltransferase UGT85B1 was first targeted in vivo to cyanobacterial or 294
plant thylakoid membranes where they catalyzed the same reactions as in their original 295
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13
cellular compartment (the ER) utilizing photosynthetically reduced ferredoxin as the electron 296
donor (Nielsen et al 2013 Lassen et al 2014b Gnanasekaran et al 2016 Wlodarczyk et 297
al 2016) Genetic fusions have also been employed for the coupling of P450s to PSI 298
CYP79A1 has been fused to either cyanobacterial PsaM or Arabidopsis ferredoxin and the 299
engineered enzyme showed light-driven activity both in vivo and in vitro (Lassen et al 300
2014b Mellor et al 2016) In the latter case the efficiency of the system was enhanced 301
because the fusion could compete better with endogenous electron sinks coupled to metabolic 302
pathways (Mellor et al 2016) 303
In contrast to PSI-P450 hybrids PSI-hydrogenase hybrids currently function only in 304
vitro Unlike fossil fuels H2 is environmentally benign as it produces only water when 305
combusted Therefore in principle harnessing of the reducing power of photosynthesis for 306
the direct production of H2 (ie ultimately using sunlight and water) would yield a fully 307
sustainable system of energy generation PSI but not PSII provides a standard midpoint 308
potential that is sufficiently negative to power the reduction of protons to H2 (Utschig et al 309
2015) Hence approaches have been developed to engineer PSI to produce H2 either as 310
replacement or in addition to its natural product NADPH (see Figure 1 in Box 1) by 311
redirecting PSI electrons to a catalytic component This catalytic component can be abiotic or 312
biotic (hydrogenases) The feasibility of coupling H2 generation to photosynthesis was 313
demonstrated 45 years ago by mixing chloroplast preparations with ferredoxin and 314
hydrogenase (Benemann et al 1973) Twenty-five years later hydrogen evolution by direct 315
electron transfer (without ferredoxin) from PSI to hydrogenases was accomplished for the 316
first time (McTavish 1998) 317
Hydrogenases catalyze the reversible interconversion of H2 into protons and electrons 318
and are widespread in nature they occur in bacteria and archaea but also in some eukarya In 319
vivo hydrogenases can mediate photosynthetic H2 production albeit mostly indirectly or 320
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14
under anaerobic conditions due to their oxygen sensitivity (Ghirardi 2015 Oey et al 2016) 321
Hydrogenases can be classified according to their metal-ion composition eg [NiFe] and 322
[FeFe] hydrogenases (Lubitz et al 2014 Martin and Frymier 2017) [FeFe] hydrogenases 323
preferentially catalyze proton reduction and can evolve H2 at high rates but are extremely 324
sensitive to O2 and are the only type of hydrogenases found in eukaryotic microorganisms 325
[NiFe] hydrogenases are less sensitive to O2 but preferentially oxidize H2 under 326
physiological conditions (Lubitz et al 2014) In vitro both types of hydrogenases have been 327
directly linked to PSI (Table 3 Fig 4B) PSI-[NiFe] hydrogenase complexes have been 328
generated by fusing the hydrogenase genetically to the PsaE protein (Ihara et al 2006a) PSI-329
[FeFe] hydrogenase complexes were obtained by genetically fusing the hydrogenase to 330
ferredoxin (Yacoby et al 2011) or covalently linking the FeS clusters present in the 331
hydrogenase to PSI via a molecular wire (Lubner et al 2010 Lubner et al 2011) 332
Two parameters characterize the efficiency of these in-vitro systems their H2 333
production rate and longevity While low rates of H2 production (in the range from 01 to 10 334
μmol H2mg chlorophyllh) were described for the early chloroplast extract experiments and 335
genetic fusions of PSI to [NiFe] or [FeFe] hydrogenases (McTavish 1998 Ihara et al 2006a 336
Yacoby et al 2011) higher rates of between 2000 and 3000 μmol H2mg chlorophyllh have 337
been achieved with wired PSI-[FeFe] hydrogenase complexes and genetically fused PSI-338
[NiFe] hydrogenase complexes assembled on a gold electrode (Krassen et al 2009 Lubner 339
et al 2011) Few data are available with respect to the longevity of the PSI-hydrogenase 340
systems however a minimum lifetime of 64 days was reported for a wired [FeFe] 341
hydrogenase-PSI complex at room temperature and under ambient illumination (Lubner et 342
al 2010) 343
The future use of hydrogenases in photosynthesis-driven H2 production will strongly 344
depend on whether or not it is possible to overcome the O2 sensitivity of many hydrogenases 345
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15
by for instance employing oxygen-tolerant [NiFe] hydrogenases (Burgdorf et al 2005 346
Schiffels et al 2013) If this is not possible their efficient use in vivo in thylakoids which 347
inevitably generate O2 during linear electron flow will be impossible However as 348
demonstrated with the gold surface system (Krassen et al 2009) the design of novel 349
matrices into which the hybrid system can be incorporated may markedly enhance the 350
efficiency 351
352
Bio-nano hybrids Use of photosynthesis as a source of electrons for non-biological 353
processes 354
From bio-bio hybrids it is only a small step to developing bio-nano hybrids as demonstrated 355
by PSI hybrids that employ abiotic catalysts for photosynthetic hydrogen production instead 356
of hydrogenase In fact abiotic catalysts have the advantage of bypassing the lability of 357
hydrogenases in the presence of oxygen PSI-platinum hybrids have been produced by 358
combining PSI with platinum nanoparticles (either directly or via tethering by nanowires) or 359
platinum nanoclusters (Kargul et al 2012 Fukuzumi 2015 Utschig et al 2015) (Fig 5A 360
Table 4) Current PSI-platinum hybrids are less efficient than the most advanced PSI-361
hydrogenase systems but are extremely robust (Utschig et al 2015) However future 362
widespread usage of the PSI-platinum system will be limited by the high cost of platinum A 363
more economical alternative to precious metals are earth-abundant molecular catalysts 364
However hybrids consisting of PSI and earth-abundant molecular catalysts have a much 365
shorter working life than platinum-based configurations (Utschig et al 2015) likely due to 366
instability of the molecular catalyst 367
PSI-based photocurrent-producing devices constitute another class of photosynthesis-368
derived nano-bio systems (Table 4 Fig 5) In such devices PSI is immobilized onto 369
electrodes Many variants of this concept have been tested such as varying the electrode 370
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16
materials immobilizationorientation strategies andor artificial redox mediators (Nguyen and 371
Bruce 2014 Janna Olmos and Kargul 2015 Plumereacute and Nowaczyk 2017 Kargul et al 372
2018) PSI must be immobilized on the electrode surface in such a way that electron transfers 373
between the electrodes and the oxidizing (P700) and reducing (FB - the terminal [4Fe-4S] 374
cluster or an intermediate electron transporter) sites of PSI can proceed with the required 375
efficiency Electrons are transferred between the electrodes and the oxidizing or reducing 376
sides of PSI either by a diffusible redox mediator or molecular wires Examples of electrode 377
materials and redox mediators are provided in Table 4 After P700 photo-excitation electrons 378
are transferred from P700 via several factors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB) to the 379
iron-sulfur cluster FB (see legend of Box 1) As in the case of PSI-hydrogenase and PSI-380
platinum nanoparticles PSI can be wired to its electrodes This has been achieved by wiring 381
the A1 cofactor (phylloquinone) to the substrate surface such that electrons are directly 382
transferred from A1 to the electrode thus bypassing the downstream FeS clusters (FX FA FB) 383
in the stromal domain of PSI (Terasaki et al 2007 Miyachi et al 2009 Terasaki et al 384
2009 Miyachi et al 2010) 385
Modifications of PSI have been utilized to enhance the efficiency of the photocurrent-386
generating system (Das et al 2004 Frolov et al 2005 Carmeli et al 2010) As mentioned 387
previously fusions to the stroma-faced PSI subunit PsaE can be used to link new components 388
to PSI however in this case PsaD fusions were used To this end recombinant His-tagged 389
PsaD was immobilized on the functionalized electrode surface which was then exposed to 390
native PSI complexes resulting in immobilized PSI with P700 facing away from the 391
electrode (Das et al 2004) Another way to control the orientation of PSI during 392
immobilization involves introducing cysteine mutations To allow for direct thiol coupling to 393
an Au surface various residues on the lumen-exposed face of PSI were replaced by cysteine 394
and tested (Frolov et al 2005) PSI attachment was achieved with all single mutants even 395
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17
those placed further from the P700 site suggesting that a specific location is not required as 396
long as the cysteine is exposed at the luminal surface of PSI The concept of targeted 397
attachment via introduced cysteine residues was exploited in subsequent studies to link PSI to 398
maleimide-functionalized gallium arsenide (Frolov et al 2008) to immobilize PSI between 399
the substrate and a metallized scanning near-field optical microscopy tip (Gerster et al 400
2012) and to bind PSI to carbon nanotubes (Kaniber et al 2010) Another modification of 401
PSI is represented by the attachment of plasmonic metal nanoparticles which resulted in 402
enhanced light absorption (Carmeli et al 2010) even in the green part of the solar spectrum 403
that is not normally absorbed (Szalkowski et al 2017) This suggests that it is possible to 404
enhance light absorption by PSI in vitro through the attachment of abiotic components that 405
act as optical antennae to extend the spectrum of photons available for P700 activation 406
Taken together these efforts demonstrate that PSI-based photocurrent-generating 407
systems are still in an exploratory phase with many variants under development In the next 408
phase viable building blocks and reference systems should be established that can serve as 409
starting points for the systematic engineering of superior systems This will require the 410
modification of PSI for optimal effect in artificial systems and will undoubtedly differ 411
substantially from the original environment in which PSI was molded by biological 412
evolution 413
414
Concluding remarks and outlook 415
Enhancing photosynthesis and growth can be achieved by a simple overexpression of certain 416
photosynthetic proteins and PSI can be coupled to previously unconnected biotic or abiotic 417
components to generate valuable compounds hydrogen or electricity Moreover entire 418
photosynthetic complexes can be functionally expressed in distantly related species (as 419
demonstrated for RuBisCO Aigner et al 2017) Thus what are the next goals and which 420
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18
challenges need to be overcome Two challenges for the in vivo systems are obvious (i) 421
enhancing the efficiency of in-vivo bio-bio hybrids and (ii) upscaling the size of ldquosynthetic 422
photosynthetic modulesrdquo to cover entire photosystems or complex antenna systems 423
With respect to the enhancement of in vivo cyanobacterial and algal systems 424
harboring hybrid configurations in which photosynthesis directly drives previously 425
unconnected pathways the use of laboratory evolution offers a unique opportunity to tailor 426
these systems for their intended purpose Laboratory evolution utilizes the high rate of 427
evolution typical in microbial systems (in particular if suitable selection conditions can be 428
designed) to fine tune and optimize processes through selection of advantageous genetic 429
variation While this strategy has been employed in E coli and yeast with impressive success 430
now photosynthetic microbial systems are emerging as attractive targets for this approach 431
(Leister 2017) 432
The exchange of entire multiprotein complexes between distantly related species will 433
not be a simple exercise because the ldquofrozen metabolic staterdquo of the core photosynthetic 434
complexes will necessitate the exchange of major parts of photosystems rather than 435
individual subunits The RuBisCO case study by Aigner et al (2017) represents of promising 436
proof of principle but one needs to consider that the synthetic RuBisCO module comprised 437
only the two different subunits present in the mature complex and five auxiliary factors for its 438
assembly Entire photosystems will require much larger ldquosynthetic photosynthetic modulesrdquo 439
and many of the auxiliary factors have not been identified yet Therefore when designing 440
these complex ldquosynthetic photosynthetic modulesrdquo we will identify the set of components 441
that are sufficient (and not only necessary) to drive photosynthesis providing an 442
unprecedentedly deep understanding of this fundamental and complex process 443
Given that the problems described above can be solved what will be the next steps in 444
the synthetic biology of the light reactions of photosynthesis The combination of ldquosynthetic 445
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19
photosynthetic modulesrdquo from diverse species could allow the design of novel variants of 446
photosynthesis Numerous instances of such ldquorecombined photosynthetic variantsrdquo can be 447
imagined including plants that employ cyanobacteria-derived phycobilisomes for highly 448
sufficient photosynthesis under low light conditions cyanobacteria that employ plant-derived 449
LHCs as antenna to shift light saturation of photosynthesis to higher intensities or the 450
integration of cyanobacterial Chl d and Chl f (which can absorb far-red and near infra-red 451
light) into algal or plant photosynthesis to expand the spectral region available to drive 452
photosynthesis (Loughlin et al 2013 Ho et al 2016) Moreover such variants of 453
recombined photosynthesis could be further optimized by laboratory evolution within a 454
suitable microbial chassis However such recombined photosynthetic variants cannot be 455
considered a truly novel type of photosynthesis because they would only bring preexisting 456
pieces together that evolution has separated Nevertheless they could be an important step 457
towards the ambitious goal to design truly novel ldquosynthetic photosynthetic modulesrdquo that 458
contain more efficient substitutes of the ldquofrozen metabolic accidentsrdquo discussed above 459
Ample proof of functionality for in-vivo hybrids (between photosynthesis and 460
previously unconnected metabolic pathways) and in-vitro hybrids (between PSI and biotic or 461
abiotic catalysts) has been obtained but such systems will only be commercially successful if 462
they can compete with established non-biological systems Tailoring of PSI in cyanobacteria 463
where techniques like gene replacement and gene modification are routine may contribute to 464
further improving the efficiency and robustness of in vitro and in vivo hybrids One 465
promising route could be to identify those parts of the original PSI (which evolved under 466
constraints imposed by the cyanobacterial cell) that are necessary for hybrid devices (a 467
ldquominimalrdquo PSI) Such bio-nano systems can be optimized to include novel non-biological 468
components that replace or complement natural pigments andor the protein-based backbone 469
of photosystems going far beyond the limited toolbox of Naturersquos chemistry Such novel 470
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20
systems inspired by natural photosynthesis could be used to engage biologists in the design 471
of fundamentally different types of photosynthesis in living organisms 472
473
SUPPLEMENTAL DATA 474
Supplemental Table 1 Absencepresence of photosynthetic proteins in the three model 475
species Synechocystis PCC6803 (Syn) Chlamydomonas reinhardtii (Cr) and Arabidopsis 476
thaliana (At) 477
478
ACKNOWLEDGMENTS 479
The authors thank Paul Hardy for critical reading of the manuscript 480
481
482
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21
Table 1 Replacement of conserved individual or multiple photosynthetic proteins 483
GeneProtein Description Protein
identity
Reference
psbAD1 Synechocystis D1 was replaced by its homolog from
Poa annua which resulted in slower growth This is
likely to be due to increased charge recombination
between the donor and acceptor sides of the reaction
center
86 Nixon et al
1991
psbBCP47 Synechocystis CP47 was replaced by its homolog
from spinach and photoautotrophy was lost
80 Vermaas et
al 1996
psbCCP43 Synechocystis CP43 was replaced by its homolog
from spinach and photoautotrophy was lost
85 Carpenter et
al 1993
psbHPsbH Synechocystis PsbH was replaced by its counterpart
from maize The resulting strain displayed increased
light sensitivity and lower chlorophyll content
78 Chiaramonte
et al 1999
psaAPsaA Synechocystis PsaA was replaced by its equivalent
from A thaliana This resulted in reduced photo-
autotrophical growth and a drastically reduced
ChlPC ratio
80 Viola et al
2014
psbABCDEF
D1CP47CP43D2
Cyt b559-+
All six core subunits of C reinhardtii were replaced
by their counterparts from two different green algae
(V carteri and S obliquus) The resulting strains
were photoautotrophic but showed reduced
photosynthetic efficiency and the heterologous
82 -
99
Gimpel et al
2016
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22
proteins reached only between 10 and 20 of the
levels of those they replaced
484
485
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23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
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24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
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25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
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26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
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28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
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32
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566
Aigner H Wilson RH Bracher A Calisse L Bhat JY Hartl FU Hayer-Hartl M (2017) 567
Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
chloroplast-ferredoxin-hydrogenase system Proc Natl Acad Sci U S A 70 2317-2320 571
Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
complements ferredoxin deficiency in knocked-down transgenic tobacco plants Plant 574
J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
photosynthesis for energy production Curr Opin Chem Biol 17 457-461 577
Burgdorf T Lenz O Buhrke T van der Linden E Jones AK Albracht SP Friedrich B 578
(2005) [NiFe]-hydrogenases of Ralstonia eutropha H16 modular enzymes for 579
oxygen-tolerant biological hydrogen oxidation J Mol Microbiol Biotechnol 10 181-580
96 581
Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
(2010) Broad band enhancement of light absorption in photosystem I by metal 583
nanoparticle antennas Nano Lett 10 2069-2074 584
Carpenter SD Ohad I Vermaas WF (1993) Analysis of chimeric spinachcyanobacterial 585
CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
the water-splitting system of Photosystem II Biochim Biophys Acta 1144 204-212 587
Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
Eur J Biochem 260 833-843 593
Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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33
Ciornii D Riedel M Stieger KR Feifel SC Hejazi M Lokstein H Zouni A Lisdat F 598
(2017) Bioelectronic Circuit on a 3D Electrode Architecture Enzymatic Catalysis 599
Interconnected with Photosystem I J Am Chem Soc 139 16478-16481 600
Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel 601
genetic diversity Philos Trans R Soc Lond B Biol Sci 372 602
Das R Kiley PJ Segal M Norville J Yu AA Wang L Trammell SA Reddick LE 603
Kumar R Stellacci F Lebedev N Schnur J Bruce BD Zhang S Baldo M (2004) 604
Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
by thermal dissipation of excess energy Biochem Soc Trans 38 651-660 608
Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
device by direct chemical binding of the photosynthetic reaction center protein to 610
metal surfaces Advanced Materials 17 2434-2437 611
Frolov L Rosenwaks Y Richter S Carmeli C Carmeli I (2008) Photoelectric junctions 612
between GaAs and photosynthetic reaction center protein J Phys Chem C 112 613
13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I 617
Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
reinhardtii ACS Synth Biol 5 589-596 624
Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
state biophotovoltaic cells containing photosystem I Adv Mater 26 4863-4869 630
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34
Glowacka K Kromdijk J Kucera K Xie J Cavanagh AP Leonelli L Leakey ADB Ort 631
DR Niyogi KK Long SP (2018) Photosystem II subunit S overexpression increases 632
the efficiency of water use in a field-grown crop Nat Commun 9 868 633
Gnanasekaran T Karcher D Nielsen AZ Martens HJ Ruf S Kroop X Olsen CE 634
Motawie MS Pribil M Moller BL Bock R Jensen PE (2016) Transfer of the 635
cytochrome P450-dependent dhurrin pathway from Sorghum bicolor into Nicotiana 636
tabacum chloroplasts for light-driven synthesis J Exp Bot 67 2495-2506 637
Haniewicz P Abram M Nosek L Kirkpatrick J El-Mohsnawy E Olmos JDJ Kouřil 638
R Kargul JM (2018) Molecular mechanisms of photoadaptation of photosystem I 639
supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
harvesting chlorophyll ab-binding protein in Synechocystis sp PCC 6803 Eur J 643
Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
synthase is a highly divergent paralog of PsbA of photosystem II Science 353 646
Holt NE Fleming GR Niyogi KK (2004) Toward an understanding of the mechanism of 647
nonphotochemical quenching in green plants Biochemistry 43 8281-8289 648
Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
D Kamachi T Okura I (2006a) Light-driven hydrogen production by a hybrid 650
complex of a [NiFe]-hydrogenase and the cyanobacterial photosystem I Photochem 651
Photobiol 82 676-682 652
Ihara M Nakamoto H Kamachi T Okura I Maeda M (2006b) Photoinduced hydrogen 653
production by direct electron transfer from photosystem I cross-linked with 654
cytochrome c3 to [NiFe]-hydrogenase Photochem Photobiol 82 1677-1685Janna 655
Olmos JD Kargul J (2015) A quest for the artificial leaf Int J Biochem Cell Biol 656
66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
Pawlak D Kargul J (2017) Biofunctionalisation of p-doped silicon with cytochrome 659
c553 minimises charge recombination and enhances photovoltaic performance of the 660
all-solid-state photosystem I-based biophotoelectrode RSC Adv 7 47854-47866 661
Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations 662
ACS Chem Biol 6 533-539 663
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35
Jensen PE Leister D (2014) Chloroplast evolution structure and functions F1000Prime 664
Rep 6 40 665
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip 666
functionalization of carbon nanotubes with photosystem I J Am Chem Soc 132 667
2872-2873 668
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and 669
its application in biomimetic solar-to-fuel systems J Plant Physiol 169 1639-1653 670
Kargul J Bubak G Andryianau G (2018) Biophotovoltaic systems based on 671
photosynthetic complexes In Wandelt K (Ed) Encyclopedia of Interfacial 672
Chemistry Surface Science and Electrochemistry vol 7 pp 43-63 673
Kim YS Hara M Ikebukuro K Miyake J Ohkawa H Karube I (1996) Photo-induced 674
activation of cytochrome P450reductase fusion enzyme coupled with spinach 675
chloroplasts Biotechnol Tech 10 717minus720 676
Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic 677
hydrogen production by a hybrid complex of photosystem I and [NiFe]-hydrogenase 678
ACS Nano 3 4055-4061 679
Kromdijk J Glowacka K Leonelli L Gabilly ST Iwai M Niyogi KK Long SP (2016) 680
Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
Kubota H Sakurai I Katayama K Mizusawa N Ohashi S Kobayashi M Zhang P Aro 683
EM Wada H (2010) Purification and characterization of photosystem I complex 684
from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim 685
Biophys Acta 1797 98-105 686
Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future 702
by engineering crop photosynthesis and yield potential Cell 161 56-66 703
Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
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Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
production Biochemistry 49 10264-10266 713
Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
organisms using whole-cell and cell-free systems Appl Biochem Biotechnol 183 715
503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
hydrogenases J Biochem 123 644-649 718
Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
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biosynthesis ACS Chem Biol 11 1862-1869 721
Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous 722
enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
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molecular wire gold nanoparticle and double surfactants in water Chem Commun 726
(Camb) 46 2557-2559 727
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
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37
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Mullineaux CW Emlyn-Jones D (2005) State transitions an example of acclimation to 733
low-light stress J Exp Bot 56 389-393 734
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J 735
Nanosci Nanotechnol 9 1709-1713 736
Nguyen K Bruce BD (2014) Growing green electricity progress and strategies for use of 737
photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello 742
Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in 748
understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in 750
Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
complex Plant Cell 3 383-395 752
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
S Cazzaniga S Bassi R (2015) Heterologous expression of moss light-harvesting 764
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38
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24340-24354 767
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins 768
Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
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Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
natural product biosynthesis Protoplasma 253 1197-1209 774
Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS 775
Lett 581 2768-2775 776
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3619-3639 782
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2189 785
Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS 786
Protein Increases Electron Transport Rates and Biomass Yield Plant Physiol 175 787
134-145 788
Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J 789
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Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
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Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N 803
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tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050 805
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
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photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
Photosystem I-catalyst hybrids Curr Opin Chem Biol 25 1-8 815
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Synechocystis sp PCC 6803 carrying spinach sequences Construction and function 817
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Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
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Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
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40
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843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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Ihara M Nakamoto H Kamachi T Okura I Maeda M (2006b) Photoinduced hydrogen production by direct electron transfer fromphotosystem I cross-linked with cytochrome c3 to [NiFe]-hydrogenase Photochem Photobiol 82 1677-1685Janna Olmos JD Kargul J(2015) A quest for the artificial leaf Int J Biochem Cell Biol 66 37-44
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Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) Anchoring a plant cytochrome P450 via PsaM tothe thylakoids in Synechococcus sp PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184
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Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous enzymes the role of electron carrierproteins Photosynth Res 134 329-342
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
4
enable us to utilize the reducing power of the light reactions directly to produce large 75
amounts of high-value compounds in vivo (3) The high efficiency and robustness of PSI 76
should allow it to be used in hybrids with biotic or abiotic components to generate hydrogen 77
simple carbon-based solar fuels or electricity in vitro In this review the background to and 78
recent developments in these three strategies are discussed 79
80
Natural building blocks of photosynthesis 81
During photosynthesis carbon dioxide (CO2) is converted into organic compounds 82
principally sugars using sunlight as energy In plants algae and cyanobacteria 83
photosynthesis uses water as the electron donor for chemical reduction of CO2 and releases 84
oxygen Algae and plants derive from a lineage that arose from an endosymbiotic relationship 85
between a protist and a cyanobacterium Chloroplasts the photosynthetic organelles in 86
modern plants are in fact the descendants of this ancient symbiotic cyanobacterium and 87
possess an internal membrane system that resembles the thylakoid membranes of modern-day 88
cyanobacteria Indeed during the evolutionary transition from cyanobacteria to chloroplasts 89
the overall organization and mode of action of the photosynthetic machinery was retained 90
(Box 1) However significant changes have occurred in the subunit composition of 91
photosystems (Fig 1) their posttranslational modification (Pesaresi et al 2011) the 92
harvesting of light energy pigment composition and regulation of photosynthesis (Box 93
2)(Mullineaux and Emlyn-Jones 2005 Rochaix 2007 Holt et al 2004 de Bianchi et al 94
2010) 95
Its evolutionary history makes photosynthesis well-suited for synthetic biology 96
strategies The evolutionary diversification of the photosynthetic machinery has provided a 97
set of building blocks ranging from single proteins such as the soluble electron transporters 98
(plastocyanin cytochrome c6 flavodoxin and ferredoxin) to multiprotein complexes like 99
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5
photosystems and antenna complexes (phycobiliosomes and light-harvesting complexes 100
(LHCs)) In principle the building blocks should be interchangeable between cyanobacteria 101
algae and plants Instances of the swapping of homologous photosynthetic proteins between 102
species by means of genetic engineering are discussed in the next section to highlight the 103
complications associated with apparently straightforward approaches The focus then shifts to 104
genuinely synthetic approaches in which specific photosynthetic building blocks have been 105
introduced into photosynthetic species that lack them In the subsequent two sections the 106
combination of non-photosynthetic (Bio-bio hybrids using photosynthesis as an electron 107
source for unrelated biological processes) and non-biological building blocks (Bio-nano 108
hybrids using photosynthesis as an electron source for non-biological processes) with 109
components of the photosynthetic machinery are described An overview of these approaches 110
is provided in Figure 2 111
112
Exchange of conserved photosynthetic modules 113
Theoretically it should be relatively easy to exchange individual conserved photosynthetic 114
proteins between different species even in such distantly related organisms as cyanobacteria 115
and plants However in practice these simple genetic engineering exercises can be 116
problematic (Table 1) Several individual proteins from cyanobacterial PSII (D1 CP43 and 117
PsbH) and PSI (PsaA) have indeed been genetically replaced by their plant counterparts with 118
varying success Synechocystis strains expressing the D1 protein from Poa annua or PsbH 119
from maize (Zea mays) could still perform photosynthesis ndash albeit with less efficiency than 120
the WT strain (Nixon et al 1991 Chiaramonte et al 1999) ndash but replacement of 121
Synechocystis CP43 or CP47 by their homologs from spinach (Spinacia oleracea) was 122
incompatible with photoautotrophy (Carpenter et al 1993 Vermaas et al 1996) Similarly 123
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6
in Synechocystis strains equipped with Arabidopsis thaliana PsaA PSI function was severely 124
disrupted (Viola et al 2014) 125
Such complications resulting from the replacement of core subunits of photosystems 126
despite their high similarity (78ndash86 identity between the cyanobacterial and plant proteins 127
Table 1) reflect the so-called ldquofrozen metabolic staterdquo of the photosynthetic multiprotein 128
complexes This term was coined by Gimpel et al (2016) but was originally introduced as 129
ldquofrozen metabolic accidentrdquo by Shi et al (2005) The ldquofrozen metabolic accidentrdquo concept 130
refers to the observation that selection has not significantly altered biophysically and 131
physiologically inefficient photosynthetic proteins (including the D1 protein of PSII or 132
RuBisCO of the Calvin-Benson cycle) over billions of years of evolution In fact 133
bioinformatic analysis of photosynthetic cyanobacterial genes suggests that the evolution rate 134
of proteins at the core of the photosynthetic apparatus is highly constrained by protein-135
protein protein-lipid and protein-cofactor interactions (Shi et al 2005) This provides an 136
internal selection pressure conserving the sequence of proteins in photosynthetic 137
multiprotein complexes and ndash in case of prokaryotes ndash also the genomic organization of their 138
genes (Shi et al 2005) The term ldquofrozen metabolic accidentrdquo was generalized to ldquofrozen 139
metabolic staterdquo by Gimpel et al (2016) and implies that in each photosynthetic species 140
slightly distinct modules of the cores of photosynthetic multiprotein complexes have evolved 141
that are optimized with respect to their intrinsic interactions and that rarely tolerate the 142
alteration of single proteins by exchange or mutation In consequence the simultaneous 143
exchange of entire sets of core proteins (or ldquomodulesrdquo) with all their intrinsic interactions 144
should be more feasible than substituting individual proteins that may disrupt the ldquofrozen 145
metabolic staterdquo Such an experiment has been performed in the green alga Chlamydomonas 146
reinhardtii where the six PSII core proteins D1 CP47 CP43 D2 Cyt b559- and were 147
swapped for their homologs from two other green algal species (Gimpel et al 2016) 148
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7
Photoautotrophy was not affected by the exchange of this synthetic biology module although 149
the fully altered strains performed suboptimally compared to strains in which only 1ndash5 genes 150
were exchanged However in control experiments where the synthetic C reinhardtii six-gene 151
module was re-introduced to the C reinhardtii deletion strain that lacked all six genes only 152
about 86 of wild-type PSII functionality was rescued Tentative explanations for this 153
decreased efficiency include (i) off-target effects of the PSII gene deletions on the operon 154
components and tRNA genes associated with these PSII loci (ii) misregulation of the 155
transferred PSII genes because their expression cassettes lacked unidentified cis-acting DNA 156
elements and (iii) perturbation of polycistron-dependent post-transcriptional regulation of the 157
transformed genes since they were no longer part of an operon (Gimpel et al 2016) 158
Taken together the outcomes of these replacement experiments indicate that 159
exchanging conserved photosynthetic proteins from multiprotein complexes can be 160
problematic given the highly integrated nature of the photosynthetic machinery Therefore 161
approaches designed to enhance photosynthesis such as introducing the high-light-resistant 162
D1 protein from a green alga that lives under extreme conditions (Treves et al 2016) into 163
crop plants do not appear promising Instead entire (sub)complexes with their internal 164
network of evolutionarily optimized interactions should be transferable between species 165
166
Exchange of non-conserved photosynthetic modules 167
Inspection of the repertoire of subunits of the photosynthetic machinery in the three model 168
species Synechocystis PCC6803 C reinhardtii and A thaliana which represent different 169
stages in the evolution of oxygen-generating photosynthesis shows that the most dramatic 170
changes in the photosynthetic proteome occurred during the transition from the 171
cyanobacterial endosymbiont (for which Synechocystis serves as a proxy) to the chloroplast 172
of unicellular algae (with C reinhardtii as proxy) (Fig 3 Supplemental Table 1) In 173
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8
particular phycobilisomes flavodoxin and several photosystem subunits were lost while 174
LHCs some novel photosystem subunits and several proteins involved in alternative electron 175
pathways or photoprotection evolved During the transition from algal chloroplasts to those 176
of flowering plants relatively few proteins were lost (eg flavodiiron proteins and the 177
canonical cytochrome c6) or acquired (Lhcb6CP24) (Fig 3 Supplemental Table 1) The 178
NAD(P)H dehydrogenase (NDH) complex involved in antimycin A-insensitive cyclic 179
electron flow (see Box 1) is a special case since the chloroplast NDH from flowering plants 180
traces back to the cyanobacterial complex but the complex was lost during evolution in C 181
reinhardtii (Fig 3 Supplemental Table 1) 182
Several attempts have been made to introduce photosynthetic proteins into species 183
that lack the corresponding homolog (Table 2) These heterologous expression approaches 184
have been successful for the soluble electron transporters flavodoxin cytochrome c6 and 185
flavodiiron proteins Indeed cyanobacterial flavodoxin can at least partially replace plant 186
ferredoxin and confer enhanced stress tolerance when expressed in addition to ferredoxin 187
(Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011) Similarly red algal 188
cytochrome c6 enhances growth and photosynthesis of A thaliana plants (Chida et al 2007) 189
Since A thaliana lacks a functional cytochrome c6 that can transfer electrons from the Cyt b6f 190
complex to PSI (Molina-Heredia et al 2003 Weigel et al 2003) it is plausible that the 191
more oxidized plastoquinone pool in the transgenic plants is a direct consequence of 192
additional PSI reduction mediated by the algal protein (Chida et al 2007) Interestingly it 193
seems to make no difference if an endogenous soluble electron transport protein (see Box 3) 194
or its heterologous equivalent from a distant species is overexpressed For instance 195
overexpression of the endogenous soluble proteins plastocyanin and ferredoxin can also 196
enhance growth in plants (Pesaresi et al 2009 Lin et al 2013 Chang et al 2017 Zhou et 197
al 2018) Interestingly and rather unexpectedly this concept can also work for certain 198
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
9
proteins that are part of multiprotein complexes (Simkin et al 2017 see Box 3) This 199
indicates that the quantity of such proteins is relevant for growth enhancement and not its 200
evolutionary origin 201
More recently the two Physcomitrella patens flavodiiron protein (FLV) genes FlvA 202
and FlvB were introduced into A thaliana which like other angiosperms has lost FLVs 203
during evolution (Yamamoto et al 2016) FLVs are the main mediators of pseudo-cyclic 204
electron flow in photosynthetic organisms but heterologous expression of FLVs in A 205
thaliana had no effect on steady-state photosynthesis and growth of the transgenic plants 206
(Yamamoto et al 2016) However the Arabidopsis FLV lines displayed higher 207
photosynthetic yields just after the onset of actinic light following a long dark adaptation 208
suggesting that the FLVs mediated a large electron sink during the induction of 209
photosynthesis In fluctuating light experiments the Arabidopsis FLV lines had much less 210
PSI acceptor side limitation implying that the large FLV-mediated electron sink makes 211
photosynthesis more resistant to the fluctuating light Consequently this protective effect of 212
FLVs is more pronounced in Arabidopsis lines that are more sensitive to fluctuating light like 213
the pgr5 mutant defective in antimycin A-sensitive cyclic electron flow (see Box 1 Leister 214
and Shikanai 2013 Yamamoto et al 2016) Similarly expression of FLVs in a rice (Oryza 215
sativa) line with markedly reduced cyclic electron flow restored CO2 assimilation and growth 216
rate to wild-type levels (Wada et al 2018) Like FLVs LHcxLHCSR proteins play a role in 217
photoprotection in green algae and mosses but have been lost in angiosperms during 218
evolution Heterologous expression of P patens LHCSR1 in Nicotiana benthamiana and 219
Nicotiana tabacum yielded an active protein that has properties similar if not identical to 220
those of moss LHCSR1 (Pinnola et al 2015) 221
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
10
Efforts to create LHCII complexes like those in plants by heterologously expressing 222
the membrane-spanning light-harvesting chlorophyll ab-binding protein Lhcb from Pisum 223
sp (pea) in Synechocystis were unsuccessful 224
Although the pea Lhcb protein was synthesized in Synechocystis and integrated into 225
the membrane it did not accumulate to steady-state levels detectable by immunoblot analysis 226
(He et al 1999) Possible explanations are that Lhcb is rapidly degraded either because its 227
ldquounfamiliarrdquo structure makes it a good substrate for the cyanobacterial proteolytic system or 228
it cannot foldassemble properly due to the lack of plant-specific pigments or assembly 229
factors Interestingly chlorophyll b production (see Box 2) after introduction of plant 230
chlorophyll a oxygenase (CAO) is boosted when Lhcb is expressed even though LHCII does 231
not accumulate in detectable amounts (Xu et al 2001) 232
Even soluble multiprotein complexes can be heterologously expressed as has been 233
impressively demonstrated from the carbon-fixation end of photosynthesis For example by 234
coexpression of five auxiliary factors a functional plant RuBisCo complex was successfully 235
assembled in Escherichia coli (Aigner et al 2017) This result is in line with the ldquofrozen 236
metabolic staterdquo concept showing that photosynthetic proteins embedded in a network of 237
interactions with other proteins and auxiliary factors can be introduced into distantly related 238
species but only with their own interaction networks While Gimpel et al (2016) showed that 239
efficient gene expression needs to be accounted for when designing synthetic modules for the 240
transfer of photosystem subunits from one species to another Aigner et al (2017) 241
demonstrated that auxiliary factors required for the biogenesis of photosynthetic 242
(sub)complexes need to be considered in such experiments adding additional facets to the 243
ldquofrozen metabolic staterdquo concept 244
Auxiliary factors required for the accumulation of photosynthetic multiprotein 245
complexes include (i) cofactors like iron-sulfur clusters and pigments (see Box 2) (ii) 246
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11
chaperones that are required for the insertion of co-factors (eg pigments into LHCs Schmid 247
2008) and (iii) assembly factors Assembly factors are required to support the stepwise 248
assembly and functionality of the multiproteinpigment complexes and many of these are 249
conserved between photosynthetic species (Nixon et al 2010 Nickelsen and Rengstl 2013 250
Jensen and Leister 2014) Therefore the exchange of entire multiprotein complexes between 251
distantly related species will not be simple due to the repertoire of auxiliary factors that has 252
markedly changed during evolution Since the species that Gimpel et al (2016) studied were 253
closely related this aspect could be neglected In consequence the impact of these auxiliary 254
factors on the formation of multiproteinpigment complexes will have to be fully elucidated 255
to understand which factors are sufficient to assemble a photosynthetic multiprotein complex 256
previous (genetic) approaches only identified factors required for this process Hence the 257
transfer of entire photosynthetic (sub)complexes between distantly related species by a 258
ldquosynthetic photosynthetic modulerdquo must include entire sets of strongly interacting proteins (to 259
address the ldquofrozen metabolic staterdquo) as well as all genetic elements and auxiliary factors 260
sufficient for efficient expression biogenesis and function of the proteins in the module 261
262
Bio-bio hybrids using photosynthesis as an electron source for unrelated biological 263
processes 264
The idea of using the reducing power of photosynthesis to drive unrelated metabolic reactions 265
has inspired several biotechnological concepts The photosynthesis-driven formation of 266
secondary metabolites has been demonstrated in vivo whereas light-driven generation of H2 267
by bio-bio hybrids so far works only in vitro and is closely related to bio-nano approaches 268
Therefore coupling of photosynthesis to previously unrelated pathways is discussed here 269
first followed by bio-bio systems for H2 generation 270
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12
Redirection of PSI reducing equivalents to drive reactions catalyzed by cytochrome 271
P450 enzymes has been achieved in vivo by genetic modifications of plants and 272
cyanobacteria (Lassen et al 2014a Nielsen et al 2016 Mellor et al 2017) Cytochrome 273
P450s constitute the largest family of plant enzymes that acts on various endogenous and 274
xenobiotic molecules (Rasool and Mohamed 2016) Their extreme versatility and 275
irreversibility of catalyzed reactions make these enzymes very attractive for use in 276
biotechnology medicine and phytoremediation P450s are monooxygenases that insert an 277
oxygen atom into hydrophobic molecules which enhances their reactivity and hydrophilicity 278
Most eukaryotic P450s require NADPHcytochrome P450 reductase as the electron donor 279
The ER membrane is generally accepted to be the primary subcellular repository of 280
eukaryotic P450s and their NADPHcytochrome P450 reductase By relocating cytochrome 281
P450s to the chloroplasts the reducing power of photosynthesis can be directly targeted to 282
the reactions catalyzed by these enzymes thus providing the basis for the large-scale 283
production of valuable products Initial attempts to couple P450s with photosynthesis were 284
conducted in vitro (Table 3 Fig 4A) Spinach chloroplasts were combined with microsomes 285
from yeast cells that had been stably transformed with a fusion gene expressing the rat 286
CYP1A1-NADPHcytochrome P450 reductase fusion enzyme (Kim et al 1996) These 287
experiments confirmed that it is feasible to drive P450-mediated reactions using electrons 288
derived from photosynthetically generated NADPH Intriguingly the NADPHcytochrome 289
P450 reductase is not always essential as demonstrated by co-incubating CYP79A1 from 290
sorghum (Sorghum bicolor) with barley (Hordeum vulgare) PSI and employing ferredoxin to 291
directly deliver electrons from PSI to the P450 (Jensen et al 2011) This approach was also 292
shown to be practicable in vivo CYP79A1 either alone or in combination with CYP71E1 293
and the UDP-glucosyltransferase UGT85B1 was first targeted in vivo to cyanobacterial or 294
plant thylakoid membranes where they catalyzed the same reactions as in their original 295
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13
cellular compartment (the ER) utilizing photosynthetically reduced ferredoxin as the electron 296
donor (Nielsen et al 2013 Lassen et al 2014b Gnanasekaran et al 2016 Wlodarczyk et 297
al 2016) Genetic fusions have also been employed for the coupling of P450s to PSI 298
CYP79A1 has been fused to either cyanobacterial PsaM or Arabidopsis ferredoxin and the 299
engineered enzyme showed light-driven activity both in vivo and in vitro (Lassen et al 300
2014b Mellor et al 2016) In the latter case the efficiency of the system was enhanced 301
because the fusion could compete better with endogenous electron sinks coupled to metabolic 302
pathways (Mellor et al 2016) 303
In contrast to PSI-P450 hybrids PSI-hydrogenase hybrids currently function only in 304
vitro Unlike fossil fuels H2 is environmentally benign as it produces only water when 305
combusted Therefore in principle harnessing of the reducing power of photosynthesis for 306
the direct production of H2 (ie ultimately using sunlight and water) would yield a fully 307
sustainable system of energy generation PSI but not PSII provides a standard midpoint 308
potential that is sufficiently negative to power the reduction of protons to H2 (Utschig et al 309
2015) Hence approaches have been developed to engineer PSI to produce H2 either as 310
replacement or in addition to its natural product NADPH (see Figure 1 in Box 1) by 311
redirecting PSI electrons to a catalytic component This catalytic component can be abiotic or 312
biotic (hydrogenases) The feasibility of coupling H2 generation to photosynthesis was 313
demonstrated 45 years ago by mixing chloroplast preparations with ferredoxin and 314
hydrogenase (Benemann et al 1973) Twenty-five years later hydrogen evolution by direct 315
electron transfer (without ferredoxin) from PSI to hydrogenases was accomplished for the 316
first time (McTavish 1998) 317
Hydrogenases catalyze the reversible interconversion of H2 into protons and electrons 318
and are widespread in nature they occur in bacteria and archaea but also in some eukarya In 319
vivo hydrogenases can mediate photosynthetic H2 production albeit mostly indirectly or 320
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14
under anaerobic conditions due to their oxygen sensitivity (Ghirardi 2015 Oey et al 2016) 321
Hydrogenases can be classified according to their metal-ion composition eg [NiFe] and 322
[FeFe] hydrogenases (Lubitz et al 2014 Martin and Frymier 2017) [FeFe] hydrogenases 323
preferentially catalyze proton reduction and can evolve H2 at high rates but are extremely 324
sensitive to O2 and are the only type of hydrogenases found in eukaryotic microorganisms 325
[NiFe] hydrogenases are less sensitive to O2 but preferentially oxidize H2 under 326
physiological conditions (Lubitz et al 2014) In vitro both types of hydrogenases have been 327
directly linked to PSI (Table 3 Fig 4B) PSI-[NiFe] hydrogenase complexes have been 328
generated by fusing the hydrogenase genetically to the PsaE protein (Ihara et al 2006a) PSI-329
[FeFe] hydrogenase complexes were obtained by genetically fusing the hydrogenase to 330
ferredoxin (Yacoby et al 2011) or covalently linking the FeS clusters present in the 331
hydrogenase to PSI via a molecular wire (Lubner et al 2010 Lubner et al 2011) 332
Two parameters characterize the efficiency of these in-vitro systems their H2 333
production rate and longevity While low rates of H2 production (in the range from 01 to 10 334
μmol H2mg chlorophyllh) were described for the early chloroplast extract experiments and 335
genetic fusions of PSI to [NiFe] or [FeFe] hydrogenases (McTavish 1998 Ihara et al 2006a 336
Yacoby et al 2011) higher rates of between 2000 and 3000 μmol H2mg chlorophyllh have 337
been achieved with wired PSI-[FeFe] hydrogenase complexes and genetically fused PSI-338
[NiFe] hydrogenase complexes assembled on a gold electrode (Krassen et al 2009 Lubner 339
et al 2011) Few data are available with respect to the longevity of the PSI-hydrogenase 340
systems however a minimum lifetime of 64 days was reported for a wired [FeFe] 341
hydrogenase-PSI complex at room temperature and under ambient illumination (Lubner et 342
al 2010) 343
The future use of hydrogenases in photosynthesis-driven H2 production will strongly 344
depend on whether or not it is possible to overcome the O2 sensitivity of many hydrogenases 345
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15
by for instance employing oxygen-tolerant [NiFe] hydrogenases (Burgdorf et al 2005 346
Schiffels et al 2013) If this is not possible their efficient use in vivo in thylakoids which 347
inevitably generate O2 during linear electron flow will be impossible However as 348
demonstrated with the gold surface system (Krassen et al 2009) the design of novel 349
matrices into which the hybrid system can be incorporated may markedly enhance the 350
efficiency 351
352
Bio-nano hybrids Use of photosynthesis as a source of electrons for non-biological 353
processes 354
From bio-bio hybrids it is only a small step to developing bio-nano hybrids as demonstrated 355
by PSI hybrids that employ abiotic catalysts for photosynthetic hydrogen production instead 356
of hydrogenase In fact abiotic catalysts have the advantage of bypassing the lability of 357
hydrogenases in the presence of oxygen PSI-platinum hybrids have been produced by 358
combining PSI with platinum nanoparticles (either directly or via tethering by nanowires) or 359
platinum nanoclusters (Kargul et al 2012 Fukuzumi 2015 Utschig et al 2015) (Fig 5A 360
Table 4) Current PSI-platinum hybrids are less efficient than the most advanced PSI-361
hydrogenase systems but are extremely robust (Utschig et al 2015) However future 362
widespread usage of the PSI-platinum system will be limited by the high cost of platinum A 363
more economical alternative to precious metals are earth-abundant molecular catalysts 364
However hybrids consisting of PSI and earth-abundant molecular catalysts have a much 365
shorter working life than platinum-based configurations (Utschig et al 2015) likely due to 366
instability of the molecular catalyst 367
PSI-based photocurrent-producing devices constitute another class of photosynthesis-368
derived nano-bio systems (Table 4 Fig 5) In such devices PSI is immobilized onto 369
electrodes Many variants of this concept have been tested such as varying the electrode 370
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16
materials immobilizationorientation strategies andor artificial redox mediators (Nguyen and 371
Bruce 2014 Janna Olmos and Kargul 2015 Plumereacute and Nowaczyk 2017 Kargul et al 372
2018) PSI must be immobilized on the electrode surface in such a way that electron transfers 373
between the electrodes and the oxidizing (P700) and reducing (FB - the terminal [4Fe-4S] 374
cluster or an intermediate electron transporter) sites of PSI can proceed with the required 375
efficiency Electrons are transferred between the electrodes and the oxidizing or reducing 376
sides of PSI either by a diffusible redox mediator or molecular wires Examples of electrode 377
materials and redox mediators are provided in Table 4 After P700 photo-excitation electrons 378
are transferred from P700 via several factors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB) to the 379
iron-sulfur cluster FB (see legend of Box 1) As in the case of PSI-hydrogenase and PSI-380
platinum nanoparticles PSI can be wired to its electrodes This has been achieved by wiring 381
the A1 cofactor (phylloquinone) to the substrate surface such that electrons are directly 382
transferred from A1 to the electrode thus bypassing the downstream FeS clusters (FX FA FB) 383
in the stromal domain of PSI (Terasaki et al 2007 Miyachi et al 2009 Terasaki et al 384
2009 Miyachi et al 2010) 385
Modifications of PSI have been utilized to enhance the efficiency of the photocurrent-386
generating system (Das et al 2004 Frolov et al 2005 Carmeli et al 2010) As mentioned 387
previously fusions to the stroma-faced PSI subunit PsaE can be used to link new components 388
to PSI however in this case PsaD fusions were used To this end recombinant His-tagged 389
PsaD was immobilized on the functionalized electrode surface which was then exposed to 390
native PSI complexes resulting in immobilized PSI with P700 facing away from the 391
electrode (Das et al 2004) Another way to control the orientation of PSI during 392
immobilization involves introducing cysteine mutations To allow for direct thiol coupling to 393
an Au surface various residues on the lumen-exposed face of PSI were replaced by cysteine 394
and tested (Frolov et al 2005) PSI attachment was achieved with all single mutants even 395
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17
those placed further from the P700 site suggesting that a specific location is not required as 396
long as the cysteine is exposed at the luminal surface of PSI The concept of targeted 397
attachment via introduced cysteine residues was exploited in subsequent studies to link PSI to 398
maleimide-functionalized gallium arsenide (Frolov et al 2008) to immobilize PSI between 399
the substrate and a metallized scanning near-field optical microscopy tip (Gerster et al 400
2012) and to bind PSI to carbon nanotubes (Kaniber et al 2010) Another modification of 401
PSI is represented by the attachment of plasmonic metal nanoparticles which resulted in 402
enhanced light absorption (Carmeli et al 2010) even in the green part of the solar spectrum 403
that is not normally absorbed (Szalkowski et al 2017) This suggests that it is possible to 404
enhance light absorption by PSI in vitro through the attachment of abiotic components that 405
act as optical antennae to extend the spectrum of photons available for P700 activation 406
Taken together these efforts demonstrate that PSI-based photocurrent-generating 407
systems are still in an exploratory phase with many variants under development In the next 408
phase viable building blocks and reference systems should be established that can serve as 409
starting points for the systematic engineering of superior systems This will require the 410
modification of PSI for optimal effect in artificial systems and will undoubtedly differ 411
substantially from the original environment in which PSI was molded by biological 412
evolution 413
414
Concluding remarks and outlook 415
Enhancing photosynthesis and growth can be achieved by a simple overexpression of certain 416
photosynthetic proteins and PSI can be coupled to previously unconnected biotic or abiotic 417
components to generate valuable compounds hydrogen or electricity Moreover entire 418
photosynthetic complexes can be functionally expressed in distantly related species (as 419
demonstrated for RuBisCO Aigner et al 2017) Thus what are the next goals and which 420
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18
challenges need to be overcome Two challenges for the in vivo systems are obvious (i) 421
enhancing the efficiency of in-vivo bio-bio hybrids and (ii) upscaling the size of ldquosynthetic 422
photosynthetic modulesrdquo to cover entire photosystems or complex antenna systems 423
With respect to the enhancement of in vivo cyanobacterial and algal systems 424
harboring hybrid configurations in which photosynthesis directly drives previously 425
unconnected pathways the use of laboratory evolution offers a unique opportunity to tailor 426
these systems for their intended purpose Laboratory evolution utilizes the high rate of 427
evolution typical in microbial systems (in particular if suitable selection conditions can be 428
designed) to fine tune and optimize processes through selection of advantageous genetic 429
variation While this strategy has been employed in E coli and yeast with impressive success 430
now photosynthetic microbial systems are emerging as attractive targets for this approach 431
(Leister 2017) 432
The exchange of entire multiprotein complexes between distantly related species will 433
not be a simple exercise because the ldquofrozen metabolic staterdquo of the core photosynthetic 434
complexes will necessitate the exchange of major parts of photosystems rather than 435
individual subunits The RuBisCO case study by Aigner et al (2017) represents of promising 436
proof of principle but one needs to consider that the synthetic RuBisCO module comprised 437
only the two different subunits present in the mature complex and five auxiliary factors for its 438
assembly Entire photosystems will require much larger ldquosynthetic photosynthetic modulesrdquo 439
and many of the auxiliary factors have not been identified yet Therefore when designing 440
these complex ldquosynthetic photosynthetic modulesrdquo we will identify the set of components 441
that are sufficient (and not only necessary) to drive photosynthesis providing an 442
unprecedentedly deep understanding of this fundamental and complex process 443
Given that the problems described above can be solved what will be the next steps in 444
the synthetic biology of the light reactions of photosynthesis The combination of ldquosynthetic 445
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19
photosynthetic modulesrdquo from diverse species could allow the design of novel variants of 446
photosynthesis Numerous instances of such ldquorecombined photosynthetic variantsrdquo can be 447
imagined including plants that employ cyanobacteria-derived phycobilisomes for highly 448
sufficient photosynthesis under low light conditions cyanobacteria that employ plant-derived 449
LHCs as antenna to shift light saturation of photosynthesis to higher intensities or the 450
integration of cyanobacterial Chl d and Chl f (which can absorb far-red and near infra-red 451
light) into algal or plant photosynthesis to expand the spectral region available to drive 452
photosynthesis (Loughlin et al 2013 Ho et al 2016) Moreover such variants of 453
recombined photosynthesis could be further optimized by laboratory evolution within a 454
suitable microbial chassis However such recombined photosynthetic variants cannot be 455
considered a truly novel type of photosynthesis because they would only bring preexisting 456
pieces together that evolution has separated Nevertheless they could be an important step 457
towards the ambitious goal to design truly novel ldquosynthetic photosynthetic modulesrdquo that 458
contain more efficient substitutes of the ldquofrozen metabolic accidentsrdquo discussed above 459
Ample proof of functionality for in-vivo hybrids (between photosynthesis and 460
previously unconnected metabolic pathways) and in-vitro hybrids (between PSI and biotic or 461
abiotic catalysts) has been obtained but such systems will only be commercially successful if 462
they can compete with established non-biological systems Tailoring of PSI in cyanobacteria 463
where techniques like gene replacement and gene modification are routine may contribute to 464
further improving the efficiency and robustness of in vitro and in vivo hybrids One 465
promising route could be to identify those parts of the original PSI (which evolved under 466
constraints imposed by the cyanobacterial cell) that are necessary for hybrid devices (a 467
ldquominimalrdquo PSI) Such bio-nano systems can be optimized to include novel non-biological 468
components that replace or complement natural pigments andor the protein-based backbone 469
of photosystems going far beyond the limited toolbox of Naturersquos chemistry Such novel 470
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20
systems inspired by natural photosynthesis could be used to engage biologists in the design 471
of fundamentally different types of photosynthesis in living organisms 472
473
SUPPLEMENTAL DATA 474
Supplemental Table 1 Absencepresence of photosynthetic proteins in the three model 475
species Synechocystis PCC6803 (Syn) Chlamydomonas reinhardtii (Cr) and Arabidopsis 476
thaliana (At) 477
478
ACKNOWLEDGMENTS 479
The authors thank Paul Hardy for critical reading of the manuscript 480
481
482
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21
Table 1 Replacement of conserved individual or multiple photosynthetic proteins 483
GeneProtein Description Protein
identity
Reference
psbAD1 Synechocystis D1 was replaced by its homolog from
Poa annua which resulted in slower growth This is
likely to be due to increased charge recombination
between the donor and acceptor sides of the reaction
center
86 Nixon et al
1991
psbBCP47 Synechocystis CP47 was replaced by its homolog
from spinach and photoautotrophy was lost
80 Vermaas et
al 1996
psbCCP43 Synechocystis CP43 was replaced by its homolog
from spinach and photoautotrophy was lost
85 Carpenter et
al 1993
psbHPsbH Synechocystis PsbH was replaced by its counterpart
from maize The resulting strain displayed increased
light sensitivity and lower chlorophyll content
78 Chiaramonte
et al 1999
psaAPsaA Synechocystis PsaA was replaced by its equivalent
from A thaliana This resulted in reduced photo-
autotrophical growth and a drastically reduced
ChlPC ratio
80 Viola et al
2014
psbABCDEF
D1CP47CP43D2
Cyt b559-+
All six core subunits of C reinhardtii were replaced
by their counterparts from two different green algae
(V carteri and S obliquus) The resulting strains
were photoautotrophic but showed reduced
photosynthetic efficiency and the heterologous
82 -
99
Gimpel et al
2016
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22
proteins reached only between 10 and 20 of the
levels of those they replaced
484
485
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23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
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24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
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25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
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26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
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28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
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32
References 565
566
Aigner H Wilson RH Bracher A Calisse L Bhat JY Hartl FU Hayer-Hartl M (2017) 567
Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
chloroplast-ferredoxin-hydrogenase system Proc Natl Acad Sci U S A 70 2317-2320 571
Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
complements ferredoxin deficiency in knocked-down transgenic tobacco plants Plant 574
J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
photosynthesis for energy production Curr Opin Chem Biol 17 457-461 577
Burgdorf T Lenz O Buhrke T van der Linden E Jones AK Albracht SP Friedrich B 578
(2005) [NiFe]-hydrogenases of Ralstonia eutropha H16 modular enzymes for 579
oxygen-tolerant biological hydrogen oxidation J Mol Microbiol Biotechnol 10 181-580
96 581
Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
(2010) Broad band enhancement of light absorption in photosystem I by metal 583
nanoparticle antennas Nano Lett 10 2069-2074 584
Carpenter SD Ohad I Vermaas WF (1993) Analysis of chimeric spinachcyanobacterial 585
CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
the water-splitting system of Photosystem II Biochim Biophys Acta 1144 204-212 587
Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
Eur J Biochem 260 833-843 593
Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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33
Ciornii D Riedel M Stieger KR Feifel SC Hejazi M Lokstein H Zouni A Lisdat F 598
(2017) Bioelectronic Circuit on a 3D Electrode Architecture Enzymatic Catalysis 599
Interconnected with Photosystem I J Am Chem Soc 139 16478-16481 600
Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel 601
genetic diversity Philos Trans R Soc Lond B Biol Sci 372 602
Das R Kiley PJ Segal M Norville J Yu AA Wang L Trammell SA Reddick LE 603
Kumar R Stellacci F Lebedev N Schnur J Bruce BD Zhang S Baldo M (2004) 604
Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
by thermal dissipation of excess energy Biochem Soc Trans 38 651-660 608
Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
device by direct chemical binding of the photosynthetic reaction center protein to 610
metal surfaces Advanced Materials 17 2434-2437 611
Frolov L Rosenwaks Y Richter S Carmeli C Carmeli I (2008) Photoelectric junctions 612
between GaAs and photosynthetic reaction center protein J Phys Chem C 112 613
13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I 617
Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
reinhardtii ACS Synth Biol 5 589-596 624
Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
state biophotovoltaic cells containing photosystem I Adv Mater 26 4863-4869 630
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Glowacka K Kromdijk J Kucera K Xie J Cavanagh AP Leonelli L Leakey ADB Ort 631
DR Niyogi KK Long SP (2018) Photosystem II subunit S overexpression increases 632
the efficiency of water use in a field-grown crop Nat Commun 9 868 633
Gnanasekaran T Karcher D Nielsen AZ Martens HJ Ruf S Kroop X Olsen CE 634
Motawie MS Pribil M Moller BL Bock R Jensen PE (2016) Transfer of the 635
cytochrome P450-dependent dhurrin pathway from Sorghum bicolor into Nicotiana 636
tabacum chloroplasts for light-driven synthesis J Exp Bot 67 2495-2506 637
Haniewicz P Abram M Nosek L Kirkpatrick J El-Mohsnawy E Olmos JDJ Kouřil 638
R Kargul JM (2018) Molecular mechanisms of photoadaptation of photosystem I 639
supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
harvesting chlorophyll ab-binding protein in Synechocystis sp PCC 6803 Eur J 643
Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
synthase is a highly divergent paralog of PsbA of photosystem II Science 353 646
Holt NE Fleming GR Niyogi KK (2004) Toward an understanding of the mechanism of 647
nonphotochemical quenching in green plants Biochemistry 43 8281-8289 648
Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
D Kamachi T Okura I (2006a) Light-driven hydrogen production by a hybrid 650
complex of a [NiFe]-hydrogenase and the cyanobacterial photosystem I Photochem 651
Photobiol 82 676-682 652
Ihara M Nakamoto H Kamachi T Okura I Maeda M (2006b) Photoinduced hydrogen 653
production by direct electron transfer from photosystem I cross-linked with 654
cytochrome c3 to [NiFe]-hydrogenase Photochem Photobiol 82 1677-1685Janna 655
Olmos JD Kargul J (2015) A quest for the artificial leaf Int J Biochem Cell Biol 656
66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
Pawlak D Kargul J (2017) Biofunctionalisation of p-doped silicon with cytochrome 659
c553 minimises charge recombination and enhances photovoltaic performance of the 660
all-solid-state photosystem I-based biophotoelectrode RSC Adv 7 47854-47866 661
Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations 662
ACS Chem Biol 6 533-539 663
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35
Jensen PE Leister D (2014) Chloroplast evolution structure and functions F1000Prime 664
Rep 6 40 665
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip 666
functionalization of carbon nanotubes with photosystem I J Am Chem Soc 132 667
2872-2873 668
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and 669
its application in biomimetic solar-to-fuel systems J Plant Physiol 169 1639-1653 670
Kargul J Bubak G Andryianau G (2018) Biophotovoltaic systems based on 671
photosynthetic complexes In Wandelt K (Ed) Encyclopedia of Interfacial 672
Chemistry Surface Science and Electrochemistry vol 7 pp 43-63 673
Kim YS Hara M Ikebukuro K Miyake J Ohkawa H Karube I (1996) Photo-induced 674
activation of cytochrome P450reductase fusion enzyme coupled with spinach 675
chloroplasts Biotechnol Tech 10 717minus720 676
Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic 677
hydrogen production by a hybrid complex of photosystem I and [NiFe]-hydrogenase 678
ACS Nano 3 4055-4061 679
Kromdijk J Glowacka K Leonelli L Gabilly ST Iwai M Niyogi KK Long SP (2016) 680
Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
Kubota H Sakurai I Katayama K Mizusawa N Ohashi S Kobayashi M Zhang P Aro 683
EM Wada H (2010) Purification and characterization of photosystem I complex 684
from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim 685
Biophys Acta 1797 98-105 686
Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future 702
by engineering crop photosynthesis and yield potential Cell 161 56-66 703
Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
(2011) Solar hydrogen-producing bionanodevice outperforms natural photosynthesis 709
Proc Natl Acad Sci U S A 108 20988-20991 710
Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
production Biochemistry 49 10264-10266 713
Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
organisms using whole-cell and cell-free systems Appl Biochem Biotechnol 183 715
503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
hydrogenases J Biochem 123 644-649 718
Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
(2016) Fusion of ferredoxin and cytochrome P450 enables direct light-driven 720
biosynthesis ACS Chem Biol 11 1862-1869 721
Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous 722
enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
Y Nishihara H (2010) A photosensing system composed of photosystem I 725
molecular wire gold nanoparticle and double surfactants in water Chem Commun 726
(Camb) 46 2557-2559 727
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
(2009) Surface immobilization of PSI using vitamin K1-like molecular wires for 729
fabrication of a bio-photoelectrode J Nanosci Nanotechnol 9 1722-1726 730
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37
Molina-Heredia FP Wastl J Navarro JA Bendall DS Hervas M Howe CJ De La Rosa 731
MA (2003) Photosynthesis a new function for an old cytochrome Nature 424 33-34 732
Mullineaux CW Emlyn-Jones D (2005) State transitions an example of acclimation to 733
low-light stress J Exp Bot 56 389-393 734
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J 735
Nanosci Nanotechnol 9 1709-1713 736
Nguyen K Bruce BD (2014) Growing green electricity progress and strategies for use of 737
photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello 742
Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in 748
understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in 750
Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
complex Plant Cell 3 383-395 752
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
S Cazzaniga S Bassi R (2015) Heterologous expression of moss light-harvesting 764
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38
complex stress-related 1 (LHCSR1) the chlorophyll a-xanthophyll pigment-protein 765
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24340-24354 767
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Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
phosphatase TAP38 in LHCII dephosphorylation and thylakoid electron flow PLoS 771
Biol 8 e1000288 772
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
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Lett 581 2768-2775 776
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3619-3639 782
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2189 785
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134-145 788
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(2017) Plasmon-induced absorption of blind chlorophylls in photosynthetic proteins 790
assembled on silver nanowires Nanoscale 9 10475-10486 791
792
Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
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1585-1587 797
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39
Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M 798
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Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M 800
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molecular wire Biochim Biophys Acta 1767 653-659 802
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N 803
(2006) Functional replacement of ferredoxin by a cyanobacterial flavodoxin in 804
tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050 805
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
U S A 104 11495-11500 809
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Norici A Shotland Y Ohad I Kaplan A (2016) The mechanisms whereby the 811
green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled 812
photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
Photosystem I-catalyst hybrids Curr Opin Chem Biol 25 1-8 815
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium 816
Synechocystis sp PCC 6803 carrying spinach sequences Construction and function 817
Photosynth Res 48 147-162 818
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene 819
replacement in Synechocystis sp PCC 6803 Microb Cell Fact 13 4 820
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
thaliana J Biol Chem 278 31286-31289 826
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M 827
Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
dependent pathways into Synechocystis sp PCC 6803 Metab Eng 33 1-11 830
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40
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in 831
functional photosystem II complexes of cyanobacteria Proc Natl Acad Sci U S A 98 832
14168-14173 833
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) 834
Photosynthetic electron partitioning between [FeFe]-hydrogenase and 835
ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S 836
A 108 9396-9401 837
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of 838
alternative electron flow by flavodiiron proteins in Arabidopsis Nat Plants 2 16012 839
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ 840
(2018) Ectopic expression of SsPETE2 a plastocyanin from Suaeda salsa improves 841
plant tolerance to oxidative stress Plant Sci 268 1-10 842
843
844
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wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
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5
photosystems and antenna complexes (phycobiliosomes and light-harvesting complexes 100
(LHCs)) In principle the building blocks should be interchangeable between cyanobacteria 101
algae and plants Instances of the swapping of homologous photosynthetic proteins between 102
species by means of genetic engineering are discussed in the next section to highlight the 103
complications associated with apparently straightforward approaches The focus then shifts to 104
genuinely synthetic approaches in which specific photosynthetic building blocks have been 105
introduced into photosynthetic species that lack them In the subsequent two sections the 106
combination of non-photosynthetic (Bio-bio hybrids using photosynthesis as an electron 107
source for unrelated biological processes) and non-biological building blocks (Bio-nano 108
hybrids using photosynthesis as an electron source for non-biological processes) with 109
components of the photosynthetic machinery are described An overview of these approaches 110
is provided in Figure 2 111
112
Exchange of conserved photosynthetic modules 113
Theoretically it should be relatively easy to exchange individual conserved photosynthetic 114
proteins between different species even in such distantly related organisms as cyanobacteria 115
and plants However in practice these simple genetic engineering exercises can be 116
problematic (Table 1) Several individual proteins from cyanobacterial PSII (D1 CP43 and 117
PsbH) and PSI (PsaA) have indeed been genetically replaced by their plant counterparts with 118
varying success Synechocystis strains expressing the D1 protein from Poa annua or PsbH 119
from maize (Zea mays) could still perform photosynthesis ndash albeit with less efficiency than 120
the WT strain (Nixon et al 1991 Chiaramonte et al 1999) ndash but replacement of 121
Synechocystis CP43 or CP47 by their homologs from spinach (Spinacia oleracea) was 122
incompatible with photoautotrophy (Carpenter et al 1993 Vermaas et al 1996) Similarly 123
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6
in Synechocystis strains equipped with Arabidopsis thaliana PsaA PSI function was severely 124
disrupted (Viola et al 2014) 125
Such complications resulting from the replacement of core subunits of photosystems 126
despite their high similarity (78ndash86 identity between the cyanobacterial and plant proteins 127
Table 1) reflect the so-called ldquofrozen metabolic staterdquo of the photosynthetic multiprotein 128
complexes This term was coined by Gimpel et al (2016) but was originally introduced as 129
ldquofrozen metabolic accidentrdquo by Shi et al (2005) The ldquofrozen metabolic accidentrdquo concept 130
refers to the observation that selection has not significantly altered biophysically and 131
physiologically inefficient photosynthetic proteins (including the D1 protein of PSII or 132
RuBisCO of the Calvin-Benson cycle) over billions of years of evolution In fact 133
bioinformatic analysis of photosynthetic cyanobacterial genes suggests that the evolution rate 134
of proteins at the core of the photosynthetic apparatus is highly constrained by protein-135
protein protein-lipid and protein-cofactor interactions (Shi et al 2005) This provides an 136
internal selection pressure conserving the sequence of proteins in photosynthetic 137
multiprotein complexes and ndash in case of prokaryotes ndash also the genomic organization of their 138
genes (Shi et al 2005) The term ldquofrozen metabolic accidentrdquo was generalized to ldquofrozen 139
metabolic staterdquo by Gimpel et al (2016) and implies that in each photosynthetic species 140
slightly distinct modules of the cores of photosynthetic multiprotein complexes have evolved 141
that are optimized with respect to their intrinsic interactions and that rarely tolerate the 142
alteration of single proteins by exchange or mutation In consequence the simultaneous 143
exchange of entire sets of core proteins (or ldquomodulesrdquo) with all their intrinsic interactions 144
should be more feasible than substituting individual proteins that may disrupt the ldquofrozen 145
metabolic staterdquo Such an experiment has been performed in the green alga Chlamydomonas 146
reinhardtii where the six PSII core proteins D1 CP47 CP43 D2 Cyt b559- and were 147
swapped for their homologs from two other green algal species (Gimpel et al 2016) 148
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7
Photoautotrophy was not affected by the exchange of this synthetic biology module although 149
the fully altered strains performed suboptimally compared to strains in which only 1ndash5 genes 150
were exchanged However in control experiments where the synthetic C reinhardtii six-gene 151
module was re-introduced to the C reinhardtii deletion strain that lacked all six genes only 152
about 86 of wild-type PSII functionality was rescued Tentative explanations for this 153
decreased efficiency include (i) off-target effects of the PSII gene deletions on the operon 154
components and tRNA genes associated with these PSII loci (ii) misregulation of the 155
transferred PSII genes because their expression cassettes lacked unidentified cis-acting DNA 156
elements and (iii) perturbation of polycistron-dependent post-transcriptional regulation of the 157
transformed genes since they were no longer part of an operon (Gimpel et al 2016) 158
Taken together the outcomes of these replacement experiments indicate that 159
exchanging conserved photosynthetic proteins from multiprotein complexes can be 160
problematic given the highly integrated nature of the photosynthetic machinery Therefore 161
approaches designed to enhance photosynthesis such as introducing the high-light-resistant 162
D1 protein from a green alga that lives under extreme conditions (Treves et al 2016) into 163
crop plants do not appear promising Instead entire (sub)complexes with their internal 164
network of evolutionarily optimized interactions should be transferable between species 165
166
Exchange of non-conserved photosynthetic modules 167
Inspection of the repertoire of subunits of the photosynthetic machinery in the three model 168
species Synechocystis PCC6803 C reinhardtii and A thaliana which represent different 169
stages in the evolution of oxygen-generating photosynthesis shows that the most dramatic 170
changes in the photosynthetic proteome occurred during the transition from the 171
cyanobacterial endosymbiont (for which Synechocystis serves as a proxy) to the chloroplast 172
of unicellular algae (with C reinhardtii as proxy) (Fig 3 Supplemental Table 1) In 173
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8
particular phycobilisomes flavodoxin and several photosystem subunits were lost while 174
LHCs some novel photosystem subunits and several proteins involved in alternative electron 175
pathways or photoprotection evolved During the transition from algal chloroplasts to those 176
of flowering plants relatively few proteins were lost (eg flavodiiron proteins and the 177
canonical cytochrome c6) or acquired (Lhcb6CP24) (Fig 3 Supplemental Table 1) The 178
NAD(P)H dehydrogenase (NDH) complex involved in antimycin A-insensitive cyclic 179
electron flow (see Box 1) is a special case since the chloroplast NDH from flowering plants 180
traces back to the cyanobacterial complex but the complex was lost during evolution in C 181
reinhardtii (Fig 3 Supplemental Table 1) 182
Several attempts have been made to introduce photosynthetic proteins into species 183
that lack the corresponding homolog (Table 2) These heterologous expression approaches 184
have been successful for the soluble electron transporters flavodoxin cytochrome c6 and 185
flavodiiron proteins Indeed cyanobacterial flavodoxin can at least partially replace plant 186
ferredoxin and confer enhanced stress tolerance when expressed in addition to ferredoxin 187
(Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011) Similarly red algal 188
cytochrome c6 enhances growth and photosynthesis of A thaliana plants (Chida et al 2007) 189
Since A thaliana lacks a functional cytochrome c6 that can transfer electrons from the Cyt b6f 190
complex to PSI (Molina-Heredia et al 2003 Weigel et al 2003) it is plausible that the 191
more oxidized plastoquinone pool in the transgenic plants is a direct consequence of 192
additional PSI reduction mediated by the algal protein (Chida et al 2007) Interestingly it 193
seems to make no difference if an endogenous soluble electron transport protein (see Box 3) 194
or its heterologous equivalent from a distant species is overexpressed For instance 195
overexpression of the endogenous soluble proteins plastocyanin and ferredoxin can also 196
enhance growth in plants (Pesaresi et al 2009 Lin et al 2013 Chang et al 2017 Zhou et 197
al 2018) Interestingly and rather unexpectedly this concept can also work for certain 198
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9
proteins that are part of multiprotein complexes (Simkin et al 2017 see Box 3) This 199
indicates that the quantity of such proteins is relevant for growth enhancement and not its 200
evolutionary origin 201
More recently the two Physcomitrella patens flavodiiron protein (FLV) genes FlvA 202
and FlvB were introduced into A thaliana which like other angiosperms has lost FLVs 203
during evolution (Yamamoto et al 2016) FLVs are the main mediators of pseudo-cyclic 204
electron flow in photosynthetic organisms but heterologous expression of FLVs in A 205
thaliana had no effect on steady-state photosynthesis and growth of the transgenic plants 206
(Yamamoto et al 2016) However the Arabidopsis FLV lines displayed higher 207
photosynthetic yields just after the onset of actinic light following a long dark adaptation 208
suggesting that the FLVs mediated a large electron sink during the induction of 209
photosynthesis In fluctuating light experiments the Arabidopsis FLV lines had much less 210
PSI acceptor side limitation implying that the large FLV-mediated electron sink makes 211
photosynthesis more resistant to the fluctuating light Consequently this protective effect of 212
FLVs is more pronounced in Arabidopsis lines that are more sensitive to fluctuating light like 213
the pgr5 mutant defective in antimycin A-sensitive cyclic electron flow (see Box 1 Leister 214
and Shikanai 2013 Yamamoto et al 2016) Similarly expression of FLVs in a rice (Oryza 215
sativa) line with markedly reduced cyclic electron flow restored CO2 assimilation and growth 216
rate to wild-type levels (Wada et al 2018) Like FLVs LHcxLHCSR proteins play a role in 217
photoprotection in green algae and mosses but have been lost in angiosperms during 218
evolution Heterologous expression of P patens LHCSR1 in Nicotiana benthamiana and 219
Nicotiana tabacum yielded an active protein that has properties similar if not identical to 220
those of moss LHCSR1 (Pinnola et al 2015) 221
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10
Efforts to create LHCII complexes like those in plants by heterologously expressing 222
the membrane-spanning light-harvesting chlorophyll ab-binding protein Lhcb from Pisum 223
sp (pea) in Synechocystis were unsuccessful 224
Although the pea Lhcb protein was synthesized in Synechocystis and integrated into 225
the membrane it did not accumulate to steady-state levels detectable by immunoblot analysis 226
(He et al 1999) Possible explanations are that Lhcb is rapidly degraded either because its 227
ldquounfamiliarrdquo structure makes it a good substrate for the cyanobacterial proteolytic system or 228
it cannot foldassemble properly due to the lack of plant-specific pigments or assembly 229
factors Interestingly chlorophyll b production (see Box 2) after introduction of plant 230
chlorophyll a oxygenase (CAO) is boosted when Lhcb is expressed even though LHCII does 231
not accumulate in detectable amounts (Xu et al 2001) 232
Even soluble multiprotein complexes can be heterologously expressed as has been 233
impressively demonstrated from the carbon-fixation end of photosynthesis For example by 234
coexpression of five auxiliary factors a functional plant RuBisCo complex was successfully 235
assembled in Escherichia coli (Aigner et al 2017) This result is in line with the ldquofrozen 236
metabolic staterdquo concept showing that photosynthetic proteins embedded in a network of 237
interactions with other proteins and auxiliary factors can be introduced into distantly related 238
species but only with their own interaction networks While Gimpel et al (2016) showed that 239
efficient gene expression needs to be accounted for when designing synthetic modules for the 240
transfer of photosystem subunits from one species to another Aigner et al (2017) 241
demonstrated that auxiliary factors required for the biogenesis of photosynthetic 242
(sub)complexes need to be considered in such experiments adding additional facets to the 243
ldquofrozen metabolic staterdquo concept 244
Auxiliary factors required for the accumulation of photosynthetic multiprotein 245
complexes include (i) cofactors like iron-sulfur clusters and pigments (see Box 2) (ii) 246
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11
chaperones that are required for the insertion of co-factors (eg pigments into LHCs Schmid 247
2008) and (iii) assembly factors Assembly factors are required to support the stepwise 248
assembly and functionality of the multiproteinpigment complexes and many of these are 249
conserved between photosynthetic species (Nixon et al 2010 Nickelsen and Rengstl 2013 250
Jensen and Leister 2014) Therefore the exchange of entire multiprotein complexes between 251
distantly related species will not be simple due to the repertoire of auxiliary factors that has 252
markedly changed during evolution Since the species that Gimpel et al (2016) studied were 253
closely related this aspect could be neglected In consequence the impact of these auxiliary 254
factors on the formation of multiproteinpigment complexes will have to be fully elucidated 255
to understand which factors are sufficient to assemble a photosynthetic multiprotein complex 256
previous (genetic) approaches only identified factors required for this process Hence the 257
transfer of entire photosynthetic (sub)complexes between distantly related species by a 258
ldquosynthetic photosynthetic modulerdquo must include entire sets of strongly interacting proteins (to 259
address the ldquofrozen metabolic staterdquo) as well as all genetic elements and auxiliary factors 260
sufficient for efficient expression biogenesis and function of the proteins in the module 261
262
Bio-bio hybrids using photosynthesis as an electron source for unrelated biological 263
processes 264
The idea of using the reducing power of photosynthesis to drive unrelated metabolic reactions 265
has inspired several biotechnological concepts The photosynthesis-driven formation of 266
secondary metabolites has been demonstrated in vivo whereas light-driven generation of H2 267
by bio-bio hybrids so far works only in vitro and is closely related to bio-nano approaches 268
Therefore coupling of photosynthesis to previously unrelated pathways is discussed here 269
first followed by bio-bio systems for H2 generation 270
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12
Redirection of PSI reducing equivalents to drive reactions catalyzed by cytochrome 271
P450 enzymes has been achieved in vivo by genetic modifications of plants and 272
cyanobacteria (Lassen et al 2014a Nielsen et al 2016 Mellor et al 2017) Cytochrome 273
P450s constitute the largest family of plant enzymes that acts on various endogenous and 274
xenobiotic molecules (Rasool and Mohamed 2016) Their extreme versatility and 275
irreversibility of catalyzed reactions make these enzymes very attractive for use in 276
biotechnology medicine and phytoremediation P450s are monooxygenases that insert an 277
oxygen atom into hydrophobic molecules which enhances their reactivity and hydrophilicity 278
Most eukaryotic P450s require NADPHcytochrome P450 reductase as the electron donor 279
The ER membrane is generally accepted to be the primary subcellular repository of 280
eukaryotic P450s and their NADPHcytochrome P450 reductase By relocating cytochrome 281
P450s to the chloroplasts the reducing power of photosynthesis can be directly targeted to 282
the reactions catalyzed by these enzymes thus providing the basis for the large-scale 283
production of valuable products Initial attempts to couple P450s with photosynthesis were 284
conducted in vitro (Table 3 Fig 4A) Spinach chloroplasts were combined with microsomes 285
from yeast cells that had been stably transformed with a fusion gene expressing the rat 286
CYP1A1-NADPHcytochrome P450 reductase fusion enzyme (Kim et al 1996) These 287
experiments confirmed that it is feasible to drive P450-mediated reactions using electrons 288
derived from photosynthetically generated NADPH Intriguingly the NADPHcytochrome 289
P450 reductase is not always essential as demonstrated by co-incubating CYP79A1 from 290
sorghum (Sorghum bicolor) with barley (Hordeum vulgare) PSI and employing ferredoxin to 291
directly deliver electrons from PSI to the P450 (Jensen et al 2011) This approach was also 292
shown to be practicable in vivo CYP79A1 either alone or in combination with CYP71E1 293
and the UDP-glucosyltransferase UGT85B1 was first targeted in vivo to cyanobacterial or 294
plant thylakoid membranes where they catalyzed the same reactions as in their original 295
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13
cellular compartment (the ER) utilizing photosynthetically reduced ferredoxin as the electron 296
donor (Nielsen et al 2013 Lassen et al 2014b Gnanasekaran et al 2016 Wlodarczyk et 297
al 2016) Genetic fusions have also been employed for the coupling of P450s to PSI 298
CYP79A1 has been fused to either cyanobacterial PsaM or Arabidopsis ferredoxin and the 299
engineered enzyme showed light-driven activity both in vivo and in vitro (Lassen et al 300
2014b Mellor et al 2016) In the latter case the efficiency of the system was enhanced 301
because the fusion could compete better with endogenous electron sinks coupled to metabolic 302
pathways (Mellor et al 2016) 303
In contrast to PSI-P450 hybrids PSI-hydrogenase hybrids currently function only in 304
vitro Unlike fossil fuels H2 is environmentally benign as it produces only water when 305
combusted Therefore in principle harnessing of the reducing power of photosynthesis for 306
the direct production of H2 (ie ultimately using sunlight and water) would yield a fully 307
sustainable system of energy generation PSI but not PSII provides a standard midpoint 308
potential that is sufficiently negative to power the reduction of protons to H2 (Utschig et al 309
2015) Hence approaches have been developed to engineer PSI to produce H2 either as 310
replacement or in addition to its natural product NADPH (see Figure 1 in Box 1) by 311
redirecting PSI electrons to a catalytic component This catalytic component can be abiotic or 312
biotic (hydrogenases) The feasibility of coupling H2 generation to photosynthesis was 313
demonstrated 45 years ago by mixing chloroplast preparations with ferredoxin and 314
hydrogenase (Benemann et al 1973) Twenty-five years later hydrogen evolution by direct 315
electron transfer (without ferredoxin) from PSI to hydrogenases was accomplished for the 316
first time (McTavish 1998) 317
Hydrogenases catalyze the reversible interconversion of H2 into protons and electrons 318
and are widespread in nature they occur in bacteria and archaea but also in some eukarya In 319
vivo hydrogenases can mediate photosynthetic H2 production albeit mostly indirectly or 320
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14
under anaerobic conditions due to their oxygen sensitivity (Ghirardi 2015 Oey et al 2016) 321
Hydrogenases can be classified according to their metal-ion composition eg [NiFe] and 322
[FeFe] hydrogenases (Lubitz et al 2014 Martin and Frymier 2017) [FeFe] hydrogenases 323
preferentially catalyze proton reduction and can evolve H2 at high rates but are extremely 324
sensitive to O2 and are the only type of hydrogenases found in eukaryotic microorganisms 325
[NiFe] hydrogenases are less sensitive to O2 but preferentially oxidize H2 under 326
physiological conditions (Lubitz et al 2014) In vitro both types of hydrogenases have been 327
directly linked to PSI (Table 3 Fig 4B) PSI-[NiFe] hydrogenase complexes have been 328
generated by fusing the hydrogenase genetically to the PsaE protein (Ihara et al 2006a) PSI-329
[FeFe] hydrogenase complexes were obtained by genetically fusing the hydrogenase to 330
ferredoxin (Yacoby et al 2011) or covalently linking the FeS clusters present in the 331
hydrogenase to PSI via a molecular wire (Lubner et al 2010 Lubner et al 2011) 332
Two parameters characterize the efficiency of these in-vitro systems their H2 333
production rate and longevity While low rates of H2 production (in the range from 01 to 10 334
μmol H2mg chlorophyllh) were described for the early chloroplast extract experiments and 335
genetic fusions of PSI to [NiFe] or [FeFe] hydrogenases (McTavish 1998 Ihara et al 2006a 336
Yacoby et al 2011) higher rates of between 2000 and 3000 μmol H2mg chlorophyllh have 337
been achieved with wired PSI-[FeFe] hydrogenase complexes and genetically fused PSI-338
[NiFe] hydrogenase complexes assembled on a gold electrode (Krassen et al 2009 Lubner 339
et al 2011) Few data are available with respect to the longevity of the PSI-hydrogenase 340
systems however a minimum lifetime of 64 days was reported for a wired [FeFe] 341
hydrogenase-PSI complex at room temperature and under ambient illumination (Lubner et 342
al 2010) 343
The future use of hydrogenases in photosynthesis-driven H2 production will strongly 344
depend on whether or not it is possible to overcome the O2 sensitivity of many hydrogenases 345
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15
by for instance employing oxygen-tolerant [NiFe] hydrogenases (Burgdorf et al 2005 346
Schiffels et al 2013) If this is not possible their efficient use in vivo in thylakoids which 347
inevitably generate O2 during linear electron flow will be impossible However as 348
demonstrated with the gold surface system (Krassen et al 2009) the design of novel 349
matrices into which the hybrid system can be incorporated may markedly enhance the 350
efficiency 351
352
Bio-nano hybrids Use of photosynthesis as a source of electrons for non-biological 353
processes 354
From bio-bio hybrids it is only a small step to developing bio-nano hybrids as demonstrated 355
by PSI hybrids that employ abiotic catalysts for photosynthetic hydrogen production instead 356
of hydrogenase In fact abiotic catalysts have the advantage of bypassing the lability of 357
hydrogenases in the presence of oxygen PSI-platinum hybrids have been produced by 358
combining PSI with platinum nanoparticles (either directly or via tethering by nanowires) or 359
platinum nanoclusters (Kargul et al 2012 Fukuzumi 2015 Utschig et al 2015) (Fig 5A 360
Table 4) Current PSI-platinum hybrids are less efficient than the most advanced PSI-361
hydrogenase systems but are extremely robust (Utschig et al 2015) However future 362
widespread usage of the PSI-platinum system will be limited by the high cost of platinum A 363
more economical alternative to precious metals are earth-abundant molecular catalysts 364
However hybrids consisting of PSI and earth-abundant molecular catalysts have a much 365
shorter working life than platinum-based configurations (Utschig et al 2015) likely due to 366
instability of the molecular catalyst 367
PSI-based photocurrent-producing devices constitute another class of photosynthesis-368
derived nano-bio systems (Table 4 Fig 5) In such devices PSI is immobilized onto 369
electrodes Many variants of this concept have been tested such as varying the electrode 370
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16
materials immobilizationorientation strategies andor artificial redox mediators (Nguyen and 371
Bruce 2014 Janna Olmos and Kargul 2015 Plumereacute and Nowaczyk 2017 Kargul et al 372
2018) PSI must be immobilized on the electrode surface in such a way that electron transfers 373
between the electrodes and the oxidizing (P700) and reducing (FB - the terminal [4Fe-4S] 374
cluster or an intermediate electron transporter) sites of PSI can proceed with the required 375
efficiency Electrons are transferred between the electrodes and the oxidizing or reducing 376
sides of PSI either by a diffusible redox mediator or molecular wires Examples of electrode 377
materials and redox mediators are provided in Table 4 After P700 photo-excitation electrons 378
are transferred from P700 via several factors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB) to the 379
iron-sulfur cluster FB (see legend of Box 1) As in the case of PSI-hydrogenase and PSI-380
platinum nanoparticles PSI can be wired to its electrodes This has been achieved by wiring 381
the A1 cofactor (phylloquinone) to the substrate surface such that electrons are directly 382
transferred from A1 to the electrode thus bypassing the downstream FeS clusters (FX FA FB) 383
in the stromal domain of PSI (Terasaki et al 2007 Miyachi et al 2009 Terasaki et al 384
2009 Miyachi et al 2010) 385
Modifications of PSI have been utilized to enhance the efficiency of the photocurrent-386
generating system (Das et al 2004 Frolov et al 2005 Carmeli et al 2010) As mentioned 387
previously fusions to the stroma-faced PSI subunit PsaE can be used to link new components 388
to PSI however in this case PsaD fusions were used To this end recombinant His-tagged 389
PsaD was immobilized on the functionalized electrode surface which was then exposed to 390
native PSI complexes resulting in immobilized PSI with P700 facing away from the 391
electrode (Das et al 2004) Another way to control the orientation of PSI during 392
immobilization involves introducing cysteine mutations To allow for direct thiol coupling to 393
an Au surface various residues on the lumen-exposed face of PSI were replaced by cysteine 394
and tested (Frolov et al 2005) PSI attachment was achieved with all single mutants even 395
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17
those placed further from the P700 site suggesting that a specific location is not required as 396
long as the cysteine is exposed at the luminal surface of PSI The concept of targeted 397
attachment via introduced cysteine residues was exploited in subsequent studies to link PSI to 398
maleimide-functionalized gallium arsenide (Frolov et al 2008) to immobilize PSI between 399
the substrate and a metallized scanning near-field optical microscopy tip (Gerster et al 400
2012) and to bind PSI to carbon nanotubes (Kaniber et al 2010) Another modification of 401
PSI is represented by the attachment of plasmonic metal nanoparticles which resulted in 402
enhanced light absorption (Carmeli et al 2010) even in the green part of the solar spectrum 403
that is not normally absorbed (Szalkowski et al 2017) This suggests that it is possible to 404
enhance light absorption by PSI in vitro through the attachment of abiotic components that 405
act as optical antennae to extend the spectrum of photons available for P700 activation 406
Taken together these efforts demonstrate that PSI-based photocurrent-generating 407
systems are still in an exploratory phase with many variants under development In the next 408
phase viable building blocks and reference systems should be established that can serve as 409
starting points for the systematic engineering of superior systems This will require the 410
modification of PSI for optimal effect in artificial systems and will undoubtedly differ 411
substantially from the original environment in which PSI was molded by biological 412
evolution 413
414
Concluding remarks and outlook 415
Enhancing photosynthesis and growth can be achieved by a simple overexpression of certain 416
photosynthetic proteins and PSI can be coupled to previously unconnected biotic or abiotic 417
components to generate valuable compounds hydrogen or electricity Moreover entire 418
photosynthetic complexes can be functionally expressed in distantly related species (as 419
demonstrated for RuBisCO Aigner et al 2017) Thus what are the next goals and which 420
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18
challenges need to be overcome Two challenges for the in vivo systems are obvious (i) 421
enhancing the efficiency of in-vivo bio-bio hybrids and (ii) upscaling the size of ldquosynthetic 422
photosynthetic modulesrdquo to cover entire photosystems or complex antenna systems 423
With respect to the enhancement of in vivo cyanobacterial and algal systems 424
harboring hybrid configurations in which photosynthesis directly drives previously 425
unconnected pathways the use of laboratory evolution offers a unique opportunity to tailor 426
these systems for their intended purpose Laboratory evolution utilizes the high rate of 427
evolution typical in microbial systems (in particular if suitable selection conditions can be 428
designed) to fine tune and optimize processes through selection of advantageous genetic 429
variation While this strategy has been employed in E coli and yeast with impressive success 430
now photosynthetic microbial systems are emerging as attractive targets for this approach 431
(Leister 2017) 432
The exchange of entire multiprotein complexes between distantly related species will 433
not be a simple exercise because the ldquofrozen metabolic staterdquo of the core photosynthetic 434
complexes will necessitate the exchange of major parts of photosystems rather than 435
individual subunits The RuBisCO case study by Aigner et al (2017) represents of promising 436
proof of principle but one needs to consider that the synthetic RuBisCO module comprised 437
only the two different subunits present in the mature complex and five auxiliary factors for its 438
assembly Entire photosystems will require much larger ldquosynthetic photosynthetic modulesrdquo 439
and many of the auxiliary factors have not been identified yet Therefore when designing 440
these complex ldquosynthetic photosynthetic modulesrdquo we will identify the set of components 441
that are sufficient (and not only necessary) to drive photosynthesis providing an 442
unprecedentedly deep understanding of this fundamental and complex process 443
Given that the problems described above can be solved what will be the next steps in 444
the synthetic biology of the light reactions of photosynthesis The combination of ldquosynthetic 445
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19
photosynthetic modulesrdquo from diverse species could allow the design of novel variants of 446
photosynthesis Numerous instances of such ldquorecombined photosynthetic variantsrdquo can be 447
imagined including plants that employ cyanobacteria-derived phycobilisomes for highly 448
sufficient photosynthesis under low light conditions cyanobacteria that employ plant-derived 449
LHCs as antenna to shift light saturation of photosynthesis to higher intensities or the 450
integration of cyanobacterial Chl d and Chl f (which can absorb far-red and near infra-red 451
light) into algal or plant photosynthesis to expand the spectral region available to drive 452
photosynthesis (Loughlin et al 2013 Ho et al 2016) Moreover such variants of 453
recombined photosynthesis could be further optimized by laboratory evolution within a 454
suitable microbial chassis However such recombined photosynthetic variants cannot be 455
considered a truly novel type of photosynthesis because they would only bring preexisting 456
pieces together that evolution has separated Nevertheless they could be an important step 457
towards the ambitious goal to design truly novel ldquosynthetic photosynthetic modulesrdquo that 458
contain more efficient substitutes of the ldquofrozen metabolic accidentsrdquo discussed above 459
Ample proof of functionality for in-vivo hybrids (between photosynthesis and 460
previously unconnected metabolic pathways) and in-vitro hybrids (between PSI and biotic or 461
abiotic catalysts) has been obtained but such systems will only be commercially successful if 462
they can compete with established non-biological systems Tailoring of PSI in cyanobacteria 463
where techniques like gene replacement and gene modification are routine may contribute to 464
further improving the efficiency and robustness of in vitro and in vivo hybrids One 465
promising route could be to identify those parts of the original PSI (which evolved under 466
constraints imposed by the cyanobacterial cell) that are necessary for hybrid devices (a 467
ldquominimalrdquo PSI) Such bio-nano systems can be optimized to include novel non-biological 468
components that replace or complement natural pigments andor the protein-based backbone 469
of photosystems going far beyond the limited toolbox of Naturersquos chemistry Such novel 470
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20
systems inspired by natural photosynthesis could be used to engage biologists in the design 471
of fundamentally different types of photosynthesis in living organisms 472
473
SUPPLEMENTAL DATA 474
Supplemental Table 1 Absencepresence of photosynthetic proteins in the three model 475
species Synechocystis PCC6803 (Syn) Chlamydomonas reinhardtii (Cr) and Arabidopsis 476
thaliana (At) 477
478
ACKNOWLEDGMENTS 479
The authors thank Paul Hardy for critical reading of the manuscript 480
481
482
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21
Table 1 Replacement of conserved individual or multiple photosynthetic proteins 483
GeneProtein Description Protein
identity
Reference
psbAD1 Synechocystis D1 was replaced by its homolog from
Poa annua which resulted in slower growth This is
likely to be due to increased charge recombination
between the donor and acceptor sides of the reaction
center
86 Nixon et al
1991
psbBCP47 Synechocystis CP47 was replaced by its homolog
from spinach and photoautotrophy was lost
80 Vermaas et
al 1996
psbCCP43 Synechocystis CP43 was replaced by its homolog
from spinach and photoautotrophy was lost
85 Carpenter et
al 1993
psbHPsbH Synechocystis PsbH was replaced by its counterpart
from maize The resulting strain displayed increased
light sensitivity and lower chlorophyll content
78 Chiaramonte
et al 1999
psaAPsaA Synechocystis PsaA was replaced by its equivalent
from A thaliana This resulted in reduced photo-
autotrophical growth and a drastically reduced
ChlPC ratio
80 Viola et al
2014
psbABCDEF
D1CP47CP43D2
Cyt b559-+
All six core subunits of C reinhardtii were replaced
by their counterparts from two different green algae
(V carteri and S obliquus) The resulting strains
were photoautotrophic but showed reduced
photosynthetic efficiency and the heterologous
82 -
99
Gimpel et al
2016
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22
proteins reached only between 10 and 20 of the
levels of those they replaced
484
485
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23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
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24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
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26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
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28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
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32
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566
Aigner H Wilson RH Bracher A Calisse L Bhat JY Hartl FU Hayer-Hartl M (2017) 567
Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
chloroplast-ferredoxin-hydrogenase system Proc Natl Acad Sci U S A 70 2317-2320 571
Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
complements ferredoxin deficiency in knocked-down transgenic tobacco plants Plant 574
J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
photosynthesis for energy production Curr Opin Chem Biol 17 457-461 577
Burgdorf T Lenz O Buhrke T van der Linden E Jones AK Albracht SP Friedrich B 578
(2005) [NiFe]-hydrogenases of Ralstonia eutropha H16 modular enzymes for 579
oxygen-tolerant biological hydrogen oxidation J Mol Microbiol Biotechnol 10 181-580
96 581
Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
(2010) Broad band enhancement of light absorption in photosystem I by metal 583
nanoparticle antennas Nano Lett 10 2069-2074 584
Carpenter SD Ohad I Vermaas WF (1993) Analysis of chimeric spinachcyanobacterial 585
CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
the water-splitting system of Photosystem II Biochim Biophys Acta 1144 204-212 587
Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
Eur J Biochem 260 833-843 593
Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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33
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(2017) Bioelectronic Circuit on a 3D Electrode Architecture Enzymatic Catalysis 599
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Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel 601
genetic diversity Philos Trans R Soc Lond B Biol Sci 372 602
Das R Kiley PJ Segal M Norville J Yu AA Wang L Trammell SA Reddick LE 603
Kumar R Stellacci F Lebedev N Schnur J Bruce BD Zhang S Baldo M (2004) 604
Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
by thermal dissipation of excess energy Biochem Soc Trans 38 651-660 608
Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
device by direct chemical binding of the photosynthetic reaction center protein to 610
metal surfaces Advanced Materials 17 2434-2437 611
Frolov L Rosenwaks Y Richter S Carmeli C Carmeli I (2008) Photoelectric junctions 612
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13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I 617
Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
reinhardtii ACS Synth Biol 5 589-596 624
Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
state biophotovoltaic cells containing photosystem I Adv Mater 26 4863-4869 630
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DR Niyogi KK Long SP (2018) Photosystem II subunit S overexpression increases 632
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Gnanasekaran T Karcher D Nielsen AZ Martens HJ Ruf S Kroop X Olsen CE 634
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Haniewicz P Abram M Nosek L Kirkpatrick J El-Mohsnawy E Olmos JDJ Kouřil 638
R Kargul JM (2018) Molecular mechanisms of photoadaptation of photosystem I 639
supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
harvesting chlorophyll ab-binding protein in Synechocystis sp PCC 6803 Eur J 643
Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
synthase is a highly divergent paralog of PsbA of photosystem II Science 353 646
Holt NE Fleming GR Niyogi KK (2004) Toward an understanding of the mechanism of 647
nonphotochemical quenching in green plants Biochemistry 43 8281-8289 648
Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
D Kamachi T Okura I (2006a) Light-driven hydrogen production by a hybrid 650
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Photobiol 82 676-682 652
Ihara M Nakamoto H Kamachi T Okura I Maeda M (2006b) Photoinduced hydrogen 653
production by direct electron transfer from photosystem I cross-linked with 654
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Olmos JD Kargul J (2015) A quest for the artificial leaf Int J Biochem Cell Biol 656
66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
Pawlak D Kargul J (2017) Biofunctionalisation of p-doped silicon with cytochrome 659
c553 minimises charge recombination and enhances photovoltaic performance of the 660
all-solid-state photosystem I-based biophotoelectrode RSC Adv 7 47854-47866 661
Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations 662
ACS Chem Biol 6 533-539 663
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35
Jensen PE Leister D (2014) Chloroplast evolution structure and functions F1000Prime 664
Rep 6 40 665
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip 666
functionalization of carbon nanotubes with photosystem I J Am Chem Soc 132 667
2872-2873 668
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and 669
its application in biomimetic solar-to-fuel systems J Plant Physiol 169 1639-1653 670
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Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic 677
hydrogen production by a hybrid complex of photosystem I and [NiFe]-hydrogenase 678
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Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
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from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim 685
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Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future 702
by engineering crop photosynthesis and yield potential Cell 161 56-66 703
Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
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Proc Natl Acad Sci U S A 108 20988-20991 710
Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
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production Biochemistry 49 10264-10266 713
Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
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503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
hydrogenases J Biochem 123 644-649 718
Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
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Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous 722
enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
Y Nishihara H (2010) A photosensing system composed of photosystem I 725
molecular wire gold nanoparticle and double surfactants in water Chem Commun 726
(Camb) 46 2557-2559 727
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
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fabrication of a bio-photoelectrode J Nanosci Nanotechnol 9 1722-1726 730
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Molina-Heredia FP Wastl J Navarro JA Bendall DS Hervas M Howe CJ De La Rosa 731
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low-light stress J Exp Bot 56 389-393 734
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J 735
Nanosci Nanotechnol 9 1709-1713 736
Nguyen K Bruce BD (2014) Growing green electricity progress and strategies for use of 737
photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello 742
Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
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understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in 750
Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
complex Plant Cell 3 383-395 752
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
S Cazzaniga S Bassi R (2015) Heterologous expression of moss light-harvesting 764
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38
complex stress-related 1 (LHCSR1) the chlorophyll a-xanthophyll pigment-protein 765
complex catalyzing non-photochemical quenching in Nicotiana sp J Biol Chem 290 766
24340-24354 767
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins 768
Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
phosphatase TAP38 in LHCII dephosphorylation and thylakoid electron flow PLoS 771
Biol 8 e1000288 772
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
natural product biosynthesis Protoplasma 253 1197-1209 774
Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS 775
Lett 581 2768-2775 776
Schiffels J Pinkenburg O Schelden M Aboulnaga el-HA Baumann ME Selmer T 777
(2013) An innovative cloning platform enables large-scale production and maturation 778
of an oxygen-tolerant [NiFe]-hydrogenase from Cupriavidus necator in Escherichia 779
coli PLoS One 8 e6881 780
Schmid VH (2008) Light-harvesting complexes of vascular plants Cell Mol Life Sci 65 781
3619-3639 782
Shi T Bibby TS Jiang L Irwin AJ Falkowski PG (2005) Protein interactions limit the 783
rate of evolution of photosynthetic genes in cyanobacteria Mol Biol Evol 22 2179-784
2189 785
Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS 786
Protein Increases Electron Transport Rates and Biomass Yield Plant Physiol 175 787
134-145 788
Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J 789
(2017) Plasmon-induced absorption of blind chlorophylls in photosynthetic proteins 790
assembled on silver nanowires Nanoscale 9 10475-10486 791
792
Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
Sakai M Fujii M Tohri A Iwai M Inoue Y Yoneyama S Minakata M Enami I 794
(2009) Plugging a molecular wire into photosystem I reconstitution of the 795
photoelectric conversion system on a gold electrode Angew Chem Int Ed Engl 48 796
1585-1587 797
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Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M 798
Iwai M Taguchi S Enami I Inoue Y Yamanoi Y Yonezawa T Mizuno K 799
Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M 800
(2007) Bio-photosensor Cyanobacterial photosystem I coupled with transistor via 801
molecular wire Biochim Biophys Acta 1767 653-659 802
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N 803
(2006) Functional replacement of ferredoxin by a cyanobacterial flavodoxin in 804
tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050 805
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
U S A 104 11495-11500 809
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M 810
Norici A Shotland Y Ohad I Kaplan A (2016) The mechanisms whereby the 811
green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled 812
photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
Photosystem I-catalyst hybrids Curr Opin Chem Biol 25 1-8 815
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium 816
Synechocystis sp PCC 6803 carrying spinach sequences Construction and function 817
Photosynth Res 48 147-162 818
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene 819
replacement in Synechocystis sp PCC 6803 Microb Cell Fact 13 4 820
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
thaliana J Biol Chem 278 31286-31289 826
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M 827
Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
dependent pathways into Synechocystis sp PCC 6803 Metab Eng 33 1-11 830
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40
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functional photosystem II complexes of cyanobacteria Proc Natl Acad Sci U S A 98 832
14168-14173 833
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) 834
Photosynthetic electron partitioning between [FeFe]-hydrogenase and 835
ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S 836
A 108 9396-9401 837
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of 838
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(2018) Ectopic expression of SsPETE2 a plastocyanin from Suaeda salsa improves 841
plant tolerance to oxidative stress Plant Sci 268 1-10 842
843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
6
in Synechocystis strains equipped with Arabidopsis thaliana PsaA PSI function was severely 124
disrupted (Viola et al 2014) 125
Such complications resulting from the replacement of core subunits of photosystems 126
despite their high similarity (78ndash86 identity between the cyanobacterial and plant proteins 127
Table 1) reflect the so-called ldquofrozen metabolic staterdquo of the photosynthetic multiprotein 128
complexes This term was coined by Gimpel et al (2016) but was originally introduced as 129
ldquofrozen metabolic accidentrdquo by Shi et al (2005) The ldquofrozen metabolic accidentrdquo concept 130
refers to the observation that selection has not significantly altered biophysically and 131
physiologically inefficient photosynthetic proteins (including the D1 protein of PSII or 132
RuBisCO of the Calvin-Benson cycle) over billions of years of evolution In fact 133
bioinformatic analysis of photosynthetic cyanobacterial genes suggests that the evolution rate 134
of proteins at the core of the photosynthetic apparatus is highly constrained by protein-135
protein protein-lipid and protein-cofactor interactions (Shi et al 2005) This provides an 136
internal selection pressure conserving the sequence of proteins in photosynthetic 137
multiprotein complexes and ndash in case of prokaryotes ndash also the genomic organization of their 138
genes (Shi et al 2005) The term ldquofrozen metabolic accidentrdquo was generalized to ldquofrozen 139
metabolic staterdquo by Gimpel et al (2016) and implies that in each photosynthetic species 140
slightly distinct modules of the cores of photosynthetic multiprotein complexes have evolved 141
that are optimized with respect to their intrinsic interactions and that rarely tolerate the 142
alteration of single proteins by exchange or mutation In consequence the simultaneous 143
exchange of entire sets of core proteins (or ldquomodulesrdquo) with all their intrinsic interactions 144
should be more feasible than substituting individual proteins that may disrupt the ldquofrozen 145
metabolic staterdquo Such an experiment has been performed in the green alga Chlamydomonas 146
reinhardtii where the six PSII core proteins D1 CP47 CP43 D2 Cyt b559- and were 147
swapped for their homologs from two other green algal species (Gimpel et al 2016) 148
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7
Photoautotrophy was not affected by the exchange of this synthetic biology module although 149
the fully altered strains performed suboptimally compared to strains in which only 1ndash5 genes 150
were exchanged However in control experiments where the synthetic C reinhardtii six-gene 151
module was re-introduced to the C reinhardtii deletion strain that lacked all six genes only 152
about 86 of wild-type PSII functionality was rescued Tentative explanations for this 153
decreased efficiency include (i) off-target effects of the PSII gene deletions on the operon 154
components and tRNA genes associated with these PSII loci (ii) misregulation of the 155
transferred PSII genes because their expression cassettes lacked unidentified cis-acting DNA 156
elements and (iii) perturbation of polycistron-dependent post-transcriptional regulation of the 157
transformed genes since they were no longer part of an operon (Gimpel et al 2016) 158
Taken together the outcomes of these replacement experiments indicate that 159
exchanging conserved photosynthetic proteins from multiprotein complexes can be 160
problematic given the highly integrated nature of the photosynthetic machinery Therefore 161
approaches designed to enhance photosynthesis such as introducing the high-light-resistant 162
D1 protein from a green alga that lives under extreme conditions (Treves et al 2016) into 163
crop plants do not appear promising Instead entire (sub)complexes with their internal 164
network of evolutionarily optimized interactions should be transferable between species 165
166
Exchange of non-conserved photosynthetic modules 167
Inspection of the repertoire of subunits of the photosynthetic machinery in the three model 168
species Synechocystis PCC6803 C reinhardtii and A thaliana which represent different 169
stages in the evolution of oxygen-generating photosynthesis shows that the most dramatic 170
changes in the photosynthetic proteome occurred during the transition from the 171
cyanobacterial endosymbiont (for which Synechocystis serves as a proxy) to the chloroplast 172
of unicellular algae (with C reinhardtii as proxy) (Fig 3 Supplemental Table 1) In 173
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8
particular phycobilisomes flavodoxin and several photosystem subunits were lost while 174
LHCs some novel photosystem subunits and several proteins involved in alternative electron 175
pathways or photoprotection evolved During the transition from algal chloroplasts to those 176
of flowering plants relatively few proteins were lost (eg flavodiiron proteins and the 177
canonical cytochrome c6) or acquired (Lhcb6CP24) (Fig 3 Supplemental Table 1) The 178
NAD(P)H dehydrogenase (NDH) complex involved in antimycin A-insensitive cyclic 179
electron flow (see Box 1) is a special case since the chloroplast NDH from flowering plants 180
traces back to the cyanobacterial complex but the complex was lost during evolution in C 181
reinhardtii (Fig 3 Supplemental Table 1) 182
Several attempts have been made to introduce photosynthetic proteins into species 183
that lack the corresponding homolog (Table 2) These heterologous expression approaches 184
have been successful for the soluble electron transporters flavodoxin cytochrome c6 and 185
flavodiiron proteins Indeed cyanobacterial flavodoxin can at least partially replace plant 186
ferredoxin and confer enhanced stress tolerance when expressed in addition to ferredoxin 187
(Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011) Similarly red algal 188
cytochrome c6 enhances growth and photosynthesis of A thaliana plants (Chida et al 2007) 189
Since A thaliana lacks a functional cytochrome c6 that can transfer electrons from the Cyt b6f 190
complex to PSI (Molina-Heredia et al 2003 Weigel et al 2003) it is plausible that the 191
more oxidized plastoquinone pool in the transgenic plants is a direct consequence of 192
additional PSI reduction mediated by the algal protein (Chida et al 2007) Interestingly it 193
seems to make no difference if an endogenous soluble electron transport protein (see Box 3) 194
or its heterologous equivalent from a distant species is overexpressed For instance 195
overexpression of the endogenous soluble proteins plastocyanin and ferredoxin can also 196
enhance growth in plants (Pesaresi et al 2009 Lin et al 2013 Chang et al 2017 Zhou et 197
al 2018) Interestingly and rather unexpectedly this concept can also work for certain 198
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
9
proteins that are part of multiprotein complexes (Simkin et al 2017 see Box 3) This 199
indicates that the quantity of such proteins is relevant for growth enhancement and not its 200
evolutionary origin 201
More recently the two Physcomitrella patens flavodiiron protein (FLV) genes FlvA 202
and FlvB were introduced into A thaliana which like other angiosperms has lost FLVs 203
during evolution (Yamamoto et al 2016) FLVs are the main mediators of pseudo-cyclic 204
electron flow in photosynthetic organisms but heterologous expression of FLVs in A 205
thaliana had no effect on steady-state photosynthesis and growth of the transgenic plants 206
(Yamamoto et al 2016) However the Arabidopsis FLV lines displayed higher 207
photosynthetic yields just after the onset of actinic light following a long dark adaptation 208
suggesting that the FLVs mediated a large electron sink during the induction of 209
photosynthesis In fluctuating light experiments the Arabidopsis FLV lines had much less 210
PSI acceptor side limitation implying that the large FLV-mediated electron sink makes 211
photosynthesis more resistant to the fluctuating light Consequently this protective effect of 212
FLVs is more pronounced in Arabidopsis lines that are more sensitive to fluctuating light like 213
the pgr5 mutant defective in antimycin A-sensitive cyclic electron flow (see Box 1 Leister 214
and Shikanai 2013 Yamamoto et al 2016) Similarly expression of FLVs in a rice (Oryza 215
sativa) line with markedly reduced cyclic electron flow restored CO2 assimilation and growth 216
rate to wild-type levels (Wada et al 2018) Like FLVs LHcxLHCSR proteins play a role in 217
photoprotection in green algae and mosses but have been lost in angiosperms during 218
evolution Heterologous expression of P patens LHCSR1 in Nicotiana benthamiana and 219
Nicotiana tabacum yielded an active protein that has properties similar if not identical to 220
those of moss LHCSR1 (Pinnola et al 2015) 221
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10
Efforts to create LHCII complexes like those in plants by heterologously expressing 222
the membrane-spanning light-harvesting chlorophyll ab-binding protein Lhcb from Pisum 223
sp (pea) in Synechocystis were unsuccessful 224
Although the pea Lhcb protein was synthesized in Synechocystis and integrated into 225
the membrane it did not accumulate to steady-state levels detectable by immunoblot analysis 226
(He et al 1999) Possible explanations are that Lhcb is rapidly degraded either because its 227
ldquounfamiliarrdquo structure makes it a good substrate for the cyanobacterial proteolytic system or 228
it cannot foldassemble properly due to the lack of plant-specific pigments or assembly 229
factors Interestingly chlorophyll b production (see Box 2) after introduction of plant 230
chlorophyll a oxygenase (CAO) is boosted when Lhcb is expressed even though LHCII does 231
not accumulate in detectable amounts (Xu et al 2001) 232
Even soluble multiprotein complexes can be heterologously expressed as has been 233
impressively demonstrated from the carbon-fixation end of photosynthesis For example by 234
coexpression of five auxiliary factors a functional plant RuBisCo complex was successfully 235
assembled in Escherichia coli (Aigner et al 2017) This result is in line with the ldquofrozen 236
metabolic staterdquo concept showing that photosynthetic proteins embedded in a network of 237
interactions with other proteins and auxiliary factors can be introduced into distantly related 238
species but only with their own interaction networks While Gimpel et al (2016) showed that 239
efficient gene expression needs to be accounted for when designing synthetic modules for the 240
transfer of photosystem subunits from one species to another Aigner et al (2017) 241
demonstrated that auxiliary factors required for the biogenesis of photosynthetic 242
(sub)complexes need to be considered in such experiments adding additional facets to the 243
ldquofrozen metabolic staterdquo concept 244
Auxiliary factors required for the accumulation of photosynthetic multiprotein 245
complexes include (i) cofactors like iron-sulfur clusters and pigments (see Box 2) (ii) 246
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
11
chaperones that are required for the insertion of co-factors (eg pigments into LHCs Schmid 247
2008) and (iii) assembly factors Assembly factors are required to support the stepwise 248
assembly and functionality of the multiproteinpigment complexes and many of these are 249
conserved between photosynthetic species (Nixon et al 2010 Nickelsen and Rengstl 2013 250
Jensen and Leister 2014) Therefore the exchange of entire multiprotein complexes between 251
distantly related species will not be simple due to the repertoire of auxiliary factors that has 252
markedly changed during evolution Since the species that Gimpel et al (2016) studied were 253
closely related this aspect could be neglected In consequence the impact of these auxiliary 254
factors on the formation of multiproteinpigment complexes will have to be fully elucidated 255
to understand which factors are sufficient to assemble a photosynthetic multiprotein complex 256
previous (genetic) approaches only identified factors required for this process Hence the 257
transfer of entire photosynthetic (sub)complexes between distantly related species by a 258
ldquosynthetic photosynthetic modulerdquo must include entire sets of strongly interacting proteins (to 259
address the ldquofrozen metabolic staterdquo) as well as all genetic elements and auxiliary factors 260
sufficient for efficient expression biogenesis and function of the proteins in the module 261
262
Bio-bio hybrids using photosynthesis as an electron source for unrelated biological 263
processes 264
The idea of using the reducing power of photosynthesis to drive unrelated metabolic reactions 265
has inspired several biotechnological concepts The photosynthesis-driven formation of 266
secondary metabolites has been demonstrated in vivo whereas light-driven generation of H2 267
by bio-bio hybrids so far works only in vitro and is closely related to bio-nano approaches 268
Therefore coupling of photosynthesis to previously unrelated pathways is discussed here 269
first followed by bio-bio systems for H2 generation 270
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12
Redirection of PSI reducing equivalents to drive reactions catalyzed by cytochrome 271
P450 enzymes has been achieved in vivo by genetic modifications of plants and 272
cyanobacteria (Lassen et al 2014a Nielsen et al 2016 Mellor et al 2017) Cytochrome 273
P450s constitute the largest family of plant enzymes that acts on various endogenous and 274
xenobiotic molecules (Rasool and Mohamed 2016) Their extreme versatility and 275
irreversibility of catalyzed reactions make these enzymes very attractive for use in 276
biotechnology medicine and phytoremediation P450s are monooxygenases that insert an 277
oxygen atom into hydrophobic molecules which enhances their reactivity and hydrophilicity 278
Most eukaryotic P450s require NADPHcytochrome P450 reductase as the electron donor 279
The ER membrane is generally accepted to be the primary subcellular repository of 280
eukaryotic P450s and their NADPHcytochrome P450 reductase By relocating cytochrome 281
P450s to the chloroplasts the reducing power of photosynthesis can be directly targeted to 282
the reactions catalyzed by these enzymes thus providing the basis for the large-scale 283
production of valuable products Initial attempts to couple P450s with photosynthesis were 284
conducted in vitro (Table 3 Fig 4A) Spinach chloroplasts were combined with microsomes 285
from yeast cells that had been stably transformed with a fusion gene expressing the rat 286
CYP1A1-NADPHcytochrome P450 reductase fusion enzyme (Kim et al 1996) These 287
experiments confirmed that it is feasible to drive P450-mediated reactions using electrons 288
derived from photosynthetically generated NADPH Intriguingly the NADPHcytochrome 289
P450 reductase is not always essential as demonstrated by co-incubating CYP79A1 from 290
sorghum (Sorghum bicolor) with barley (Hordeum vulgare) PSI and employing ferredoxin to 291
directly deliver electrons from PSI to the P450 (Jensen et al 2011) This approach was also 292
shown to be practicable in vivo CYP79A1 either alone or in combination with CYP71E1 293
and the UDP-glucosyltransferase UGT85B1 was first targeted in vivo to cyanobacterial or 294
plant thylakoid membranes where they catalyzed the same reactions as in their original 295
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
13
cellular compartment (the ER) utilizing photosynthetically reduced ferredoxin as the electron 296
donor (Nielsen et al 2013 Lassen et al 2014b Gnanasekaran et al 2016 Wlodarczyk et 297
al 2016) Genetic fusions have also been employed for the coupling of P450s to PSI 298
CYP79A1 has been fused to either cyanobacterial PsaM or Arabidopsis ferredoxin and the 299
engineered enzyme showed light-driven activity both in vivo and in vitro (Lassen et al 300
2014b Mellor et al 2016) In the latter case the efficiency of the system was enhanced 301
because the fusion could compete better with endogenous electron sinks coupled to metabolic 302
pathways (Mellor et al 2016) 303
In contrast to PSI-P450 hybrids PSI-hydrogenase hybrids currently function only in 304
vitro Unlike fossil fuels H2 is environmentally benign as it produces only water when 305
combusted Therefore in principle harnessing of the reducing power of photosynthesis for 306
the direct production of H2 (ie ultimately using sunlight and water) would yield a fully 307
sustainable system of energy generation PSI but not PSII provides a standard midpoint 308
potential that is sufficiently negative to power the reduction of protons to H2 (Utschig et al 309
2015) Hence approaches have been developed to engineer PSI to produce H2 either as 310
replacement or in addition to its natural product NADPH (see Figure 1 in Box 1) by 311
redirecting PSI electrons to a catalytic component This catalytic component can be abiotic or 312
biotic (hydrogenases) The feasibility of coupling H2 generation to photosynthesis was 313
demonstrated 45 years ago by mixing chloroplast preparations with ferredoxin and 314
hydrogenase (Benemann et al 1973) Twenty-five years later hydrogen evolution by direct 315
electron transfer (without ferredoxin) from PSI to hydrogenases was accomplished for the 316
first time (McTavish 1998) 317
Hydrogenases catalyze the reversible interconversion of H2 into protons and electrons 318
and are widespread in nature they occur in bacteria and archaea but also in some eukarya In 319
vivo hydrogenases can mediate photosynthetic H2 production albeit mostly indirectly or 320
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
14
under anaerobic conditions due to their oxygen sensitivity (Ghirardi 2015 Oey et al 2016) 321
Hydrogenases can be classified according to their metal-ion composition eg [NiFe] and 322
[FeFe] hydrogenases (Lubitz et al 2014 Martin and Frymier 2017) [FeFe] hydrogenases 323
preferentially catalyze proton reduction and can evolve H2 at high rates but are extremely 324
sensitive to O2 and are the only type of hydrogenases found in eukaryotic microorganisms 325
[NiFe] hydrogenases are less sensitive to O2 but preferentially oxidize H2 under 326
physiological conditions (Lubitz et al 2014) In vitro both types of hydrogenases have been 327
directly linked to PSI (Table 3 Fig 4B) PSI-[NiFe] hydrogenase complexes have been 328
generated by fusing the hydrogenase genetically to the PsaE protein (Ihara et al 2006a) PSI-329
[FeFe] hydrogenase complexes were obtained by genetically fusing the hydrogenase to 330
ferredoxin (Yacoby et al 2011) or covalently linking the FeS clusters present in the 331
hydrogenase to PSI via a molecular wire (Lubner et al 2010 Lubner et al 2011) 332
Two parameters characterize the efficiency of these in-vitro systems their H2 333
production rate and longevity While low rates of H2 production (in the range from 01 to 10 334
μmol H2mg chlorophyllh) were described for the early chloroplast extract experiments and 335
genetic fusions of PSI to [NiFe] or [FeFe] hydrogenases (McTavish 1998 Ihara et al 2006a 336
Yacoby et al 2011) higher rates of between 2000 and 3000 μmol H2mg chlorophyllh have 337
been achieved with wired PSI-[FeFe] hydrogenase complexes and genetically fused PSI-338
[NiFe] hydrogenase complexes assembled on a gold electrode (Krassen et al 2009 Lubner 339
et al 2011) Few data are available with respect to the longevity of the PSI-hydrogenase 340
systems however a minimum lifetime of 64 days was reported for a wired [FeFe] 341
hydrogenase-PSI complex at room temperature and under ambient illumination (Lubner et 342
al 2010) 343
The future use of hydrogenases in photosynthesis-driven H2 production will strongly 344
depend on whether or not it is possible to overcome the O2 sensitivity of many hydrogenases 345
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
15
by for instance employing oxygen-tolerant [NiFe] hydrogenases (Burgdorf et al 2005 346
Schiffels et al 2013) If this is not possible their efficient use in vivo in thylakoids which 347
inevitably generate O2 during linear electron flow will be impossible However as 348
demonstrated with the gold surface system (Krassen et al 2009) the design of novel 349
matrices into which the hybrid system can be incorporated may markedly enhance the 350
efficiency 351
352
Bio-nano hybrids Use of photosynthesis as a source of electrons for non-biological 353
processes 354
From bio-bio hybrids it is only a small step to developing bio-nano hybrids as demonstrated 355
by PSI hybrids that employ abiotic catalysts for photosynthetic hydrogen production instead 356
of hydrogenase In fact abiotic catalysts have the advantage of bypassing the lability of 357
hydrogenases in the presence of oxygen PSI-platinum hybrids have been produced by 358
combining PSI with platinum nanoparticles (either directly or via tethering by nanowires) or 359
platinum nanoclusters (Kargul et al 2012 Fukuzumi 2015 Utschig et al 2015) (Fig 5A 360
Table 4) Current PSI-platinum hybrids are less efficient than the most advanced PSI-361
hydrogenase systems but are extremely robust (Utschig et al 2015) However future 362
widespread usage of the PSI-platinum system will be limited by the high cost of platinum A 363
more economical alternative to precious metals are earth-abundant molecular catalysts 364
However hybrids consisting of PSI and earth-abundant molecular catalysts have a much 365
shorter working life than platinum-based configurations (Utschig et al 2015) likely due to 366
instability of the molecular catalyst 367
PSI-based photocurrent-producing devices constitute another class of photosynthesis-368
derived nano-bio systems (Table 4 Fig 5) In such devices PSI is immobilized onto 369
electrodes Many variants of this concept have been tested such as varying the electrode 370
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16
materials immobilizationorientation strategies andor artificial redox mediators (Nguyen and 371
Bruce 2014 Janna Olmos and Kargul 2015 Plumereacute and Nowaczyk 2017 Kargul et al 372
2018) PSI must be immobilized on the electrode surface in such a way that electron transfers 373
between the electrodes and the oxidizing (P700) and reducing (FB - the terminal [4Fe-4S] 374
cluster or an intermediate electron transporter) sites of PSI can proceed with the required 375
efficiency Electrons are transferred between the electrodes and the oxidizing or reducing 376
sides of PSI either by a diffusible redox mediator or molecular wires Examples of electrode 377
materials and redox mediators are provided in Table 4 After P700 photo-excitation electrons 378
are transferred from P700 via several factors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB) to the 379
iron-sulfur cluster FB (see legend of Box 1) As in the case of PSI-hydrogenase and PSI-380
platinum nanoparticles PSI can be wired to its electrodes This has been achieved by wiring 381
the A1 cofactor (phylloquinone) to the substrate surface such that electrons are directly 382
transferred from A1 to the electrode thus bypassing the downstream FeS clusters (FX FA FB) 383
in the stromal domain of PSI (Terasaki et al 2007 Miyachi et al 2009 Terasaki et al 384
2009 Miyachi et al 2010) 385
Modifications of PSI have been utilized to enhance the efficiency of the photocurrent-386
generating system (Das et al 2004 Frolov et al 2005 Carmeli et al 2010) As mentioned 387
previously fusions to the stroma-faced PSI subunit PsaE can be used to link new components 388
to PSI however in this case PsaD fusions were used To this end recombinant His-tagged 389
PsaD was immobilized on the functionalized electrode surface which was then exposed to 390
native PSI complexes resulting in immobilized PSI with P700 facing away from the 391
electrode (Das et al 2004) Another way to control the orientation of PSI during 392
immobilization involves introducing cysteine mutations To allow for direct thiol coupling to 393
an Au surface various residues on the lumen-exposed face of PSI were replaced by cysteine 394
and tested (Frolov et al 2005) PSI attachment was achieved with all single mutants even 395
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17
those placed further from the P700 site suggesting that a specific location is not required as 396
long as the cysteine is exposed at the luminal surface of PSI The concept of targeted 397
attachment via introduced cysteine residues was exploited in subsequent studies to link PSI to 398
maleimide-functionalized gallium arsenide (Frolov et al 2008) to immobilize PSI between 399
the substrate and a metallized scanning near-field optical microscopy tip (Gerster et al 400
2012) and to bind PSI to carbon nanotubes (Kaniber et al 2010) Another modification of 401
PSI is represented by the attachment of plasmonic metal nanoparticles which resulted in 402
enhanced light absorption (Carmeli et al 2010) even in the green part of the solar spectrum 403
that is not normally absorbed (Szalkowski et al 2017) This suggests that it is possible to 404
enhance light absorption by PSI in vitro through the attachment of abiotic components that 405
act as optical antennae to extend the spectrum of photons available for P700 activation 406
Taken together these efforts demonstrate that PSI-based photocurrent-generating 407
systems are still in an exploratory phase with many variants under development In the next 408
phase viable building blocks and reference systems should be established that can serve as 409
starting points for the systematic engineering of superior systems This will require the 410
modification of PSI for optimal effect in artificial systems and will undoubtedly differ 411
substantially from the original environment in which PSI was molded by biological 412
evolution 413
414
Concluding remarks and outlook 415
Enhancing photosynthesis and growth can be achieved by a simple overexpression of certain 416
photosynthetic proteins and PSI can be coupled to previously unconnected biotic or abiotic 417
components to generate valuable compounds hydrogen or electricity Moreover entire 418
photosynthetic complexes can be functionally expressed in distantly related species (as 419
demonstrated for RuBisCO Aigner et al 2017) Thus what are the next goals and which 420
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18
challenges need to be overcome Two challenges for the in vivo systems are obvious (i) 421
enhancing the efficiency of in-vivo bio-bio hybrids and (ii) upscaling the size of ldquosynthetic 422
photosynthetic modulesrdquo to cover entire photosystems or complex antenna systems 423
With respect to the enhancement of in vivo cyanobacterial and algal systems 424
harboring hybrid configurations in which photosynthesis directly drives previously 425
unconnected pathways the use of laboratory evolution offers a unique opportunity to tailor 426
these systems for their intended purpose Laboratory evolution utilizes the high rate of 427
evolution typical in microbial systems (in particular if suitable selection conditions can be 428
designed) to fine tune and optimize processes through selection of advantageous genetic 429
variation While this strategy has been employed in E coli and yeast with impressive success 430
now photosynthetic microbial systems are emerging as attractive targets for this approach 431
(Leister 2017) 432
The exchange of entire multiprotein complexes between distantly related species will 433
not be a simple exercise because the ldquofrozen metabolic staterdquo of the core photosynthetic 434
complexes will necessitate the exchange of major parts of photosystems rather than 435
individual subunits The RuBisCO case study by Aigner et al (2017) represents of promising 436
proof of principle but one needs to consider that the synthetic RuBisCO module comprised 437
only the two different subunits present in the mature complex and five auxiliary factors for its 438
assembly Entire photosystems will require much larger ldquosynthetic photosynthetic modulesrdquo 439
and many of the auxiliary factors have not been identified yet Therefore when designing 440
these complex ldquosynthetic photosynthetic modulesrdquo we will identify the set of components 441
that are sufficient (and not only necessary) to drive photosynthesis providing an 442
unprecedentedly deep understanding of this fundamental and complex process 443
Given that the problems described above can be solved what will be the next steps in 444
the synthetic biology of the light reactions of photosynthesis The combination of ldquosynthetic 445
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19
photosynthetic modulesrdquo from diverse species could allow the design of novel variants of 446
photosynthesis Numerous instances of such ldquorecombined photosynthetic variantsrdquo can be 447
imagined including plants that employ cyanobacteria-derived phycobilisomes for highly 448
sufficient photosynthesis under low light conditions cyanobacteria that employ plant-derived 449
LHCs as antenna to shift light saturation of photosynthesis to higher intensities or the 450
integration of cyanobacterial Chl d and Chl f (which can absorb far-red and near infra-red 451
light) into algal or plant photosynthesis to expand the spectral region available to drive 452
photosynthesis (Loughlin et al 2013 Ho et al 2016) Moreover such variants of 453
recombined photosynthesis could be further optimized by laboratory evolution within a 454
suitable microbial chassis However such recombined photosynthetic variants cannot be 455
considered a truly novel type of photosynthesis because they would only bring preexisting 456
pieces together that evolution has separated Nevertheless they could be an important step 457
towards the ambitious goal to design truly novel ldquosynthetic photosynthetic modulesrdquo that 458
contain more efficient substitutes of the ldquofrozen metabolic accidentsrdquo discussed above 459
Ample proof of functionality for in-vivo hybrids (between photosynthesis and 460
previously unconnected metabolic pathways) and in-vitro hybrids (between PSI and biotic or 461
abiotic catalysts) has been obtained but such systems will only be commercially successful if 462
they can compete with established non-biological systems Tailoring of PSI in cyanobacteria 463
where techniques like gene replacement and gene modification are routine may contribute to 464
further improving the efficiency and robustness of in vitro and in vivo hybrids One 465
promising route could be to identify those parts of the original PSI (which evolved under 466
constraints imposed by the cyanobacterial cell) that are necessary for hybrid devices (a 467
ldquominimalrdquo PSI) Such bio-nano systems can be optimized to include novel non-biological 468
components that replace or complement natural pigments andor the protein-based backbone 469
of photosystems going far beyond the limited toolbox of Naturersquos chemistry Such novel 470
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20
systems inspired by natural photosynthesis could be used to engage biologists in the design 471
of fundamentally different types of photosynthesis in living organisms 472
473
SUPPLEMENTAL DATA 474
Supplemental Table 1 Absencepresence of photosynthetic proteins in the three model 475
species Synechocystis PCC6803 (Syn) Chlamydomonas reinhardtii (Cr) and Arabidopsis 476
thaliana (At) 477
478
ACKNOWLEDGMENTS 479
The authors thank Paul Hardy for critical reading of the manuscript 480
481
482
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21
Table 1 Replacement of conserved individual or multiple photosynthetic proteins 483
GeneProtein Description Protein
identity
Reference
psbAD1 Synechocystis D1 was replaced by its homolog from
Poa annua which resulted in slower growth This is
likely to be due to increased charge recombination
between the donor and acceptor sides of the reaction
center
86 Nixon et al
1991
psbBCP47 Synechocystis CP47 was replaced by its homolog
from spinach and photoautotrophy was lost
80 Vermaas et
al 1996
psbCCP43 Synechocystis CP43 was replaced by its homolog
from spinach and photoautotrophy was lost
85 Carpenter et
al 1993
psbHPsbH Synechocystis PsbH was replaced by its counterpart
from maize The resulting strain displayed increased
light sensitivity and lower chlorophyll content
78 Chiaramonte
et al 1999
psaAPsaA Synechocystis PsaA was replaced by its equivalent
from A thaliana This resulted in reduced photo-
autotrophical growth and a drastically reduced
ChlPC ratio
80 Viola et al
2014
psbABCDEF
D1CP47CP43D2
Cyt b559-+
All six core subunits of C reinhardtii were replaced
by their counterparts from two different green algae
(V carteri and S obliquus) The resulting strains
were photoautotrophic but showed reduced
photosynthetic efficiency and the heterologous
82 -
99
Gimpel et al
2016
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22
proteins reached only between 10 and 20 of the
levels of those they replaced
484
485
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23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
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24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
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25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
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26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
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28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
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32
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566
Aigner H Wilson RH Bracher A Calisse L Bhat JY Hartl FU Hayer-Hartl M (2017) 567
Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
chloroplast-ferredoxin-hydrogenase system Proc Natl Acad Sci U S A 70 2317-2320 571
Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
complements ferredoxin deficiency in knocked-down transgenic tobacco plants Plant 574
J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
photosynthesis for energy production Curr Opin Chem Biol 17 457-461 577
Burgdorf T Lenz O Buhrke T van der Linden E Jones AK Albracht SP Friedrich B 578
(2005) [NiFe]-hydrogenases of Ralstonia eutropha H16 modular enzymes for 579
oxygen-tolerant biological hydrogen oxidation J Mol Microbiol Biotechnol 10 181-580
96 581
Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
(2010) Broad band enhancement of light absorption in photosystem I by metal 583
nanoparticle antennas Nano Lett 10 2069-2074 584
Carpenter SD Ohad I Vermaas WF (1993) Analysis of chimeric spinachcyanobacterial 585
CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
the water-splitting system of Photosystem II Biochim Biophys Acta 1144 204-212 587
Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
Eur J Biochem 260 833-843 593
Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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33
Ciornii D Riedel M Stieger KR Feifel SC Hejazi M Lokstein H Zouni A Lisdat F 598
(2017) Bioelectronic Circuit on a 3D Electrode Architecture Enzymatic Catalysis 599
Interconnected with Photosystem I J Am Chem Soc 139 16478-16481 600
Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel 601
genetic diversity Philos Trans R Soc Lond B Biol Sci 372 602
Das R Kiley PJ Segal M Norville J Yu AA Wang L Trammell SA Reddick LE 603
Kumar R Stellacci F Lebedev N Schnur J Bruce BD Zhang S Baldo M (2004) 604
Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
by thermal dissipation of excess energy Biochem Soc Trans 38 651-660 608
Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
device by direct chemical binding of the photosynthetic reaction center protein to 610
metal surfaces Advanced Materials 17 2434-2437 611
Frolov L Rosenwaks Y Richter S Carmeli C Carmeli I (2008) Photoelectric junctions 612
between GaAs and photosynthetic reaction center protein J Phys Chem C 112 613
13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I 617
Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
reinhardtii ACS Synth Biol 5 589-596 624
Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
state biophotovoltaic cells containing photosystem I Adv Mater 26 4863-4869 630
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34
Glowacka K Kromdijk J Kucera K Xie J Cavanagh AP Leonelli L Leakey ADB Ort 631
DR Niyogi KK Long SP (2018) Photosystem II subunit S overexpression increases 632
the efficiency of water use in a field-grown crop Nat Commun 9 868 633
Gnanasekaran T Karcher D Nielsen AZ Martens HJ Ruf S Kroop X Olsen CE 634
Motawie MS Pribil M Moller BL Bock R Jensen PE (2016) Transfer of the 635
cytochrome P450-dependent dhurrin pathway from Sorghum bicolor into Nicotiana 636
tabacum chloroplasts for light-driven synthesis J Exp Bot 67 2495-2506 637
Haniewicz P Abram M Nosek L Kirkpatrick J El-Mohsnawy E Olmos JDJ Kouřil 638
R Kargul JM (2018) Molecular mechanisms of photoadaptation of photosystem I 639
supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
harvesting chlorophyll ab-binding protein in Synechocystis sp PCC 6803 Eur J 643
Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
synthase is a highly divergent paralog of PsbA of photosystem II Science 353 646
Holt NE Fleming GR Niyogi KK (2004) Toward an understanding of the mechanism of 647
nonphotochemical quenching in green plants Biochemistry 43 8281-8289 648
Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
D Kamachi T Okura I (2006a) Light-driven hydrogen production by a hybrid 650
complex of a [NiFe]-hydrogenase and the cyanobacterial photosystem I Photochem 651
Photobiol 82 676-682 652
Ihara M Nakamoto H Kamachi T Okura I Maeda M (2006b) Photoinduced hydrogen 653
production by direct electron transfer from photosystem I cross-linked with 654
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Olmos JD Kargul J (2015) A quest for the artificial leaf Int J Biochem Cell Biol 656
66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
Pawlak D Kargul J (2017) Biofunctionalisation of p-doped silicon with cytochrome 659
c553 minimises charge recombination and enhances photovoltaic performance of the 660
all-solid-state photosystem I-based biophotoelectrode RSC Adv 7 47854-47866 661
Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations 662
ACS Chem Biol 6 533-539 663
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35
Jensen PE Leister D (2014) Chloroplast evolution structure and functions F1000Prime 664
Rep 6 40 665
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip 666
functionalization of carbon nanotubes with photosystem I J Am Chem Soc 132 667
2872-2873 668
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and 669
its application in biomimetic solar-to-fuel systems J Plant Physiol 169 1639-1653 670
Kargul J Bubak G Andryianau G (2018) Biophotovoltaic systems based on 671
photosynthetic complexes In Wandelt K (Ed) Encyclopedia of Interfacial 672
Chemistry Surface Science and Electrochemistry vol 7 pp 43-63 673
Kim YS Hara M Ikebukuro K Miyake J Ohkawa H Karube I (1996) Photo-induced 674
activation of cytochrome P450reductase fusion enzyme coupled with spinach 675
chloroplasts Biotechnol Tech 10 717minus720 676
Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic 677
hydrogen production by a hybrid complex of photosystem I and [NiFe]-hydrogenase 678
ACS Nano 3 4055-4061 679
Kromdijk J Glowacka K Leonelli L Gabilly ST Iwai M Niyogi KK Long SP (2016) 680
Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
Kubota H Sakurai I Katayama K Mizusawa N Ohashi S Kobayashi M Zhang P Aro 683
EM Wada H (2010) Purification and characterization of photosystem I complex 684
from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim 685
Biophys Acta 1797 98-105 686
Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future 702
by engineering crop photosynthesis and yield potential Cell 161 56-66 703
Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
(2011) Solar hydrogen-producing bionanodevice outperforms natural photosynthesis 709
Proc Natl Acad Sci U S A 108 20988-20991 710
Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
production Biochemistry 49 10264-10266 713
Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
organisms using whole-cell and cell-free systems Appl Biochem Biotechnol 183 715
503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
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Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
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biosynthesis ACS Chem Biol 11 1862-1869 721
Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous 722
enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
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(Camb) 46 2557-2559 727
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
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37
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low-light stress J Exp Bot 56 389-393 734
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J 735
Nanosci Nanotechnol 9 1709-1713 736
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photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello 742
Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in 748
understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in 750
Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
complex Plant Cell 3 383-395 752
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
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38
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24340-24354 767
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins 768
Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
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Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
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Lett 581 2768-2775 776
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3619-3639 782
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2189 785
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Protein Increases Electron Transport Rates and Biomass Yield Plant Physiol 175 787
134-145 788
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Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
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photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
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Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium 816
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Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
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Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
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40
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843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
7
Photoautotrophy was not affected by the exchange of this synthetic biology module although 149
the fully altered strains performed suboptimally compared to strains in which only 1ndash5 genes 150
were exchanged However in control experiments where the synthetic C reinhardtii six-gene 151
module was re-introduced to the C reinhardtii deletion strain that lacked all six genes only 152
about 86 of wild-type PSII functionality was rescued Tentative explanations for this 153
decreased efficiency include (i) off-target effects of the PSII gene deletions on the operon 154
components and tRNA genes associated with these PSII loci (ii) misregulation of the 155
transferred PSII genes because their expression cassettes lacked unidentified cis-acting DNA 156
elements and (iii) perturbation of polycistron-dependent post-transcriptional regulation of the 157
transformed genes since they were no longer part of an operon (Gimpel et al 2016) 158
Taken together the outcomes of these replacement experiments indicate that 159
exchanging conserved photosynthetic proteins from multiprotein complexes can be 160
problematic given the highly integrated nature of the photosynthetic machinery Therefore 161
approaches designed to enhance photosynthesis such as introducing the high-light-resistant 162
D1 protein from a green alga that lives under extreme conditions (Treves et al 2016) into 163
crop plants do not appear promising Instead entire (sub)complexes with their internal 164
network of evolutionarily optimized interactions should be transferable between species 165
166
Exchange of non-conserved photosynthetic modules 167
Inspection of the repertoire of subunits of the photosynthetic machinery in the three model 168
species Synechocystis PCC6803 C reinhardtii and A thaliana which represent different 169
stages in the evolution of oxygen-generating photosynthesis shows that the most dramatic 170
changes in the photosynthetic proteome occurred during the transition from the 171
cyanobacterial endosymbiont (for which Synechocystis serves as a proxy) to the chloroplast 172
of unicellular algae (with C reinhardtii as proxy) (Fig 3 Supplemental Table 1) In 173
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8
particular phycobilisomes flavodoxin and several photosystem subunits were lost while 174
LHCs some novel photosystem subunits and several proteins involved in alternative electron 175
pathways or photoprotection evolved During the transition from algal chloroplasts to those 176
of flowering plants relatively few proteins were lost (eg flavodiiron proteins and the 177
canonical cytochrome c6) or acquired (Lhcb6CP24) (Fig 3 Supplemental Table 1) The 178
NAD(P)H dehydrogenase (NDH) complex involved in antimycin A-insensitive cyclic 179
electron flow (see Box 1) is a special case since the chloroplast NDH from flowering plants 180
traces back to the cyanobacterial complex but the complex was lost during evolution in C 181
reinhardtii (Fig 3 Supplemental Table 1) 182
Several attempts have been made to introduce photosynthetic proteins into species 183
that lack the corresponding homolog (Table 2) These heterologous expression approaches 184
have been successful for the soluble electron transporters flavodoxin cytochrome c6 and 185
flavodiiron proteins Indeed cyanobacterial flavodoxin can at least partially replace plant 186
ferredoxin and confer enhanced stress tolerance when expressed in addition to ferredoxin 187
(Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011) Similarly red algal 188
cytochrome c6 enhances growth and photosynthesis of A thaliana plants (Chida et al 2007) 189
Since A thaliana lacks a functional cytochrome c6 that can transfer electrons from the Cyt b6f 190
complex to PSI (Molina-Heredia et al 2003 Weigel et al 2003) it is plausible that the 191
more oxidized plastoquinone pool in the transgenic plants is a direct consequence of 192
additional PSI reduction mediated by the algal protein (Chida et al 2007) Interestingly it 193
seems to make no difference if an endogenous soluble electron transport protein (see Box 3) 194
or its heterologous equivalent from a distant species is overexpressed For instance 195
overexpression of the endogenous soluble proteins plastocyanin and ferredoxin can also 196
enhance growth in plants (Pesaresi et al 2009 Lin et al 2013 Chang et al 2017 Zhou et 197
al 2018) Interestingly and rather unexpectedly this concept can also work for certain 198
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9
proteins that are part of multiprotein complexes (Simkin et al 2017 see Box 3) This 199
indicates that the quantity of such proteins is relevant for growth enhancement and not its 200
evolutionary origin 201
More recently the two Physcomitrella patens flavodiiron protein (FLV) genes FlvA 202
and FlvB were introduced into A thaliana which like other angiosperms has lost FLVs 203
during evolution (Yamamoto et al 2016) FLVs are the main mediators of pseudo-cyclic 204
electron flow in photosynthetic organisms but heterologous expression of FLVs in A 205
thaliana had no effect on steady-state photosynthesis and growth of the transgenic plants 206
(Yamamoto et al 2016) However the Arabidopsis FLV lines displayed higher 207
photosynthetic yields just after the onset of actinic light following a long dark adaptation 208
suggesting that the FLVs mediated a large electron sink during the induction of 209
photosynthesis In fluctuating light experiments the Arabidopsis FLV lines had much less 210
PSI acceptor side limitation implying that the large FLV-mediated electron sink makes 211
photosynthesis more resistant to the fluctuating light Consequently this protective effect of 212
FLVs is more pronounced in Arabidopsis lines that are more sensitive to fluctuating light like 213
the pgr5 mutant defective in antimycin A-sensitive cyclic electron flow (see Box 1 Leister 214
and Shikanai 2013 Yamamoto et al 2016) Similarly expression of FLVs in a rice (Oryza 215
sativa) line with markedly reduced cyclic electron flow restored CO2 assimilation and growth 216
rate to wild-type levels (Wada et al 2018) Like FLVs LHcxLHCSR proteins play a role in 217
photoprotection in green algae and mosses but have been lost in angiosperms during 218
evolution Heterologous expression of P patens LHCSR1 in Nicotiana benthamiana and 219
Nicotiana tabacum yielded an active protein that has properties similar if not identical to 220
those of moss LHCSR1 (Pinnola et al 2015) 221
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10
Efforts to create LHCII complexes like those in plants by heterologously expressing 222
the membrane-spanning light-harvesting chlorophyll ab-binding protein Lhcb from Pisum 223
sp (pea) in Synechocystis were unsuccessful 224
Although the pea Lhcb protein was synthesized in Synechocystis and integrated into 225
the membrane it did not accumulate to steady-state levels detectable by immunoblot analysis 226
(He et al 1999) Possible explanations are that Lhcb is rapidly degraded either because its 227
ldquounfamiliarrdquo structure makes it a good substrate for the cyanobacterial proteolytic system or 228
it cannot foldassemble properly due to the lack of plant-specific pigments or assembly 229
factors Interestingly chlorophyll b production (see Box 2) after introduction of plant 230
chlorophyll a oxygenase (CAO) is boosted when Lhcb is expressed even though LHCII does 231
not accumulate in detectable amounts (Xu et al 2001) 232
Even soluble multiprotein complexes can be heterologously expressed as has been 233
impressively demonstrated from the carbon-fixation end of photosynthesis For example by 234
coexpression of five auxiliary factors a functional plant RuBisCo complex was successfully 235
assembled in Escherichia coli (Aigner et al 2017) This result is in line with the ldquofrozen 236
metabolic staterdquo concept showing that photosynthetic proteins embedded in a network of 237
interactions with other proteins and auxiliary factors can be introduced into distantly related 238
species but only with their own interaction networks While Gimpel et al (2016) showed that 239
efficient gene expression needs to be accounted for when designing synthetic modules for the 240
transfer of photosystem subunits from one species to another Aigner et al (2017) 241
demonstrated that auxiliary factors required for the biogenesis of photosynthetic 242
(sub)complexes need to be considered in such experiments adding additional facets to the 243
ldquofrozen metabolic staterdquo concept 244
Auxiliary factors required for the accumulation of photosynthetic multiprotein 245
complexes include (i) cofactors like iron-sulfur clusters and pigments (see Box 2) (ii) 246
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11
chaperones that are required for the insertion of co-factors (eg pigments into LHCs Schmid 247
2008) and (iii) assembly factors Assembly factors are required to support the stepwise 248
assembly and functionality of the multiproteinpigment complexes and many of these are 249
conserved between photosynthetic species (Nixon et al 2010 Nickelsen and Rengstl 2013 250
Jensen and Leister 2014) Therefore the exchange of entire multiprotein complexes between 251
distantly related species will not be simple due to the repertoire of auxiliary factors that has 252
markedly changed during evolution Since the species that Gimpel et al (2016) studied were 253
closely related this aspect could be neglected In consequence the impact of these auxiliary 254
factors on the formation of multiproteinpigment complexes will have to be fully elucidated 255
to understand which factors are sufficient to assemble a photosynthetic multiprotein complex 256
previous (genetic) approaches only identified factors required for this process Hence the 257
transfer of entire photosynthetic (sub)complexes between distantly related species by a 258
ldquosynthetic photosynthetic modulerdquo must include entire sets of strongly interacting proteins (to 259
address the ldquofrozen metabolic staterdquo) as well as all genetic elements and auxiliary factors 260
sufficient for efficient expression biogenesis and function of the proteins in the module 261
262
Bio-bio hybrids using photosynthesis as an electron source for unrelated biological 263
processes 264
The idea of using the reducing power of photosynthesis to drive unrelated metabolic reactions 265
has inspired several biotechnological concepts The photosynthesis-driven formation of 266
secondary metabolites has been demonstrated in vivo whereas light-driven generation of H2 267
by bio-bio hybrids so far works only in vitro and is closely related to bio-nano approaches 268
Therefore coupling of photosynthesis to previously unrelated pathways is discussed here 269
first followed by bio-bio systems for H2 generation 270
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12
Redirection of PSI reducing equivalents to drive reactions catalyzed by cytochrome 271
P450 enzymes has been achieved in vivo by genetic modifications of plants and 272
cyanobacteria (Lassen et al 2014a Nielsen et al 2016 Mellor et al 2017) Cytochrome 273
P450s constitute the largest family of plant enzymes that acts on various endogenous and 274
xenobiotic molecules (Rasool and Mohamed 2016) Their extreme versatility and 275
irreversibility of catalyzed reactions make these enzymes very attractive for use in 276
biotechnology medicine and phytoremediation P450s are monooxygenases that insert an 277
oxygen atom into hydrophobic molecules which enhances their reactivity and hydrophilicity 278
Most eukaryotic P450s require NADPHcytochrome P450 reductase as the electron donor 279
The ER membrane is generally accepted to be the primary subcellular repository of 280
eukaryotic P450s and their NADPHcytochrome P450 reductase By relocating cytochrome 281
P450s to the chloroplasts the reducing power of photosynthesis can be directly targeted to 282
the reactions catalyzed by these enzymes thus providing the basis for the large-scale 283
production of valuable products Initial attempts to couple P450s with photosynthesis were 284
conducted in vitro (Table 3 Fig 4A) Spinach chloroplasts were combined with microsomes 285
from yeast cells that had been stably transformed with a fusion gene expressing the rat 286
CYP1A1-NADPHcytochrome P450 reductase fusion enzyme (Kim et al 1996) These 287
experiments confirmed that it is feasible to drive P450-mediated reactions using electrons 288
derived from photosynthetically generated NADPH Intriguingly the NADPHcytochrome 289
P450 reductase is not always essential as demonstrated by co-incubating CYP79A1 from 290
sorghum (Sorghum bicolor) with barley (Hordeum vulgare) PSI and employing ferredoxin to 291
directly deliver electrons from PSI to the P450 (Jensen et al 2011) This approach was also 292
shown to be practicable in vivo CYP79A1 either alone or in combination with CYP71E1 293
and the UDP-glucosyltransferase UGT85B1 was first targeted in vivo to cyanobacterial or 294
plant thylakoid membranes where they catalyzed the same reactions as in their original 295
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13
cellular compartment (the ER) utilizing photosynthetically reduced ferredoxin as the electron 296
donor (Nielsen et al 2013 Lassen et al 2014b Gnanasekaran et al 2016 Wlodarczyk et 297
al 2016) Genetic fusions have also been employed for the coupling of P450s to PSI 298
CYP79A1 has been fused to either cyanobacterial PsaM or Arabidopsis ferredoxin and the 299
engineered enzyme showed light-driven activity both in vivo and in vitro (Lassen et al 300
2014b Mellor et al 2016) In the latter case the efficiency of the system was enhanced 301
because the fusion could compete better with endogenous electron sinks coupled to metabolic 302
pathways (Mellor et al 2016) 303
In contrast to PSI-P450 hybrids PSI-hydrogenase hybrids currently function only in 304
vitro Unlike fossil fuels H2 is environmentally benign as it produces only water when 305
combusted Therefore in principle harnessing of the reducing power of photosynthesis for 306
the direct production of H2 (ie ultimately using sunlight and water) would yield a fully 307
sustainable system of energy generation PSI but not PSII provides a standard midpoint 308
potential that is sufficiently negative to power the reduction of protons to H2 (Utschig et al 309
2015) Hence approaches have been developed to engineer PSI to produce H2 either as 310
replacement or in addition to its natural product NADPH (see Figure 1 in Box 1) by 311
redirecting PSI electrons to a catalytic component This catalytic component can be abiotic or 312
biotic (hydrogenases) The feasibility of coupling H2 generation to photosynthesis was 313
demonstrated 45 years ago by mixing chloroplast preparations with ferredoxin and 314
hydrogenase (Benemann et al 1973) Twenty-five years later hydrogen evolution by direct 315
electron transfer (without ferredoxin) from PSI to hydrogenases was accomplished for the 316
first time (McTavish 1998) 317
Hydrogenases catalyze the reversible interconversion of H2 into protons and electrons 318
and are widespread in nature they occur in bacteria and archaea but also in some eukarya In 319
vivo hydrogenases can mediate photosynthetic H2 production albeit mostly indirectly or 320
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14
under anaerobic conditions due to their oxygen sensitivity (Ghirardi 2015 Oey et al 2016) 321
Hydrogenases can be classified according to their metal-ion composition eg [NiFe] and 322
[FeFe] hydrogenases (Lubitz et al 2014 Martin and Frymier 2017) [FeFe] hydrogenases 323
preferentially catalyze proton reduction and can evolve H2 at high rates but are extremely 324
sensitive to O2 and are the only type of hydrogenases found in eukaryotic microorganisms 325
[NiFe] hydrogenases are less sensitive to O2 but preferentially oxidize H2 under 326
physiological conditions (Lubitz et al 2014) In vitro both types of hydrogenases have been 327
directly linked to PSI (Table 3 Fig 4B) PSI-[NiFe] hydrogenase complexes have been 328
generated by fusing the hydrogenase genetically to the PsaE protein (Ihara et al 2006a) PSI-329
[FeFe] hydrogenase complexes were obtained by genetically fusing the hydrogenase to 330
ferredoxin (Yacoby et al 2011) or covalently linking the FeS clusters present in the 331
hydrogenase to PSI via a molecular wire (Lubner et al 2010 Lubner et al 2011) 332
Two parameters characterize the efficiency of these in-vitro systems their H2 333
production rate and longevity While low rates of H2 production (in the range from 01 to 10 334
μmol H2mg chlorophyllh) were described for the early chloroplast extract experiments and 335
genetic fusions of PSI to [NiFe] or [FeFe] hydrogenases (McTavish 1998 Ihara et al 2006a 336
Yacoby et al 2011) higher rates of between 2000 and 3000 μmol H2mg chlorophyllh have 337
been achieved with wired PSI-[FeFe] hydrogenase complexes and genetically fused PSI-338
[NiFe] hydrogenase complexes assembled on a gold electrode (Krassen et al 2009 Lubner 339
et al 2011) Few data are available with respect to the longevity of the PSI-hydrogenase 340
systems however a minimum lifetime of 64 days was reported for a wired [FeFe] 341
hydrogenase-PSI complex at room temperature and under ambient illumination (Lubner et 342
al 2010) 343
The future use of hydrogenases in photosynthesis-driven H2 production will strongly 344
depend on whether or not it is possible to overcome the O2 sensitivity of many hydrogenases 345
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15
by for instance employing oxygen-tolerant [NiFe] hydrogenases (Burgdorf et al 2005 346
Schiffels et al 2013) If this is not possible their efficient use in vivo in thylakoids which 347
inevitably generate O2 during linear electron flow will be impossible However as 348
demonstrated with the gold surface system (Krassen et al 2009) the design of novel 349
matrices into which the hybrid system can be incorporated may markedly enhance the 350
efficiency 351
352
Bio-nano hybrids Use of photosynthesis as a source of electrons for non-biological 353
processes 354
From bio-bio hybrids it is only a small step to developing bio-nano hybrids as demonstrated 355
by PSI hybrids that employ abiotic catalysts for photosynthetic hydrogen production instead 356
of hydrogenase In fact abiotic catalysts have the advantage of bypassing the lability of 357
hydrogenases in the presence of oxygen PSI-platinum hybrids have been produced by 358
combining PSI with platinum nanoparticles (either directly or via tethering by nanowires) or 359
platinum nanoclusters (Kargul et al 2012 Fukuzumi 2015 Utschig et al 2015) (Fig 5A 360
Table 4) Current PSI-platinum hybrids are less efficient than the most advanced PSI-361
hydrogenase systems but are extremely robust (Utschig et al 2015) However future 362
widespread usage of the PSI-platinum system will be limited by the high cost of platinum A 363
more economical alternative to precious metals are earth-abundant molecular catalysts 364
However hybrids consisting of PSI and earth-abundant molecular catalysts have a much 365
shorter working life than platinum-based configurations (Utschig et al 2015) likely due to 366
instability of the molecular catalyst 367
PSI-based photocurrent-producing devices constitute another class of photosynthesis-368
derived nano-bio systems (Table 4 Fig 5) In such devices PSI is immobilized onto 369
electrodes Many variants of this concept have been tested such as varying the electrode 370
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16
materials immobilizationorientation strategies andor artificial redox mediators (Nguyen and 371
Bruce 2014 Janna Olmos and Kargul 2015 Plumereacute and Nowaczyk 2017 Kargul et al 372
2018) PSI must be immobilized on the electrode surface in such a way that electron transfers 373
between the electrodes and the oxidizing (P700) and reducing (FB - the terminal [4Fe-4S] 374
cluster or an intermediate electron transporter) sites of PSI can proceed with the required 375
efficiency Electrons are transferred between the electrodes and the oxidizing or reducing 376
sides of PSI either by a diffusible redox mediator or molecular wires Examples of electrode 377
materials and redox mediators are provided in Table 4 After P700 photo-excitation electrons 378
are transferred from P700 via several factors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB) to the 379
iron-sulfur cluster FB (see legend of Box 1) As in the case of PSI-hydrogenase and PSI-380
platinum nanoparticles PSI can be wired to its electrodes This has been achieved by wiring 381
the A1 cofactor (phylloquinone) to the substrate surface such that electrons are directly 382
transferred from A1 to the electrode thus bypassing the downstream FeS clusters (FX FA FB) 383
in the stromal domain of PSI (Terasaki et al 2007 Miyachi et al 2009 Terasaki et al 384
2009 Miyachi et al 2010) 385
Modifications of PSI have been utilized to enhance the efficiency of the photocurrent-386
generating system (Das et al 2004 Frolov et al 2005 Carmeli et al 2010) As mentioned 387
previously fusions to the stroma-faced PSI subunit PsaE can be used to link new components 388
to PSI however in this case PsaD fusions were used To this end recombinant His-tagged 389
PsaD was immobilized on the functionalized electrode surface which was then exposed to 390
native PSI complexes resulting in immobilized PSI with P700 facing away from the 391
electrode (Das et al 2004) Another way to control the orientation of PSI during 392
immobilization involves introducing cysteine mutations To allow for direct thiol coupling to 393
an Au surface various residues on the lumen-exposed face of PSI were replaced by cysteine 394
and tested (Frolov et al 2005) PSI attachment was achieved with all single mutants even 395
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17
those placed further from the P700 site suggesting that a specific location is not required as 396
long as the cysteine is exposed at the luminal surface of PSI The concept of targeted 397
attachment via introduced cysteine residues was exploited in subsequent studies to link PSI to 398
maleimide-functionalized gallium arsenide (Frolov et al 2008) to immobilize PSI between 399
the substrate and a metallized scanning near-field optical microscopy tip (Gerster et al 400
2012) and to bind PSI to carbon nanotubes (Kaniber et al 2010) Another modification of 401
PSI is represented by the attachment of plasmonic metal nanoparticles which resulted in 402
enhanced light absorption (Carmeli et al 2010) even in the green part of the solar spectrum 403
that is not normally absorbed (Szalkowski et al 2017) This suggests that it is possible to 404
enhance light absorption by PSI in vitro through the attachment of abiotic components that 405
act as optical antennae to extend the spectrum of photons available for P700 activation 406
Taken together these efforts demonstrate that PSI-based photocurrent-generating 407
systems are still in an exploratory phase with many variants under development In the next 408
phase viable building blocks and reference systems should be established that can serve as 409
starting points for the systematic engineering of superior systems This will require the 410
modification of PSI for optimal effect in artificial systems and will undoubtedly differ 411
substantially from the original environment in which PSI was molded by biological 412
evolution 413
414
Concluding remarks and outlook 415
Enhancing photosynthesis and growth can be achieved by a simple overexpression of certain 416
photosynthetic proteins and PSI can be coupled to previously unconnected biotic or abiotic 417
components to generate valuable compounds hydrogen or electricity Moreover entire 418
photosynthetic complexes can be functionally expressed in distantly related species (as 419
demonstrated for RuBisCO Aigner et al 2017) Thus what are the next goals and which 420
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18
challenges need to be overcome Two challenges for the in vivo systems are obvious (i) 421
enhancing the efficiency of in-vivo bio-bio hybrids and (ii) upscaling the size of ldquosynthetic 422
photosynthetic modulesrdquo to cover entire photosystems or complex antenna systems 423
With respect to the enhancement of in vivo cyanobacterial and algal systems 424
harboring hybrid configurations in which photosynthesis directly drives previously 425
unconnected pathways the use of laboratory evolution offers a unique opportunity to tailor 426
these systems for their intended purpose Laboratory evolution utilizes the high rate of 427
evolution typical in microbial systems (in particular if suitable selection conditions can be 428
designed) to fine tune and optimize processes through selection of advantageous genetic 429
variation While this strategy has been employed in E coli and yeast with impressive success 430
now photosynthetic microbial systems are emerging as attractive targets for this approach 431
(Leister 2017) 432
The exchange of entire multiprotein complexes between distantly related species will 433
not be a simple exercise because the ldquofrozen metabolic staterdquo of the core photosynthetic 434
complexes will necessitate the exchange of major parts of photosystems rather than 435
individual subunits The RuBisCO case study by Aigner et al (2017) represents of promising 436
proof of principle but one needs to consider that the synthetic RuBisCO module comprised 437
only the two different subunits present in the mature complex and five auxiliary factors for its 438
assembly Entire photosystems will require much larger ldquosynthetic photosynthetic modulesrdquo 439
and many of the auxiliary factors have not been identified yet Therefore when designing 440
these complex ldquosynthetic photosynthetic modulesrdquo we will identify the set of components 441
that are sufficient (and not only necessary) to drive photosynthesis providing an 442
unprecedentedly deep understanding of this fundamental and complex process 443
Given that the problems described above can be solved what will be the next steps in 444
the synthetic biology of the light reactions of photosynthesis The combination of ldquosynthetic 445
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19
photosynthetic modulesrdquo from diverse species could allow the design of novel variants of 446
photosynthesis Numerous instances of such ldquorecombined photosynthetic variantsrdquo can be 447
imagined including plants that employ cyanobacteria-derived phycobilisomes for highly 448
sufficient photosynthesis under low light conditions cyanobacteria that employ plant-derived 449
LHCs as antenna to shift light saturation of photosynthesis to higher intensities or the 450
integration of cyanobacterial Chl d and Chl f (which can absorb far-red and near infra-red 451
light) into algal or plant photosynthesis to expand the spectral region available to drive 452
photosynthesis (Loughlin et al 2013 Ho et al 2016) Moreover such variants of 453
recombined photosynthesis could be further optimized by laboratory evolution within a 454
suitable microbial chassis However such recombined photosynthetic variants cannot be 455
considered a truly novel type of photosynthesis because they would only bring preexisting 456
pieces together that evolution has separated Nevertheless they could be an important step 457
towards the ambitious goal to design truly novel ldquosynthetic photosynthetic modulesrdquo that 458
contain more efficient substitutes of the ldquofrozen metabolic accidentsrdquo discussed above 459
Ample proof of functionality for in-vivo hybrids (between photosynthesis and 460
previously unconnected metabolic pathways) and in-vitro hybrids (between PSI and biotic or 461
abiotic catalysts) has been obtained but such systems will only be commercially successful if 462
they can compete with established non-biological systems Tailoring of PSI in cyanobacteria 463
where techniques like gene replacement and gene modification are routine may contribute to 464
further improving the efficiency and robustness of in vitro and in vivo hybrids One 465
promising route could be to identify those parts of the original PSI (which evolved under 466
constraints imposed by the cyanobacterial cell) that are necessary for hybrid devices (a 467
ldquominimalrdquo PSI) Such bio-nano systems can be optimized to include novel non-biological 468
components that replace or complement natural pigments andor the protein-based backbone 469
of photosystems going far beyond the limited toolbox of Naturersquos chemistry Such novel 470
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20
systems inspired by natural photosynthesis could be used to engage biologists in the design 471
of fundamentally different types of photosynthesis in living organisms 472
473
SUPPLEMENTAL DATA 474
Supplemental Table 1 Absencepresence of photosynthetic proteins in the three model 475
species Synechocystis PCC6803 (Syn) Chlamydomonas reinhardtii (Cr) and Arabidopsis 476
thaliana (At) 477
478
ACKNOWLEDGMENTS 479
The authors thank Paul Hardy for critical reading of the manuscript 480
481
482
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21
Table 1 Replacement of conserved individual or multiple photosynthetic proteins 483
GeneProtein Description Protein
identity
Reference
psbAD1 Synechocystis D1 was replaced by its homolog from
Poa annua which resulted in slower growth This is
likely to be due to increased charge recombination
between the donor and acceptor sides of the reaction
center
86 Nixon et al
1991
psbBCP47 Synechocystis CP47 was replaced by its homolog
from spinach and photoautotrophy was lost
80 Vermaas et
al 1996
psbCCP43 Synechocystis CP43 was replaced by its homolog
from spinach and photoautotrophy was lost
85 Carpenter et
al 1993
psbHPsbH Synechocystis PsbH was replaced by its counterpart
from maize The resulting strain displayed increased
light sensitivity and lower chlorophyll content
78 Chiaramonte
et al 1999
psaAPsaA Synechocystis PsaA was replaced by its equivalent
from A thaliana This resulted in reduced photo-
autotrophical growth and a drastically reduced
ChlPC ratio
80 Viola et al
2014
psbABCDEF
D1CP47CP43D2
Cyt b559-+
All six core subunits of C reinhardtii were replaced
by their counterparts from two different green algae
(V carteri and S obliquus) The resulting strains
were photoautotrophic but showed reduced
photosynthetic efficiency and the heterologous
82 -
99
Gimpel et al
2016
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22
proteins reached only between 10 and 20 of the
levels of those they replaced
484
485
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23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
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24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
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25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
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26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
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28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
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31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
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32
References 565
566
Aigner H Wilson RH Bracher A Calisse L Bhat JY Hartl FU Hayer-Hartl M (2017) 567
Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
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ACS Nano 3 4055-4061 679
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Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
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Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
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Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
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Plant Sci 3 199 694
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enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
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Photosynth Res 116 277-293 705
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Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
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enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
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37
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photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
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biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
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understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
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Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
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Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
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236-248 762
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38
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24340-24354 767
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Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
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Biol 8 e1000288 772
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
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2189 785
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134-145 788
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Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
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40
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843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
8
particular phycobilisomes flavodoxin and several photosystem subunits were lost while 174
LHCs some novel photosystem subunits and several proteins involved in alternative electron 175
pathways or photoprotection evolved During the transition from algal chloroplasts to those 176
of flowering plants relatively few proteins were lost (eg flavodiiron proteins and the 177
canonical cytochrome c6) or acquired (Lhcb6CP24) (Fig 3 Supplemental Table 1) The 178
NAD(P)H dehydrogenase (NDH) complex involved in antimycin A-insensitive cyclic 179
electron flow (see Box 1) is a special case since the chloroplast NDH from flowering plants 180
traces back to the cyanobacterial complex but the complex was lost during evolution in C 181
reinhardtii (Fig 3 Supplemental Table 1) 182
Several attempts have been made to introduce photosynthetic proteins into species 183
that lack the corresponding homolog (Table 2) These heterologous expression approaches 184
have been successful for the soluble electron transporters flavodoxin cytochrome c6 and 185
flavodiiron proteins Indeed cyanobacterial flavodoxin can at least partially replace plant 186
ferredoxin and confer enhanced stress tolerance when expressed in addition to ferredoxin 187
(Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011) Similarly red algal 188
cytochrome c6 enhances growth and photosynthesis of A thaliana plants (Chida et al 2007) 189
Since A thaliana lacks a functional cytochrome c6 that can transfer electrons from the Cyt b6f 190
complex to PSI (Molina-Heredia et al 2003 Weigel et al 2003) it is plausible that the 191
more oxidized plastoquinone pool in the transgenic plants is a direct consequence of 192
additional PSI reduction mediated by the algal protein (Chida et al 2007) Interestingly it 193
seems to make no difference if an endogenous soluble electron transport protein (see Box 3) 194
or its heterologous equivalent from a distant species is overexpressed For instance 195
overexpression of the endogenous soluble proteins plastocyanin and ferredoxin can also 196
enhance growth in plants (Pesaresi et al 2009 Lin et al 2013 Chang et al 2017 Zhou et 197
al 2018) Interestingly and rather unexpectedly this concept can also work for certain 198
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
9
proteins that are part of multiprotein complexes (Simkin et al 2017 see Box 3) This 199
indicates that the quantity of such proteins is relevant for growth enhancement and not its 200
evolutionary origin 201
More recently the two Physcomitrella patens flavodiiron protein (FLV) genes FlvA 202
and FlvB were introduced into A thaliana which like other angiosperms has lost FLVs 203
during evolution (Yamamoto et al 2016) FLVs are the main mediators of pseudo-cyclic 204
electron flow in photosynthetic organisms but heterologous expression of FLVs in A 205
thaliana had no effect on steady-state photosynthesis and growth of the transgenic plants 206
(Yamamoto et al 2016) However the Arabidopsis FLV lines displayed higher 207
photosynthetic yields just after the onset of actinic light following a long dark adaptation 208
suggesting that the FLVs mediated a large electron sink during the induction of 209
photosynthesis In fluctuating light experiments the Arabidopsis FLV lines had much less 210
PSI acceptor side limitation implying that the large FLV-mediated electron sink makes 211
photosynthesis more resistant to the fluctuating light Consequently this protective effect of 212
FLVs is more pronounced in Arabidopsis lines that are more sensitive to fluctuating light like 213
the pgr5 mutant defective in antimycin A-sensitive cyclic electron flow (see Box 1 Leister 214
and Shikanai 2013 Yamamoto et al 2016) Similarly expression of FLVs in a rice (Oryza 215
sativa) line with markedly reduced cyclic electron flow restored CO2 assimilation and growth 216
rate to wild-type levels (Wada et al 2018) Like FLVs LHcxLHCSR proteins play a role in 217
photoprotection in green algae and mosses but have been lost in angiosperms during 218
evolution Heterologous expression of P patens LHCSR1 in Nicotiana benthamiana and 219
Nicotiana tabacum yielded an active protein that has properties similar if not identical to 220
those of moss LHCSR1 (Pinnola et al 2015) 221
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10
Efforts to create LHCII complexes like those in plants by heterologously expressing 222
the membrane-spanning light-harvesting chlorophyll ab-binding protein Lhcb from Pisum 223
sp (pea) in Synechocystis were unsuccessful 224
Although the pea Lhcb protein was synthesized in Synechocystis and integrated into 225
the membrane it did not accumulate to steady-state levels detectable by immunoblot analysis 226
(He et al 1999) Possible explanations are that Lhcb is rapidly degraded either because its 227
ldquounfamiliarrdquo structure makes it a good substrate for the cyanobacterial proteolytic system or 228
it cannot foldassemble properly due to the lack of plant-specific pigments or assembly 229
factors Interestingly chlorophyll b production (see Box 2) after introduction of plant 230
chlorophyll a oxygenase (CAO) is boosted when Lhcb is expressed even though LHCII does 231
not accumulate in detectable amounts (Xu et al 2001) 232
Even soluble multiprotein complexes can be heterologously expressed as has been 233
impressively demonstrated from the carbon-fixation end of photosynthesis For example by 234
coexpression of five auxiliary factors a functional plant RuBisCo complex was successfully 235
assembled in Escherichia coli (Aigner et al 2017) This result is in line with the ldquofrozen 236
metabolic staterdquo concept showing that photosynthetic proteins embedded in a network of 237
interactions with other proteins and auxiliary factors can be introduced into distantly related 238
species but only with their own interaction networks While Gimpel et al (2016) showed that 239
efficient gene expression needs to be accounted for when designing synthetic modules for the 240
transfer of photosystem subunits from one species to another Aigner et al (2017) 241
demonstrated that auxiliary factors required for the biogenesis of photosynthetic 242
(sub)complexes need to be considered in such experiments adding additional facets to the 243
ldquofrozen metabolic staterdquo concept 244
Auxiliary factors required for the accumulation of photosynthetic multiprotein 245
complexes include (i) cofactors like iron-sulfur clusters and pigments (see Box 2) (ii) 246
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11
chaperones that are required for the insertion of co-factors (eg pigments into LHCs Schmid 247
2008) and (iii) assembly factors Assembly factors are required to support the stepwise 248
assembly and functionality of the multiproteinpigment complexes and many of these are 249
conserved between photosynthetic species (Nixon et al 2010 Nickelsen and Rengstl 2013 250
Jensen and Leister 2014) Therefore the exchange of entire multiprotein complexes between 251
distantly related species will not be simple due to the repertoire of auxiliary factors that has 252
markedly changed during evolution Since the species that Gimpel et al (2016) studied were 253
closely related this aspect could be neglected In consequence the impact of these auxiliary 254
factors on the formation of multiproteinpigment complexes will have to be fully elucidated 255
to understand which factors are sufficient to assemble a photosynthetic multiprotein complex 256
previous (genetic) approaches only identified factors required for this process Hence the 257
transfer of entire photosynthetic (sub)complexes between distantly related species by a 258
ldquosynthetic photosynthetic modulerdquo must include entire sets of strongly interacting proteins (to 259
address the ldquofrozen metabolic staterdquo) as well as all genetic elements and auxiliary factors 260
sufficient for efficient expression biogenesis and function of the proteins in the module 261
262
Bio-bio hybrids using photosynthesis as an electron source for unrelated biological 263
processes 264
The idea of using the reducing power of photosynthesis to drive unrelated metabolic reactions 265
has inspired several biotechnological concepts The photosynthesis-driven formation of 266
secondary metabolites has been demonstrated in vivo whereas light-driven generation of H2 267
by bio-bio hybrids so far works only in vitro and is closely related to bio-nano approaches 268
Therefore coupling of photosynthesis to previously unrelated pathways is discussed here 269
first followed by bio-bio systems for H2 generation 270
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12
Redirection of PSI reducing equivalents to drive reactions catalyzed by cytochrome 271
P450 enzymes has been achieved in vivo by genetic modifications of plants and 272
cyanobacteria (Lassen et al 2014a Nielsen et al 2016 Mellor et al 2017) Cytochrome 273
P450s constitute the largest family of plant enzymes that acts on various endogenous and 274
xenobiotic molecules (Rasool and Mohamed 2016) Their extreme versatility and 275
irreversibility of catalyzed reactions make these enzymes very attractive for use in 276
biotechnology medicine and phytoremediation P450s are monooxygenases that insert an 277
oxygen atom into hydrophobic molecules which enhances their reactivity and hydrophilicity 278
Most eukaryotic P450s require NADPHcytochrome P450 reductase as the electron donor 279
The ER membrane is generally accepted to be the primary subcellular repository of 280
eukaryotic P450s and their NADPHcytochrome P450 reductase By relocating cytochrome 281
P450s to the chloroplasts the reducing power of photosynthesis can be directly targeted to 282
the reactions catalyzed by these enzymes thus providing the basis for the large-scale 283
production of valuable products Initial attempts to couple P450s with photosynthesis were 284
conducted in vitro (Table 3 Fig 4A) Spinach chloroplasts were combined with microsomes 285
from yeast cells that had been stably transformed with a fusion gene expressing the rat 286
CYP1A1-NADPHcytochrome P450 reductase fusion enzyme (Kim et al 1996) These 287
experiments confirmed that it is feasible to drive P450-mediated reactions using electrons 288
derived from photosynthetically generated NADPH Intriguingly the NADPHcytochrome 289
P450 reductase is not always essential as demonstrated by co-incubating CYP79A1 from 290
sorghum (Sorghum bicolor) with barley (Hordeum vulgare) PSI and employing ferredoxin to 291
directly deliver electrons from PSI to the P450 (Jensen et al 2011) This approach was also 292
shown to be practicable in vivo CYP79A1 either alone or in combination with CYP71E1 293
and the UDP-glucosyltransferase UGT85B1 was first targeted in vivo to cyanobacterial or 294
plant thylakoid membranes where they catalyzed the same reactions as in their original 295
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13
cellular compartment (the ER) utilizing photosynthetically reduced ferredoxin as the electron 296
donor (Nielsen et al 2013 Lassen et al 2014b Gnanasekaran et al 2016 Wlodarczyk et 297
al 2016) Genetic fusions have also been employed for the coupling of P450s to PSI 298
CYP79A1 has been fused to either cyanobacterial PsaM or Arabidopsis ferredoxin and the 299
engineered enzyme showed light-driven activity both in vivo and in vitro (Lassen et al 300
2014b Mellor et al 2016) In the latter case the efficiency of the system was enhanced 301
because the fusion could compete better with endogenous electron sinks coupled to metabolic 302
pathways (Mellor et al 2016) 303
In contrast to PSI-P450 hybrids PSI-hydrogenase hybrids currently function only in 304
vitro Unlike fossil fuels H2 is environmentally benign as it produces only water when 305
combusted Therefore in principle harnessing of the reducing power of photosynthesis for 306
the direct production of H2 (ie ultimately using sunlight and water) would yield a fully 307
sustainable system of energy generation PSI but not PSII provides a standard midpoint 308
potential that is sufficiently negative to power the reduction of protons to H2 (Utschig et al 309
2015) Hence approaches have been developed to engineer PSI to produce H2 either as 310
replacement or in addition to its natural product NADPH (see Figure 1 in Box 1) by 311
redirecting PSI electrons to a catalytic component This catalytic component can be abiotic or 312
biotic (hydrogenases) The feasibility of coupling H2 generation to photosynthesis was 313
demonstrated 45 years ago by mixing chloroplast preparations with ferredoxin and 314
hydrogenase (Benemann et al 1973) Twenty-five years later hydrogen evolution by direct 315
electron transfer (without ferredoxin) from PSI to hydrogenases was accomplished for the 316
first time (McTavish 1998) 317
Hydrogenases catalyze the reversible interconversion of H2 into protons and electrons 318
and are widespread in nature they occur in bacteria and archaea but also in some eukarya In 319
vivo hydrogenases can mediate photosynthetic H2 production albeit mostly indirectly or 320
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14
under anaerobic conditions due to their oxygen sensitivity (Ghirardi 2015 Oey et al 2016) 321
Hydrogenases can be classified according to their metal-ion composition eg [NiFe] and 322
[FeFe] hydrogenases (Lubitz et al 2014 Martin and Frymier 2017) [FeFe] hydrogenases 323
preferentially catalyze proton reduction and can evolve H2 at high rates but are extremely 324
sensitive to O2 and are the only type of hydrogenases found in eukaryotic microorganisms 325
[NiFe] hydrogenases are less sensitive to O2 but preferentially oxidize H2 under 326
physiological conditions (Lubitz et al 2014) In vitro both types of hydrogenases have been 327
directly linked to PSI (Table 3 Fig 4B) PSI-[NiFe] hydrogenase complexes have been 328
generated by fusing the hydrogenase genetically to the PsaE protein (Ihara et al 2006a) PSI-329
[FeFe] hydrogenase complexes were obtained by genetically fusing the hydrogenase to 330
ferredoxin (Yacoby et al 2011) or covalently linking the FeS clusters present in the 331
hydrogenase to PSI via a molecular wire (Lubner et al 2010 Lubner et al 2011) 332
Two parameters characterize the efficiency of these in-vitro systems their H2 333
production rate and longevity While low rates of H2 production (in the range from 01 to 10 334
μmol H2mg chlorophyllh) were described for the early chloroplast extract experiments and 335
genetic fusions of PSI to [NiFe] or [FeFe] hydrogenases (McTavish 1998 Ihara et al 2006a 336
Yacoby et al 2011) higher rates of between 2000 and 3000 μmol H2mg chlorophyllh have 337
been achieved with wired PSI-[FeFe] hydrogenase complexes and genetically fused PSI-338
[NiFe] hydrogenase complexes assembled on a gold electrode (Krassen et al 2009 Lubner 339
et al 2011) Few data are available with respect to the longevity of the PSI-hydrogenase 340
systems however a minimum lifetime of 64 days was reported for a wired [FeFe] 341
hydrogenase-PSI complex at room temperature and under ambient illumination (Lubner et 342
al 2010) 343
The future use of hydrogenases in photosynthesis-driven H2 production will strongly 344
depend on whether or not it is possible to overcome the O2 sensitivity of many hydrogenases 345
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15
by for instance employing oxygen-tolerant [NiFe] hydrogenases (Burgdorf et al 2005 346
Schiffels et al 2013) If this is not possible their efficient use in vivo in thylakoids which 347
inevitably generate O2 during linear electron flow will be impossible However as 348
demonstrated with the gold surface system (Krassen et al 2009) the design of novel 349
matrices into which the hybrid system can be incorporated may markedly enhance the 350
efficiency 351
352
Bio-nano hybrids Use of photosynthesis as a source of electrons for non-biological 353
processes 354
From bio-bio hybrids it is only a small step to developing bio-nano hybrids as demonstrated 355
by PSI hybrids that employ abiotic catalysts for photosynthetic hydrogen production instead 356
of hydrogenase In fact abiotic catalysts have the advantage of bypassing the lability of 357
hydrogenases in the presence of oxygen PSI-platinum hybrids have been produced by 358
combining PSI with platinum nanoparticles (either directly or via tethering by nanowires) or 359
platinum nanoclusters (Kargul et al 2012 Fukuzumi 2015 Utschig et al 2015) (Fig 5A 360
Table 4) Current PSI-platinum hybrids are less efficient than the most advanced PSI-361
hydrogenase systems but are extremely robust (Utschig et al 2015) However future 362
widespread usage of the PSI-platinum system will be limited by the high cost of platinum A 363
more economical alternative to precious metals are earth-abundant molecular catalysts 364
However hybrids consisting of PSI and earth-abundant molecular catalysts have a much 365
shorter working life than platinum-based configurations (Utschig et al 2015) likely due to 366
instability of the molecular catalyst 367
PSI-based photocurrent-producing devices constitute another class of photosynthesis-368
derived nano-bio systems (Table 4 Fig 5) In such devices PSI is immobilized onto 369
electrodes Many variants of this concept have been tested such as varying the electrode 370
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16
materials immobilizationorientation strategies andor artificial redox mediators (Nguyen and 371
Bruce 2014 Janna Olmos and Kargul 2015 Plumereacute and Nowaczyk 2017 Kargul et al 372
2018) PSI must be immobilized on the electrode surface in such a way that electron transfers 373
between the electrodes and the oxidizing (P700) and reducing (FB - the terminal [4Fe-4S] 374
cluster or an intermediate electron transporter) sites of PSI can proceed with the required 375
efficiency Electrons are transferred between the electrodes and the oxidizing or reducing 376
sides of PSI either by a diffusible redox mediator or molecular wires Examples of electrode 377
materials and redox mediators are provided in Table 4 After P700 photo-excitation electrons 378
are transferred from P700 via several factors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB) to the 379
iron-sulfur cluster FB (see legend of Box 1) As in the case of PSI-hydrogenase and PSI-380
platinum nanoparticles PSI can be wired to its electrodes This has been achieved by wiring 381
the A1 cofactor (phylloquinone) to the substrate surface such that electrons are directly 382
transferred from A1 to the electrode thus bypassing the downstream FeS clusters (FX FA FB) 383
in the stromal domain of PSI (Terasaki et al 2007 Miyachi et al 2009 Terasaki et al 384
2009 Miyachi et al 2010) 385
Modifications of PSI have been utilized to enhance the efficiency of the photocurrent-386
generating system (Das et al 2004 Frolov et al 2005 Carmeli et al 2010) As mentioned 387
previously fusions to the stroma-faced PSI subunit PsaE can be used to link new components 388
to PSI however in this case PsaD fusions were used To this end recombinant His-tagged 389
PsaD was immobilized on the functionalized electrode surface which was then exposed to 390
native PSI complexes resulting in immobilized PSI with P700 facing away from the 391
electrode (Das et al 2004) Another way to control the orientation of PSI during 392
immobilization involves introducing cysteine mutations To allow for direct thiol coupling to 393
an Au surface various residues on the lumen-exposed face of PSI were replaced by cysteine 394
and tested (Frolov et al 2005) PSI attachment was achieved with all single mutants even 395
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17
those placed further from the P700 site suggesting that a specific location is not required as 396
long as the cysteine is exposed at the luminal surface of PSI The concept of targeted 397
attachment via introduced cysteine residues was exploited in subsequent studies to link PSI to 398
maleimide-functionalized gallium arsenide (Frolov et al 2008) to immobilize PSI between 399
the substrate and a metallized scanning near-field optical microscopy tip (Gerster et al 400
2012) and to bind PSI to carbon nanotubes (Kaniber et al 2010) Another modification of 401
PSI is represented by the attachment of plasmonic metal nanoparticles which resulted in 402
enhanced light absorption (Carmeli et al 2010) even in the green part of the solar spectrum 403
that is not normally absorbed (Szalkowski et al 2017) This suggests that it is possible to 404
enhance light absorption by PSI in vitro through the attachment of abiotic components that 405
act as optical antennae to extend the spectrum of photons available for P700 activation 406
Taken together these efforts demonstrate that PSI-based photocurrent-generating 407
systems are still in an exploratory phase with many variants under development In the next 408
phase viable building blocks and reference systems should be established that can serve as 409
starting points for the systematic engineering of superior systems This will require the 410
modification of PSI for optimal effect in artificial systems and will undoubtedly differ 411
substantially from the original environment in which PSI was molded by biological 412
evolution 413
414
Concluding remarks and outlook 415
Enhancing photosynthesis and growth can be achieved by a simple overexpression of certain 416
photosynthetic proteins and PSI can be coupled to previously unconnected biotic or abiotic 417
components to generate valuable compounds hydrogen or electricity Moreover entire 418
photosynthetic complexes can be functionally expressed in distantly related species (as 419
demonstrated for RuBisCO Aigner et al 2017) Thus what are the next goals and which 420
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18
challenges need to be overcome Two challenges for the in vivo systems are obvious (i) 421
enhancing the efficiency of in-vivo bio-bio hybrids and (ii) upscaling the size of ldquosynthetic 422
photosynthetic modulesrdquo to cover entire photosystems or complex antenna systems 423
With respect to the enhancement of in vivo cyanobacterial and algal systems 424
harboring hybrid configurations in which photosynthesis directly drives previously 425
unconnected pathways the use of laboratory evolution offers a unique opportunity to tailor 426
these systems for their intended purpose Laboratory evolution utilizes the high rate of 427
evolution typical in microbial systems (in particular if suitable selection conditions can be 428
designed) to fine tune and optimize processes through selection of advantageous genetic 429
variation While this strategy has been employed in E coli and yeast with impressive success 430
now photosynthetic microbial systems are emerging as attractive targets for this approach 431
(Leister 2017) 432
The exchange of entire multiprotein complexes between distantly related species will 433
not be a simple exercise because the ldquofrozen metabolic staterdquo of the core photosynthetic 434
complexes will necessitate the exchange of major parts of photosystems rather than 435
individual subunits The RuBisCO case study by Aigner et al (2017) represents of promising 436
proof of principle but one needs to consider that the synthetic RuBisCO module comprised 437
only the two different subunits present in the mature complex and five auxiliary factors for its 438
assembly Entire photosystems will require much larger ldquosynthetic photosynthetic modulesrdquo 439
and many of the auxiliary factors have not been identified yet Therefore when designing 440
these complex ldquosynthetic photosynthetic modulesrdquo we will identify the set of components 441
that are sufficient (and not only necessary) to drive photosynthesis providing an 442
unprecedentedly deep understanding of this fundamental and complex process 443
Given that the problems described above can be solved what will be the next steps in 444
the synthetic biology of the light reactions of photosynthesis The combination of ldquosynthetic 445
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19
photosynthetic modulesrdquo from diverse species could allow the design of novel variants of 446
photosynthesis Numerous instances of such ldquorecombined photosynthetic variantsrdquo can be 447
imagined including plants that employ cyanobacteria-derived phycobilisomes for highly 448
sufficient photosynthesis under low light conditions cyanobacteria that employ plant-derived 449
LHCs as antenna to shift light saturation of photosynthesis to higher intensities or the 450
integration of cyanobacterial Chl d and Chl f (which can absorb far-red and near infra-red 451
light) into algal or plant photosynthesis to expand the spectral region available to drive 452
photosynthesis (Loughlin et al 2013 Ho et al 2016) Moreover such variants of 453
recombined photosynthesis could be further optimized by laboratory evolution within a 454
suitable microbial chassis However such recombined photosynthetic variants cannot be 455
considered a truly novel type of photosynthesis because they would only bring preexisting 456
pieces together that evolution has separated Nevertheless they could be an important step 457
towards the ambitious goal to design truly novel ldquosynthetic photosynthetic modulesrdquo that 458
contain more efficient substitutes of the ldquofrozen metabolic accidentsrdquo discussed above 459
Ample proof of functionality for in-vivo hybrids (between photosynthesis and 460
previously unconnected metabolic pathways) and in-vitro hybrids (between PSI and biotic or 461
abiotic catalysts) has been obtained but such systems will only be commercially successful if 462
they can compete with established non-biological systems Tailoring of PSI in cyanobacteria 463
where techniques like gene replacement and gene modification are routine may contribute to 464
further improving the efficiency and robustness of in vitro and in vivo hybrids One 465
promising route could be to identify those parts of the original PSI (which evolved under 466
constraints imposed by the cyanobacterial cell) that are necessary for hybrid devices (a 467
ldquominimalrdquo PSI) Such bio-nano systems can be optimized to include novel non-biological 468
components that replace or complement natural pigments andor the protein-based backbone 469
of photosystems going far beyond the limited toolbox of Naturersquos chemistry Such novel 470
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20
systems inspired by natural photosynthesis could be used to engage biologists in the design 471
of fundamentally different types of photosynthesis in living organisms 472
473
SUPPLEMENTAL DATA 474
Supplemental Table 1 Absencepresence of photosynthetic proteins in the three model 475
species Synechocystis PCC6803 (Syn) Chlamydomonas reinhardtii (Cr) and Arabidopsis 476
thaliana (At) 477
478
ACKNOWLEDGMENTS 479
The authors thank Paul Hardy for critical reading of the manuscript 480
481
482
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21
Table 1 Replacement of conserved individual or multiple photosynthetic proteins 483
GeneProtein Description Protein
identity
Reference
psbAD1 Synechocystis D1 was replaced by its homolog from
Poa annua which resulted in slower growth This is
likely to be due to increased charge recombination
between the donor and acceptor sides of the reaction
center
86 Nixon et al
1991
psbBCP47 Synechocystis CP47 was replaced by its homolog
from spinach and photoautotrophy was lost
80 Vermaas et
al 1996
psbCCP43 Synechocystis CP43 was replaced by its homolog
from spinach and photoautotrophy was lost
85 Carpenter et
al 1993
psbHPsbH Synechocystis PsbH was replaced by its counterpart
from maize The resulting strain displayed increased
light sensitivity and lower chlorophyll content
78 Chiaramonte
et al 1999
psaAPsaA Synechocystis PsaA was replaced by its equivalent
from A thaliana This resulted in reduced photo-
autotrophical growth and a drastically reduced
ChlPC ratio
80 Viola et al
2014
psbABCDEF
D1CP47CP43D2
Cyt b559-+
All six core subunits of C reinhardtii were replaced
by their counterparts from two different green algae
(V carteri and S obliquus) The resulting strains
were photoautotrophic but showed reduced
photosynthetic efficiency and the heterologous
82 -
99
Gimpel et al
2016
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22
proteins reached only between 10 and 20 of the
levels of those they replaced
484
485
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23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
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24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
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25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
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26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
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28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
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32
References 565
566
Aigner H Wilson RH Bracher A Calisse L Bhat JY Hartl FU Hayer-Hartl M (2017) 567
Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
chloroplast-ferredoxin-hydrogenase system Proc Natl Acad Sci U S A 70 2317-2320 571
Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
complements ferredoxin deficiency in knocked-down transgenic tobacco plants Plant 574
J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
photosynthesis for energy production Curr Opin Chem Biol 17 457-461 577
Burgdorf T Lenz O Buhrke T van der Linden E Jones AK Albracht SP Friedrich B 578
(2005) [NiFe]-hydrogenases of Ralstonia eutropha H16 modular enzymes for 579
oxygen-tolerant biological hydrogen oxidation J Mol Microbiol Biotechnol 10 181-580
96 581
Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
(2010) Broad band enhancement of light absorption in photosystem I by metal 583
nanoparticle antennas Nano Lett 10 2069-2074 584
Carpenter SD Ohad I Vermaas WF (1993) Analysis of chimeric spinachcyanobacterial 585
CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
the water-splitting system of Photosystem II Biochim Biophys Acta 1144 204-212 587
Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
Eur J Biochem 260 833-843 593
Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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33
Ciornii D Riedel M Stieger KR Feifel SC Hejazi M Lokstein H Zouni A Lisdat F 598
(2017) Bioelectronic Circuit on a 3D Electrode Architecture Enzymatic Catalysis 599
Interconnected with Photosystem I J Am Chem Soc 139 16478-16481 600
Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel 601
genetic diversity Philos Trans R Soc Lond B Biol Sci 372 602
Das R Kiley PJ Segal M Norville J Yu AA Wang L Trammell SA Reddick LE 603
Kumar R Stellacci F Lebedev N Schnur J Bruce BD Zhang S Baldo M (2004) 604
Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
by thermal dissipation of excess energy Biochem Soc Trans 38 651-660 608
Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
device by direct chemical binding of the photosynthetic reaction center protein to 610
metal surfaces Advanced Materials 17 2434-2437 611
Frolov L Rosenwaks Y Richter S Carmeli C Carmeli I (2008) Photoelectric junctions 612
between GaAs and photosynthetic reaction center protein J Phys Chem C 112 613
13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I 617
Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
reinhardtii ACS Synth Biol 5 589-596 624
Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
state biophotovoltaic cells containing photosystem I Adv Mater 26 4863-4869 630
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Glowacka K Kromdijk J Kucera K Xie J Cavanagh AP Leonelli L Leakey ADB Ort 631
DR Niyogi KK Long SP (2018) Photosystem II subunit S overexpression increases 632
the efficiency of water use in a field-grown crop Nat Commun 9 868 633
Gnanasekaran T Karcher D Nielsen AZ Martens HJ Ruf S Kroop X Olsen CE 634
Motawie MS Pribil M Moller BL Bock R Jensen PE (2016) Transfer of the 635
cytochrome P450-dependent dhurrin pathway from Sorghum bicolor into Nicotiana 636
tabacum chloroplasts for light-driven synthesis J Exp Bot 67 2495-2506 637
Haniewicz P Abram M Nosek L Kirkpatrick J El-Mohsnawy E Olmos JDJ Kouřil 638
R Kargul JM (2018) Molecular mechanisms of photoadaptation of photosystem I 639
supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
harvesting chlorophyll ab-binding protein in Synechocystis sp PCC 6803 Eur J 643
Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
synthase is a highly divergent paralog of PsbA of photosystem II Science 353 646
Holt NE Fleming GR Niyogi KK (2004) Toward an understanding of the mechanism of 647
nonphotochemical quenching in green plants Biochemistry 43 8281-8289 648
Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
D Kamachi T Okura I (2006a) Light-driven hydrogen production by a hybrid 650
complex of a [NiFe]-hydrogenase and the cyanobacterial photosystem I Photochem 651
Photobiol 82 676-682 652
Ihara M Nakamoto H Kamachi T Okura I Maeda M (2006b) Photoinduced hydrogen 653
production by direct electron transfer from photosystem I cross-linked with 654
cytochrome c3 to [NiFe]-hydrogenase Photochem Photobiol 82 1677-1685Janna 655
Olmos JD Kargul J (2015) A quest for the artificial leaf Int J Biochem Cell Biol 656
66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
Pawlak D Kargul J (2017) Biofunctionalisation of p-doped silicon with cytochrome 659
c553 minimises charge recombination and enhances photovoltaic performance of the 660
all-solid-state photosystem I-based biophotoelectrode RSC Adv 7 47854-47866 661
Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations 662
ACS Chem Biol 6 533-539 663
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35
Jensen PE Leister D (2014) Chloroplast evolution structure and functions F1000Prime 664
Rep 6 40 665
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip 666
functionalization of carbon nanotubes with photosystem I J Am Chem Soc 132 667
2872-2873 668
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and 669
its application in biomimetic solar-to-fuel systems J Plant Physiol 169 1639-1653 670
Kargul J Bubak G Andryianau G (2018) Biophotovoltaic systems based on 671
photosynthetic complexes In Wandelt K (Ed) Encyclopedia of Interfacial 672
Chemistry Surface Science and Electrochemistry vol 7 pp 43-63 673
Kim YS Hara M Ikebukuro K Miyake J Ohkawa H Karube I (1996) Photo-induced 674
activation of cytochrome P450reductase fusion enzyme coupled with spinach 675
chloroplasts Biotechnol Tech 10 717minus720 676
Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic 677
hydrogen production by a hybrid complex of photosystem I and [NiFe]-hydrogenase 678
ACS Nano 3 4055-4061 679
Kromdijk J Glowacka K Leonelli L Gabilly ST Iwai M Niyogi KK Long SP (2016) 680
Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
Kubota H Sakurai I Katayama K Mizusawa N Ohashi S Kobayashi M Zhang P Aro 683
EM Wada H (2010) Purification and characterization of photosystem I complex 684
from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim 685
Biophys Acta 1797 98-105 686
Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future 702
by engineering crop photosynthesis and yield potential Cell 161 56-66 703
Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
(2011) Solar hydrogen-producing bionanodevice outperforms natural photosynthesis 709
Proc Natl Acad Sci U S A 108 20988-20991 710
Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
production Biochemistry 49 10264-10266 713
Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
organisms using whole-cell and cell-free systems Appl Biochem Biotechnol 183 715
503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
hydrogenases J Biochem 123 644-649 718
Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
(2016) Fusion of ferredoxin and cytochrome P450 enables direct light-driven 720
biosynthesis ACS Chem Biol 11 1862-1869 721
Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous 722
enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
Y Nishihara H (2010) A photosensing system composed of photosystem I 725
molecular wire gold nanoparticle and double surfactants in water Chem Commun 726
(Camb) 46 2557-2559 727
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
(2009) Surface immobilization of PSI using vitamin K1-like molecular wires for 729
fabrication of a bio-photoelectrode J Nanosci Nanotechnol 9 1722-1726 730
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37
Molina-Heredia FP Wastl J Navarro JA Bendall DS Hervas M Howe CJ De La Rosa 731
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Mullineaux CW Emlyn-Jones D (2005) State transitions an example of acclimation to 733
low-light stress J Exp Bot 56 389-393 734
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J 735
Nanosci Nanotechnol 9 1709-1713 736
Nguyen K Bruce BD (2014) Growing green electricity progress and strategies for use of 737
photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello 742
Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
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understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in 750
Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
complex Plant Cell 3 383-395 752
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
S Cazzaniga S Bassi R (2015) Heterologous expression of moss light-harvesting 764
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38
complex stress-related 1 (LHCSR1) the chlorophyll a-xanthophyll pigment-protein 765
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24340-24354 767
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Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
phosphatase TAP38 in LHCII dephosphorylation and thylakoid electron flow PLoS 771
Biol 8 e1000288 772
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
natural product biosynthesis Protoplasma 253 1197-1209 774
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Lett 581 2768-2775 776
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3619-3639 782
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2189 785
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Protein Increases Electron Transport Rates and Biomass Yield Plant Physiol 175 787
134-145 788
Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J 789
(2017) Plasmon-induced absorption of blind chlorophylls in photosynthetic proteins 790
assembled on silver nanowires Nanoscale 9 10475-10486 791
792
Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
Sakai M Fujii M Tohri A Iwai M Inoue Y Yoneyama S Minakata M Enami I 794
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1585-1587 797
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39
Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M 798
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Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M 800
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molecular wire Biochim Biophys Acta 1767 653-659 802
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N 803
(2006) Functional replacement of ferredoxin by a cyanobacterial flavodoxin in 804
tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050 805
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
U S A 104 11495-11500 809
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M 810
Norici A Shotland Y Ohad I Kaplan A (2016) The mechanisms whereby the 811
green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled 812
photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
Photosystem I-catalyst hybrids Curr Opin Chem Biol 25 1-8 815
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium 816
Synechocystis sp PCC 6803 carrying spinach sequences Construction and function 817
Photosynth Res 48 147-162 818
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene 819
replacement in Synechocystis sp PCC 6803 Microb Cell Fact 13 4 820
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
thaliana J Biol Chem 278 31286-31289 826
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M 827
Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
dependent pathways into Synechocystis sp PCC 6803 Metab Eng 33 1-11 830
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40
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in 831
functional photosystem II complexes of cyanobacteria Proc Natl Acad Sci U S A 98 832
14168-14173 833
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) 834
Photosynthetic electron partitioning between [FeFe]-hydrogenase and 835
ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S 836
A 108 9396-9401 837
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of 838
alternative electron flow by flavodiiron proteins in Arabidopsis Nat Plants 2 16012 839
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ 840
(2018) Ectopic expression of SsPETE2 a plastocyanin from Suaeda salsa improves 841
plant tolerance to oxidative stress Plant Sci 268 1-10 842
843
844
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wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M Thofner JF Olsen CE Mottawie MS Burow M Pribil MFeussner I Moller BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 dependent pathways intoSynechocystis sp PCC 6803 Metab Eng 33 1-11
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Google Scholar Author Only Title Only Author and Title
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in functional photosystem II complexes ofcyanobacteria Proc Natl Acad Sci U S A 98 14168-14173
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) Photosynthetic electron partitioning between [FeFe]-hydrogenase and ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S A 108 9396-9401
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of alternative electron flow by flavodiiron proteins inArabidopsis Nat Plants 2 16012
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ (2018) Ectopic expression of SsPETE2 a plastocyanin fromSuaeda salsa improves plant tolerance to oxidative stress Plant Sci 268 1-10
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
9
proteins that are part of multiprotein complexes (Simkin et al 2017 see Box 3) This 199
indicates that the quantity of such proteins is relevant for growth enhancement and not its 200
evolutionary origin 201
More recently the two Physcomitrella patens flavodiiron protein (FLV) genes FlvA 202
and FlvB were introduced into A thaliana which like other angiosperms has lost FLVs 203
during evolution (Yamamoto et al 2016) FLVs are the main mediators of pseudo-cyclic 204
electron flow in photosynthetic organisms but heterologous expression of FLVs in A 205
thaliana had no effect on steady-state photosynthesis and growth of the transgenic plants 206
(Yamamoto et al 2016) However the Arabidopsis FLV lines displayed higher 207
photosynthetic yields just after the onset of actinic light following a long dark adaptation 208
suggesting that the FLVs mediated a large electron sink during the induction of 209
photosynthesis In fluctuating light experiments the Arabidopsis FLV lines had much less 210
PSI acceptor side limitation implying that the large FLV-mediated electron sink makes 211
photosynthesis more resistant to the fluctuating light Consequently this protective effect of 212
FLVs is more pronounced in Arabidopsis lines that are more sensitive to fluctuating light like 213
the pgr5 mutant defective in antimycin A-sensitive cyclic electron flow (see Box 1 Leister 214
and Shikanai 2013 Yamamoto et al 2016) Similarly expression of FLVs in a rice (Oryza 215
sativa) line with markedly reduced cyclic electron flow restored CO2 assimilation and growth 216
rate to wild-type levels (Wada et al 2018) Like FLVs LHcxLHCSR proteins play a role in 217
photoprotection in green algae and mosses but have been lost in angiosperms during 218
evolution Heterologous expression of P patens LHCSR1 in Nicotiana benthamiana and 219
Nicotiana tabacum yielded an active protein that has properties similar if not identical to 220
those of moss LHCSR1 (Pinnola et al 2015) 221
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10
Efforts to create LHCII complexes like those in plants by heterologously expressing 222
the membrane-spanning light-harvesting chlorophyll ab-binding protein Lhcb from Pisum 223
sp (pea) in Synechocystis were unsuccessful 224
Although the pea Lhcb protein was synthesized in Synechocystis and integrated into 225
the membrane it did not accumulate to steady-state levels detectable by immunoblot analysis 226
(He et al 1999) Possible explanations are that Lhcb is rapidly degraded either because its 227
ldquounfamiliarrdquo structure makes it a good substrate for the cyanobacterial proteolytic system or 228
it cannot foldassemble properly due to the lack of plant-specific pigments or assembly 229
factors Interestingly chlorophyll b production (see Box 2) after introduction of plant 230
chlorophyll a oxygenase (CAO) is boosted when Lhcb is expressed even though LHCII does 231
not accumulate in detectable amounts (Xu et al 2001) 232
Even soluble multiprotein complexes can be heterologously expressed as has been 233
impressively demonstrated from the carbon-fixation end of photosynthesis For example by 234
coexpression of five auxiliary factors a functional plant RuBisCo complex was successfully 235
assembled in Escherichia coli (Aigner et al 2017) This result is in line with the ldquofrozen 236
metabolic staterdquo concept showing that photosynthetic proteins embedded in a network of 237
interactions with other proteins and auxiliary factors can be introduced into distantly related 238
species but only with their own interaction networks While Gimpel et al (2016) showed that 239
efficient gene expression needs to be accounted for when designing synthetic modules for the 240
transfer of photosystem subunits from one species to another Aigner et al (2017) 241
demonstrated that auxiliary factors required for the biogenesis of photosynthetic 242
(sub)complexes need to be considered in such experiments adding additional facets to the 243
ldquofrozen metabolic staterdquo concept 244
Auxiliary factors required for the accumulation of photosynthetic multiprotein 245
complexes include (i) cofactors like iron-sulfur clusters and pigments (see Box 2) (ii) 246
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11
chaperones that are required for the insertion of co-factors (eg pigments into LHCs Schmid 247
2008) and (iii) assembly factors Assembly factors are required to support the stepwise 248
assembly and functionality of the multiproteinpigment complexes and many of these are 249
conserved between photosynthetic species (Nixon et al 2010 Nickelsen and Rengstl 2013 250
Jensen and Leister 2014) Therefore the exchange of entire multiprotein complexes between 251
distantly related species will not be simple due to the repertoire of auxiliary factors that has 252
markedly changed during evolution Since the species that Gimpel et al (2016) studied were 253
closely related this aspect could be neglected In consequence the impact of these auxiliary 254
factors on the formation of multiproteinpigment complexes will have to be fully elucidated 255
to understand which factors are sufficient to assemble a photosynthetic multiprotein complex 256
previous (genetic) approaches only identified factors required for this process Hence the 257
transfer of entire photosynthetic (sub)complexes between distantly related species by a 258
ldquosynthetic photosynthetic modulerdquo must include entire sets of strongly interacting proteins (to 259
address the ldquofrozen metabolic staterdquo) as well as all genetic elements and auxiliary factors 260
sufficient for efficient expression biogenesis and function of the proteins in the module 261
262
Bio-bio hybrids using photosynthesis as an electron source for unrelated biological 263
processes 264
The idea of using the reducing power of photosynthesis to drive unrelated metabolic reactions 265
has inspired several biotechnological concepts The photosynthesis-driven formation of 266
secondary metabolites has been demonstrated in vivo whereas light-driven generation of H2 267
by bio-bio hybrids so far works only in vitro and is closely related to bio-nano approaches 268
Therefore coupling of photosynthesis to previously unrelated pathways is discussed here 269
first followed by bio-bio systems for H2 generation 270
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12
Redirection of PSI reducing equivalents to drive reactions catalyzed by cytochrome 271
P450 enzymes has been achieved in vivo by genetic modifications of plants and 272
cyanobacteria (Lassen et al 2014a Nielsen et al 2016 Mellor et al 2017) Cytochrome 273
P450s constitute the largest family of plant enzymes that acts on various endogenous and 274
xenobiotic molecules (Rasool and Mohamed 2016) Their extreme versatility and 275
irreversibility of catalyzed reactions make these enzymes very attractive for use in 276
biotechnology medicine and phytoremediation P450s are monooxygenases that insert an 277
oxygen atom into hydrophobic molecules which enhances their reactivity and hydrophilicity 278
Most eukaryotic P450s require NADPHcytochrome P450 reductase as the electron donor 279
The ER membrane is generally accepted to be the primary subcellular repository of 280
eukaryotic P450s and their NADPHcytochrome P450 reductase By relocating cytochrome 281
P450s to the chloroplasts the reducing power of photosynthesis can be directly targeted to 282
the reactions catalyzed by these enzymes thus providing the basis for the large-scale 283
production of valuable products Initial attempts to couple P450s with photosynthesis were 284
conducted in vitro (Table 3 Fig 4A) Spinach chloroplasts were combined with microsomes 285
from yeast cells that had been stably transformed with a fusion gene expressing the rat 286
CYP1A1-NADPHcytochrome P450 reductase fusion enzyme (Kim et al 1996) These 287
experiments confirmed that it is feasible to drive P450-mediated reactions using electrons 288
derived from photosynthetically generated NADPH Intriguingly the NADPHcytochrome 289
P450 reductase is not always essential as demonstrated by co-incubating CYP79A1 from 290
sorghum (Sorghum bicolor) with barley (Hordeum vulgare) PSI and employing ferredoxin to 291
directly deliver electrons from PSI to the P450 (Jensen et al 2011) This approach was also 292
shown to be practicable in vivo CYP79A1 either alone or in combination with CYP71E1 293
and the UDP-glucosyltransferase UGT85B1 was first targeted in vivo to cyanobacterial or 294
plant thylakoid membranes where they catalyzed the same reactions as in their original 295
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13
cellular compartment (the ER) utilizing photosynthetically reduced ferredoxin as the electron 296
donor (Nielsen et al 2013 Lassen et al 2014b Gnanasekaran et al 2016 Wlodarczyk et 297
al 2016) Genetic fusions have also been employed for the coupling of P450s to PSI 298
CYP79A1 has been fused to either cyanobacterial PsaM or Arabidopsis ferredoxin and the 299
engineered enzyme showed light-driven activity both in vivo and in vitro (Lassen et al 300
2014b Mellor et al 2016) In the latter case the efficiency of the system was enhanced 301
because the fusion could compete better with endogenous electron sinks coupled to metabolic 302
pathways (Mellor et al 2016) 303
In contrast to PSI-P450 hybrids PSI-hydrogenase hybrids currently function only in 304
vitro Unlike fossil fuels H2 is environmentally benign as it produces only water when 305
combusted Therefore in principle harnessing of the reducing power of photosynthesis for 306
the direct production of H2 (ie ultimately using sunlight and water) would yield a fully 307
sustainable system of energy generation PSI but not PSII provides a standard midpoint 308
potential that is sufficiently negative to power the reduction of protons to H2 (Utschig et al 309
2015) Hence approaches have been developed to engineer PSI to produce H2 either as 310
replacement or in addition to its natural product NADPH (see Figure 1 in Box 1) by 311
redirecting PSI electrons to a catalytic component This catalytic component can be abiotic or 312
biotic (hydrogenases) The feasibility of coupling H2 generation to photosynthesis was 313
demonstrated 45 years ago by mixing chloroplast preparations with ferredoxin and 314
hydrogenase (Benemann et al 1973) Twenty-five years later hydrogen evolution by direct 315
electron transfer (without ferredoxin) from PSI to hydrogenases was accomplished for the 316
first time (McTavish 1998) 317
Hydrogenases catalyze the reversible interconversion of H2 into protons and electrons 318
and are widespread in nature they occur in bacteria and archaea but also in some eukarya In 319
vivo hydrogenases can mediate photosynthetic H2 production albeit mostly indirectly or 320
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14
under anaerobic conditions due to their oxygen sensitivity (Ghirardi 2015 Oey et al 2016) 321
Hydrogenases can be classified according to their metal-ion composition eg [NiFe] and 322
[FeFe] hydrogenases (Lubitz et al 2014 Martin and Frymier 2017) [FeFe] hydrogenases 323
preferentially catalyze proton reduction and can evolve H2 at high rates but are extremely 324
sensitive to O2 and are the only type of hydrogenases found in eukaryotic microorganisms 325
[NiFe] hydrogenases are less sensitive to O2 but preferentially oxidize H2 under 326
physiological conditions (Lubitz et al 2014) In vitro both types of hydrogenases have been 327
directly linked to PSI (Table 3 Fig 4B) PSI-[NiFe] hydrogenase complexes have been 328
generated by fusing the hydrogenase genetically to the PsaE protein (Ihara et al 2006a) PSI-329
[FeFe] hydrogenase complexes were obtained by genetically fusing the hydrogenase to 330
ferredoxin (Yacoby et al 2011) or covalently linking the FeS clusters present in the 331
hydrogenase to PSI via a molecular wire (Lubner et al 2010 Lubner et al 2011) 332
Two parameters characterize the efficiency of these in-vitro systems their H2 333
production rate and longevity While low rates of H2 production (in the range from 01 to 10 334
μmol H2mg chlorophyllh) were described for the early chloroplast extract experiments and 335
genetic fusions of PSI to [NiFe] or [FeFe] hydrogenases (McTavish 1998 Ihara et al 2006a 336
Yacoby et al 2011) higher rates of between 2000 and 3000 μmol H2mg chlorophyllh have 337
been achieved with wired PSI-[FeFe] hydrogenase complexes and genetically fused PSI-338
[NiFe] hydrogenase complexes assembled on a gold electrode (Krassen et al 2009 Lubner 339
et al 2011) Few data are available with respect to the longevity of the PSI-hydrogenase 340
systems however a minimum lifetime of 64 days was reported for a wired [FeFe] 341
hydrogenase-PSI complex at room temperature and under ambient illumination (Lubner et 342
al 2010) 343
The future use of hydrogenases in photosynthesis-driven H2 production will strongly 344
depend on whether or not it is possible to overcome the O2 sensitivity of many hydrogenases 345
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15
by for instance employing oxygen-tolerant [NiFe] hydrogenases (Burgdorf et al 2005 346
Schiffels et al 2013) If this is not possible their efficient use in vivo in thylakoids which 347
inevitably generate O2 during linear electron flow will be impossible However as 348
demonstrated with the gold surface system (Krassen et al 2009) the design of novel 349
matrices into which the hybrid system can be incorporated may markedly enhance the 350
efficiency 351
352
Bio-nano hybrids Use of photosynthesis as a source of electrons for non-biological 353
processes 354
From bio-bio hybrids it is only a small step to developing bio-nano hybrids as demonstrated 355
by PSI hybrids that employ abiotic catalysts for photosynthetic hydrogen production instead 356
of hydrogenase In fact abiotic catalysts have the advantage of bypassing the lability of 357
hydrogenases in the presence of oxygen PSI-platinum hybrids have been produced by 358
combining PSI with platinum nanoparticles (either directly or via tethering by nanowires) or 359
platinum nanoclusters (Kargul et al 2012 Fukuzumi 2015 Utschig et al 2015) (Fig 5A 360
Table 4) Current PSI-platinum hybrids are less efficient than the most advanced PSI-361
hydrogenase systems but are extremely robust (Utschig et al 2015) However future 362
widespread usage of the PSI-platinum system will be limited by the high cost of platinum A 363
more economical alternative to precious metals are earth-abundant molecular catalysts 364
However hybrids consisting of PSI and earth-abundant molecular catalysts have a much 365
shorter working life than platinum-based configurations (Utschig et al 2015) likely due to 366
instability of the molecular catalyst 367
PSI-based photocurrent-producing devices constitute another class of photosynthesis-368
derived nano-bio systems (Table 4 Fig 5) In such devices PSI is immobilized onto 369
electrodes Many variants of this concept have been tested such as varying the electrode 370
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16
materials immobilizationorientation strategies andor artificial redox mediators (Nguyen and 371
Bruce 2014 Janna Olmos and Kargul 2015 Plumereacute and Nowaczyk 2017 Kargul et al 372
2018) PSI must be immobilized on the electrode surface in such a way that electron transfers 373
between the electrodes and the oxidizing (P700) and reducing (FB - the terminal [4Fe-4S] 374
cluster or an intermediate electron transporter) sites of PSI can proceed with the required 375
efficiency Electrons are transferred between the electrodes and the oxidizing or reducing 376
sides of PSI either by a diffusible redox mediator or molecular wires Examples of electrode 377
materials and redox mediators are provided in Table 4 After P700 photo-excitation electrons 378
are transferred from P700 via several factors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB) to the 379
iron-sulfur cluster FB (see legend of Box 1) As in the case of PSI-hydrogenase and PSI-380
platinum nanoparticles PSI can be wired to its electrodes This has been achieved by wiring 381
the A1 cofactor (phylloquinone) to the substrate surface such that electrons are directly 382
transferred from A1 to the electrode thus bypassing the downstream FeS clusters (FX FA FB) 383
in the stromal domain of PSI (Terasaki et al 2007 Miyachi et al 2009 Terasaki et al 384
2009 Miyachi et al 2010) 385
Modifications of PSI have been utilized to enhance the efficiency of the photocurrent-386
generating system (Das et al 2004 Frolov et al 2005 Carmeli et al 2010) As mentioned 387
previously fusions to the stroma-faced PSI subunit PsaE can be used to link new components 388
to PSI however in this case PsaD fusions were used To this end recombinant His-tagged 389
PsaD was immobilized on the functionalized electrode surface which was then exposed to 390
native PSI complexes resulting in immobilized PSI with P700 facing away from the 391
electrode (Das et al 2004) Another way to control the orientation of PSI during 392
immobilization involves introducing cysteine mutations To allow for direct thiol coupling to 393
an Au surface various residues on the lumen-exposed face of PSI were replaced by cysteine 394
and tested (Frolov et al 2005) PSI attachment was achieved with all single mutants even 395
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17
those placed further from the P700 site suggesting that a specific location is not required as 396
long as the cysteine is exposed at the luminal surface of PSI The concept of targeted 397
attachment via introduced cysteine residues was exploited in subsequent studies to link PSI to 398
maleimide-functionalized gallium arsenide (Frolov et al 2008) to immobilize PSI between 399
the substrate and a metallized scanning near-field optical microscopy tip (Gerster et al 400
2012) and to bind PSI to carbon nanotubes (Kaniber et al 2010) Another modification of 401
PSI is represented by the attachment of plasmonic metal nanoparticles which resulted in 402
enhanced light absorption (Carmeli et al 2010) even in the green part of the solar spectrum 403
that is not normally absorbed (Szalkowski et al 2017) This suggests that it is possible to 404
enhance light absorption by PSI in vitro through the attachment of abiotic components that 405
act as optical antennae to extend the spectrum of photons available for P700 activation 406
Taken together these efforts demonstrate that PSI-based photocurrent-generating 407
systems are still in an exploratory phase with many variants under development In the next 408
phase viable building blocks and reference systems should be established that can serve as 409
starting points for the systematic engineering of superior systems This will require the 410
modification of PSI for optimal effect in artificial systems and will undoubtedly differ 411
substantially from the original environment in which PSI was molded by biological 412
evolution 413
414
Concluding remarks and outlook 415
Enhancing photosynthesis and growth can be achieved by a simple overexpression of certain 416
photosynthetic proteins and PSI can be coupled to previously unconnected biotic or abiotic 417
components to generate valuable compounds hydrogen or electricity Moreover entire 418
photosynthetic complexes can be functionally expressed in distantly related species (as 419
demonstrated for RuBisCO Aigner et al 2017) Thus what are the next goals and which 420
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18
challenges need to be overcome Two challenges for the in vivo systems are obvious (i) 421
enhancing the efficiency of in-vivo bio-bio hybrids and (ii) upscaling the size of ldquosynthetic 422
photosynthetic modulesrdquo to cover entire photosystems or complex antenna systems 423
With respect to the enhancement of in vivo cyanobacterial and algal systems 424
harboring hybrid configurations in which photosynthesis directly drives previously 425
unconnected pathways the use of laboratory evolution offers a unique opportunity to tailor 426
these systems for their intended purpose Laboratory evolution utilizes the high rate of 427
evolution typical in microbial systems (in particular if suitable selection conditions can be 428
designed) to fine tune and optimize processes through selection of advantageous genetic 429
variation While this strategy has been employed in E coli and yeast with impressive success 430
now photosynthetic microbial systems are emerging as attractive targets for this approach 431
(Leister 2017) 432
The exchange of entire multiprotein complexes between distantly related species will 433
not be a simple exercise because the ldquofrozen metabolic staterdquo of the core photosynthetic 434
complexes will necessitate the exchange of major parts of photosystems rather than 435
individual subunits The RuBisCO case study by Aigner et al (2017) represents of promising 436
proof of principle but one needs to consider that the synthetic RuBisCO module comprised 437
only the two different subunits present in the mature complex and five auxiliary factors for its 438
assembly Entire photosystems will require much larger ldquosynthetic photosynthetic modulesrdquo 439
and many of the auxiliary factors have not been identified yet Therefore when designing 440
these complex ldquosynthetic photosynthetic modulesrdquo we will identify the set of components 441
that are sufficient (and not only necessary) to drive photosynthesis providing an 442
unprecedentedly deep understanding of this fundamental and complex process 443
Given that the problems described above can be solved what will be the next steps in 444
the synthetic biology of the light reactions of photosynthesis The combination of ldquosynthetic 445
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19
photosynthetic modulesrdquo from diverse species could allow the design of novel variants of 446
photosynthesis Numerous instances of such ldquorecombined photosynthetic variantsrdquo can be 447
imagined including plants that employ cyanobacteria-derived phycobilisomes for highly 448
sufficient photosynthesis under low light conditions cyanobacteria that employ plant-derived 449
LHCs as antenna to shift light saturation of photosynthesis to higher intensities or the 450
integration of cyanobacterial Chl d and Chl f (which can absorb far-red and near infra-red 451
light) into algal or plant photosynthesis to expand the spectral region available to drive 452
photosynthesis (Loughlin et al 2013 Ho et al 2016) Moreover such variants of 453
recombined photosynthesis could be further optimized by laboratory evolution within a 454
suitable microbial chassis However such recombined photosynthetic variants cannot be 455
considered a truly novel type of photosynthesis because they would only bring preexisting 456
pieces together that evolution has separated Nevertheless they could be an important step 457
towards the ambitious goal to design truly novel ldquosynthetic photosynthetic modulesrdquo that 458
contain more efficient substitutes of the ldquofrozen metabolic accidentsrdquo discussed above 459
Ample proof of functionality for in-vivo hybrids (between photosynthesis and 460
previously unconnected metabolic pathways) and in-vitro hybrids (between PSI and biotic or 461
abiotic catalysts) has been obtained but such systems will only be commercially successful if 462
they can compete with established non-biological systems Tailoring of PSI in cyanobacteria 463
where techniques like gene replacement and gene modification are routine may contribute to 464
further improving the efficiency and robustness of in vitro and in vivo hybrids One 465
promising route could be to identify those parts of the original PSI (which evolved under 466
constraints imposed by the cyanobacterial cell) that are necessary for hybrid devices (a 467
ldquominimalrdquo PSI) Such bio-nano systems can be optimized to include novel non-biological 468
components that replace or complement natural pigments andor the protein-based backbone 469
of photosystems going far beyond the limited toolbox of Naturersquos chemistry Such novel 470
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20
systems inspired by natural photosynthesis could be used to engage biologists in the design 471
of fundamentally different types of photosynthesis in living organisms 472
473
SUPPLEMENTAL DATA 474
Supplemental Table 1 Absencepresence of photosynthetic proteins in the three model 475
species Synechocystis PCC6803 (Syn) Chlamydomonas reinhardtii (Cr) and Arabidopsis 476
thaliana (At) 477
478
ACKNOWLEDGMENTS 479
The authors thank Paul Hardy for critical reading of the manuscript 480
481
482
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21
Table 1 Replacement of conserved individual or multiple photosynthetic proteins 483
GeneProtein Description Protein
identity
Reference
psbAD1 Synechocystis D1 was replaced by its homolog from
Poa annua which resulted in slower growth This is
likely to be due to increased charge recombination
between the donor and acceptor sides of the reaction
center
86 Nixon et al
1991
psbBCP47 Synechocystis CP47 was replaced by its homolog
from spinach and photoautotrophy was lost
80 Vermaas et
al 1996
psbCCP43 Synechocystis CP43 was replaced by its homolog
from spinach and photoautotrophy was lost
85 Carpenter et
al 1993
psbHPsbH Synechocystis PsbH was replaced by its counterpart
from maize The resulting strain displayed increased
light sensitivity and lower chlorophyll content
78 Chiaramonte
et al 1999
psaAPsaA Synechocystis PsaA was replaced by its equivalent
from A thaliana This resulted in reduced photo-
autotrophical growth and a drastically reduced
ChlPC ratio
80 Viola et al
2014
psbABCDEF
D1CP47CP43D2
Cyt b559-+
All six core subunits of C reinhardtii were replaced
by their counterparts from two different green algae
(V carteri and S obliquus) The resulting strains
were photoautotrophic but showed reduced
photosynthetic efficiency and the heterologous
82 -
99
Gimpel et al
2016
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22
proteins reached only between 10 and 20 of the
levels of those they replaced
484
485
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23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
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24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
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25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
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26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
32
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566
Aigner H Wilson RH Bracher A Calisse L Bhat JY Hartl FU Hayer-Hartl M (2017) 567
Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
chloroplast-ferredoxin-hydrogenase system Proc Natl Acad Sci U S A 70 2317-2320 571
Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
complements ferredoxin deficiency in knocked-down transgenic tobacco plants Plant 574
J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
photosynthesis for energy production Curr Opin Chem Biol 17 457-461 577
Burgdorf T Lenz O Buhrke T van der Linden E Jones AK Albracht SP Friedrich B 578
(2005) [NiFe]-hydrogenases of Ralstonia eutropha H16 modular enzymes for 579
oxygen-tolerant biological hydrogen oxidation J Mol Microbiol Biotechnol 10 181-580
96 581
Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
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nanoparticle antennas Nano Lett 10 2069-2074 584
Carpenter SD Ohad I Vermaas WF (1993) Analysis of chimeric spinachcyanobacterial 585
CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
the water-splitting system of Photosystem II Biochim Biophys Acta 1144 204-212 587
Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
Eur J Biochem 260 833-843 593
Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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33
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Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel 601
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Das R Kiley PJ Segal M Norville J Yu AA Wang L Trammell SA Reddick LE 603
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Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
by thermal dissipation of excess energy Biochem Soc Trans 38 651-660 608
Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
device by direct chemical binding of the photosynthetic reaction center protein to 610
metal surfaces Advanced Materials 17 2434-2437 611
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13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I 617
Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
reinhardtii ACS Synth Biol 5 589-596 624
Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
state biophotovoltaic cells containing photosystem I Adv Mater 26 4863-4869 630
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supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
harvesting chlorophyll ab-binding protein in Synechocystis sp PCC 6803 Eur J 643
Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
synthase is a highly divergent paralog of PsbA of photosystem II Science 353 646
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Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
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66 37-44 657
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c553 minimises charge recombination and enhances photovoltaic performance of the 660
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ACS Chem Biol 6 533-539 663
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35
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Improving photosynthesis and crop productivity by accelerating recovery from 681
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Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
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products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
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Plant Sci 3 199 694
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Photosynth Res 116 277-293 705
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4148 707
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enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
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Rev Plant Biol 64 609-635 741
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biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
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hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
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phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
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236-248 762
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134-145 788
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Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
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1585-1587 797
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
39
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molecular wire Biochim Biophys Acta 1767 653-659 802
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N 803
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tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050 805
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
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green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled 812
photodamage resistance New Phytol 210 1229-1243 813
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Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium 816
Synechocystis sp PCC 6803 carrying spinach sequences Construction and function 817
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Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
thaliana J Biol Chem 278 31286-31289 826
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M 827
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40
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in 831
functional photosystem II complexes of cyanobacteria Proc Natl Acad Sci U S A 98 832
14168-14173 833
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) 834
Photosynthetic electron partitioning between [FeFe]-hydrogenase and 835
ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S 836
A 108 9396-9401 837
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of 838
alternative electron flow by flavodiiron proteins in Arabidopsis Nat Plants 2 16012 839
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ 840
(2018) Ectopic expression of SsPETE2 a plastocyanin from Suaeda salsa improves 841
plant tolerance to oxidative stress Plant Sci 268 1-10 842
843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M Iwai M Taguchi S Enami I Inoue Y Yamanoi YYonezawa T Mizuno K Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M (2007) Bio-photosensorCyanobacterial photosystem I coupled with transistor via molecular wire Biochim Biophys Acta 1767 653-659
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N (2006) Functional replacement of ferredoxin by acyanobacterial flavodoxin in tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR Carrillo N (2007) Enhanced plant tolerance to ironstarvation by functional substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci U S A 104 11495-11500
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M Norici A Shotland Y Ohad I Kaplan A (2016) Themechanisms whereby the green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled photodamage resistanceNew Phytol 210 1229-1243
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from Photosystem I-catalyst hybrids Curr Opin Chem Biol25 1-8
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium Synechocystis sp PCC 6803 carrying spinachsequences Construction and function Photosynth Res 48 147-162
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Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene replacement in Synechocystis sp PCC 6803Microb Cell Fact 13 4
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Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron Protein Substitutes for Cyclic Electron Flow withoutCompeting CO2 Assimilation in Rice Plant Physiol 176 1509-1518
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Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) Plastocyanin is indispensable for photosyntheticelectron flow in Arabidopsis thaliana J Biol Chem 278 31286-31289
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Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M Thofner JF Olsen CE Mottawie MS Burow M Pribil MFeussner I Moller BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 dependent pathways intoSynechocystis sp PCC 6803 Metab Eng 33 1-11
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Copyright copy 2018 American Society of Plant Biologists All rights reserved
Google Scholar Author Only Title Only Author and Title
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in functional photosystem II complexes ofcyanobacteria Proc Natl Acad Sci U S A 98 14168-14173
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Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) Photosynthetic electron partitioning between [FeFe]-hydrogenase and ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S A 108 9396-9401
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
10
Efforts to create LHCII complexes like those in plants by heterologously expressing 222
the membrane-spanning light-harvesting chlorophyll ab-binding protein Lhcb from Pisum 223
sp (pea) in Synechocystis were unsuccessful 224
Although the pea Lhcb protein was synthesized in Synechocystis and integrated into 225
the membrane it did not accumulate to steady-state levels detectable by immunoblot analysis 226
(He et al 1999) Possible explanations are that Lhcb is rapidly degraded either because its 227
ldquounfamiliarrdquo structure makes it a good substrate for the cyanobacterial proteolytic system or 228
it cannot foldassemble properly due to the lack of plant-specific pigments or assembly 229
factors Interestingly chlorophyll b production (see Box 2) after introduction of plant 230
chlorophyll a oxygenase (CAO) is boosted when Lhcb is expressed even though LHCII does 231
not accumulate in detectable amounts (Xu et al 2001) 232
Even soluble multiprotein complexes can be heterologously expressed as has been 233
impressively demonstrated from the carbon-fixation end of photosynthesis For example by 234
coexpression of five auxiliary factors a functional plant RuBisCo complex was successfully 235
assembled in Escherichia coli (Aigner et al 2017) This result is in line with the ldquofrozen 236
metabolic staterdquo concept showing that photosynthetic proteins embedded in a network of 237
interactions with other proteins and auxiliary factors can be introduced into distantly related 238
species but only with their own interaction networks While Gimpel et al (2016) showed that 239
efficient gene expression needs to be accounted for when designing synthetic modules for the 240
transfer of photosystem subunits from one species to another Aigner et al (2017) 241
demonstrated that auxiliary factors required for the biogenesis of photosynthetic 242
(sub)complexes need to be considered in such experiments adding additional facets to the 243
ldquofrozen metabolic staterdquo concept 244
Auxiliary factors required for the accumulation of photosynthetic multiprotein 245
complexes include (i) cofactors like iron-sulfur clusters and pigments (see Box 2) (ii) 246
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11
chaperones that are required for the insertion of co-factors (eg pigments into LHCs Schmid 247
2008) and (iii) assembly factors Assembly factors are required to support the stepwise 248
assembly and functionality of the multiproteinpigment complexes and many of these are 249
conserved between photosynthetic species (Nixon et al 2010 Nickelsen and Rengstl 2013 250
Jensen and Leister 2014) Therefore the exchange of entire multiprotein complexes between 251
distantly related species will not be simple due to the repertoire of auxiliary factors that has 252
markedly changed during evolution Since the species that Gimpel et al (2016) studied were 253
closely related this aspect could be neglected In consequence the impact of these auxiliary 254
factors on the formation of multiproteinpigment complexes will have to be fully elucidated 255
to understand which factors are sufficient to assemble a photosynthetic multiprotein complex 256
previous (genetic) approaches only identified factors required for this process Hence the 257
transfer of entire photosynthetic (sub)complexes between distantly related species by a 258
ldquosynthetic photosynthetic modulerdquo must include entire sets of strongly interacting proteins (to 259
address the ldquofrozen metabolic staterdquo) as well as all genetic elements and auxiliary factors 260
sufficient for efficient expression biogenesis and function of the proteins in the module 261
262
Bio-bio hybrids using photosynthesis as an electron source for unrelated biological 263
processes 264
The idea of using the reducing power of photosynthesis to drive unrelated metabolic reactions 265
has inspired several biotechnological concepts The photosynthesis-driven formation of 266
secondary metabolites has been demonstrated in vivo whereas light-driven generation of H2 267
by bio-bio hybrids so far works only in vitro and is closely related to bio-nano approaches 268
Therefore coupling of photosynthesis to previously unrelated pathways is discussed here 269
first followed by bio-bio systems for H2 generation 270
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12
Redirection of PSI reducing equivalents to drive reactions catalyzed by cytochrome 271
P450 enzymes has been achieved in vivo by genetic modifications of plants and 272
cyanobacteria (Lassen et al 2014a Nielsen et al 2016 Mellor et al 2017) Cytochrome 273
P450s constitute the largest family of plant enzymes that acts on various endogenous and 274
xenobiotic molecules (Rasool and Mohamed 2016) Their extreme versatility and 275
irreversibility of catalyzed reactions make these enzymes very attractive for use in 276
biotechnology medicine and phytoremediation P450s are monooxygenases that insert an 277
oxygen atom into hydrophobic molecules which enhances their reactivity and hydrophilicity 278
Most eukaryotic P450s require NADPHcytochrome P450 reductase as the electron donor 279
The ER membrane is generally accepted to be the primary subcellular repository of 280
eukaryotic P450s and their NADPHcytochrome P450 reductase By relocating cytochrome 281
P450s to the chloroplasts the reducing power of photosynthesis can be directly targeted to 282
the reactions catalyzed by these enzymes thus providing the basis for the large-scale 283
production of valuable products Initial attempts to couple P450s with photosynthesis were 284
conducted in vitro (Table 3 Fig 4A) Spinach chloroplasts were combined with microsomes 285
from yeast cells that had been stably transformed with a fusion gene expressing the rat 286
CYP1A1-NADPHcytochrome P450 reductase fusion enzyme (Kim et al 1996) These 287
experiments confirmed that it is feasible to drive P450-mediated reactions using electrons 288
derived from photosynthetically generated NADPH Intriguingly the NADPHcytochrome 289
P450 reductase is not always essential as demonstrated by co-incubating CYP79A1 from 290
sorghum (Sorghum bicolor) with barley (Hordeum vulgare) PSI and employing ferredoxin to 291
directly deliver electrons from PSI to the P450 (Jensen et al 2011) This approach was also 292
shown to be practicable in vivo CYP79A1 either alone or in combination with CYP71E1 293
and the UDP-glucosyltransferase UGT85B1 was first targeted in vivo to cyanobacterial or 294
plant thylakoid membranes where they catalyzed the same reactions as in their original 295
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13
cellular compartment (the ER) utilizing photosynthetically reduced ferredoxin as the electron 296
donor (Nielsen et al 2013 Lassen et al 2014b Gnanasekaran et al 2016 Wlodarczyk et 297
al 2016) Genetic fusions have also been employed for the coupling of P450s to PSI 298
CYP79A1 has been fused to either cyanobacterial PsaM or Arabidopsis ferredoxin and the 299
engineered enzyme showed light-driven activity both in vivo and in vitro (Lassen et al 300
2014b Mellor et al 2016) In the latter case the efficiency of the system was enhanced 301
because the fusion could compete better with endogenous electron sinks coupled to metabolic 302
pathways (Mellor et al 2016) 303
In contrast to PSI-P450 hybrids PSI-hydrogenase hybrids currently function only in 304
vitro Unlike fossil fuels H2 is environmentally benign as it produces only water when 305
combusted Therefore in principle harnessing of the reducing power of photosynthesis for 306
the direct production of H2 (ie ultimately using sunlight and water) would yield a fully 307
sustainable system of energy generation PSI but not PSII provides a standard midpoint 308
potential that is sufficiently negative to power the reduction of protons to H2 (Utschig et al 309
2015) Hence approaches have been developed to engineer PSI to produce H2 either as 310
replacement or in addition to its natural product NADPH (see Figure 1 in Box 1) by 311
redirecting PSI electrons to a catalytic component This catalytic component can be abiotic or 312
biotic (hydrogenases) The feasibility of coupling H2 generation to photosynthesis was 313
demonstrated 45 years ago by mixing chloroplast preparations with ferredoxin and 314
hydrogenase (Benemann et al 1973) Twenty-five years later hydrogen evolution by direct 315
electron transfer (without ferredoxin) from PSI to hydrogenases was accomplished for the 316
first time (McTavish 1998) 317
Hydrogenases catalyze the reversible interconversion of H2 into protons and electrons 318
and are widespread in nature they occur in bacteria and archaea but also in some eukarya In 319
vivo hydrogenases can mediate photosynthetic H2 production albeit mostly indirectly or 320
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14
under anaerobic conditions due to their oxygen sensitivity (Ghirardi 2015 Oey et al 2016) 321
Hydrogenases can be classified according to their metal-ion composition eg [NiFe] and 322
[FeFe] hydrogenases (Lubitz et al 2014 Martin and Frymier 2017) [FeFe] hydrogenases 323
preferentially catalyze proton reduction and can evolve H2 at high rates but are extremely 324
sensitive to O2 and are the only type of hydrogenases found in eukaryotic microorganisms 325
[NiFe] hydrogenases are less sensitive to O2 but preferentially oxidize H2 under 326
physiological conditions (Lubitz et al 2014) In vitro both types of hydrogenases have been 327
directly linked to PSI (Table 3 Fig 4B) PSI-[NiFe] hydrogenase complexes have been 328
generated by fusing the hydrogenase genetically to the PsaE protein (Ihara et al 2006a) PSI-329
[FeFe] hydrogenase complexes were obtained by genetically fusing the hydrogenase to 330
ferredoxin (Yacoby et al 2011) or covalently linking the FeS clusters present in the 331
hydrogenase to PSI via a molecular wire (Lubner et al 2010 Lubner et al 2011) 332
Two parameters characterize the efficiency of these in-vitro systems their H2 333
production rate and longevity While low rates of H2 production (in the range from 01 to 10 334
μmol H2mg chlorophyllh) were described for the early chloroplast extract experiments and 335
genetic fusions of PSI to [NiFe] or [FeFe] hydrogenases (McTavish 1998 Ihara et al 2006a 336
Yacoby et al 2011) higher rates of between 2000 and 3000 μmol H2mg chlorophyllh have 337
been achieved with wired PSI-[FeFe] hydrogenase complexes and genetically fused PSI-338
[NiFe] hydrogenase complexes assembled on a gold electrode (Krassen et al 2009 Lubner 339
et al 2011) Few data are available with respect to the longevity of the PSI-hydrogenase 340
systems however a minimum lifetime of 64 days was reported for a wired [FeFe] 341
hydrogenase-PSI complex at room temperature and under ambient illumination (Lubner et 342
al 2010) 343
The future use of hydrogenases in photosynthesis-driven H2 production will strongly 344
depend on whether or not it is possible to overcome the O2 sensitivity of many hydrogenases 345
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15
by for instance employing oxygen-tolerant [NiFe] hydrogenases (Burgdorf et al 2005 346
Schiffels et al 2013) If this is not possible their efficient use in vivo in thylakoids which 347
inevitably generate O2 during linear electron flow will be impossible However as 348
demonstrated with the gold surface system (Krassen et al 2009) the design of novel 349
matrices into which the hybrid system can be incorporated may markedly enhance the 350
efficiency 351
352
Bio-nano hybrids Use of photosynthesis as a source of electrons for non-biological 353
processes 354
From bio-bio hybrids it is only a small step to developing bio-nano hybrids as demonstrated 355
by PSI hybrids that employ abiotic catalysts for photosynthetic hydrogen production instead 356
of hydrogenase In fact abiotic catalysts have the advantage of bypassing the lability of 357
hydrogenases in the presence of oxygen PSI-platinum hybrids have been produced by 358
combining PSI with platinum nanoparticles (either directly or via tethering by nanowires) or 359
platinum nanoclusters (Kargul et al 2012 Fukuzumi 2015 Utschig et al 2015) (Fig 5A 360
Table 4) Current PSI-platinum hybrids are less efficient than the most advanced PSI-361
hydrogenase systems but are extremely robust (Utschig et al 2015) However future 362
widespread usage of the PSI-platinum system will be limited by the high cost of platinum A 363
more economical alternative to precious metals are earth-abundant molecular catalysts 364
However hybrids consisting of PSI and earth-abundant molecular catalysts have a much 365
shorter working life than platinum-based configurations (Utschig et al 2015) likely due to 366
instability of the molecular catalyst 367
PSI-based photocurrent-producing devices constitute another class of photosynthesis-368
derived nano-bio systems (Table 4 Fig 5) In such devices PSI is immobilized onto 369
electrodes Many variants of this concept have been tested such as varying the electrode 370
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16
materials immobilizationorientation strategies andor artificial redox mediators (Nguyen and 371
Bruce 2014 Janna Olmos and Kargul 2015 Plumereacute and Nowaczyk 2017 Kargul et al 372
2018) PSI must be immobilized on the electrode surface in such a way that electron transfers 373
between the electrodes and the oxidizing (P700) and reducing (FB - the terminal [4Fe-4S] 374
cluster or an intermediate electron transporter) sites of PSI can proceed with the required 375
efficiency Electrons are transferred between the electrodes and the oxidizing or reducing 376
sides of PSI either by a diffusible redox mediator or molecular wires Examples of electrode 377
materials and redox mediators are provided in Table 4 After P700 photo-excitation electrons 378
are transferred from P700 via several factors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB) to the 379
iron-sulfur cluster FB (see legend of Box 1) As in the case of PSI-hydrogenase and PSI-380
platinum nanoparticles PSI can be wired to its electrodes This has been achieved by wiring 381
the A1 cofactor (phylloquinone) to the substrate surface such that electrons are directly 382
transferred from A1 to the electrode thus bypassing the downstream FeS clusters (FX FA FB) 383
in the stromal domain of PSI (Terasaki et al 2007 Miyachi et al 2009 Terasaki et al 384
2009 Miyachi et al 2010) 385
Modifications of PSI have been utilized to enhance the efficiency of the photocurrent-386
generating system (Das et al 2004 Frolov et al 2005 Carmeli et al 2010) As mentioned 387
previously fusions to the stroma-faced PSI subunit PsaE can be used to link new components 388
to PSI however in this case PsaD fusions were used To this end recombinant His-tagged 389
PsaD was immobilized on the functionalized electrode surface which was then exposed to 390
native PSI complexes resulting in immobilized PSI with P700 facing away from the 391
electrode (Das et al 2004) Another way to control the orientation of PSI during 392
immobilization involves introducing cysteine mutations To allow for direct thiol coupling to 393
an Au surface various residues on the lumen-exposed face of PSI were replaced by cysteine 394
and tested (Frolov et al 2005) PSI attachment was achieved with all single mutants even 395
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17
those placed further from the P700 site suggesting that a specific location is not required as 396
long as the cysteine is exposed at the luminal surface of PSI The concept of targeted 397
attachment via introduced cysteine residues was exploited in subsequent studies to link PSI to 398
maleimide-functionalized gallium arsenide (Frolov et al 2008) to immobilize PSI between 399
the substrate and a metallized scanning near-field optical microscopy tip (Gerster et al 400
2012) and to bind PSI to carbon nanotubes (Kaniber et al 2010) Another modification of 401
PSI is represented by the attachment of plasmonic metal nanoparticles which resulted in 402
enhanced light absorption (Carmeli et al 2010) even in the green part of the solar spectrum 403
that is not normally absorbed (Szalkowski et al 2017) This suggests that it is possible to 404
enhance light absorption by PSI in vitro through the attachment of abiotic components that 405
act as optical antennae to extend the spectrum of photons available for P700 activation 406
Taken together these efforts demonstrate that PSI-based photocurrent-generating 407
systems are still in an exploratory phase with many variants under development In the next 408
phase viable building blocks and reference systems should be established that can serve as 409
starting points for the systematic engineering of superior systems This will require the 410
modification of PSI for optimal effect in artificial systems and will undoubtedly differ 411
substantially from the original environment in which PSI was molded by biological 412
evolution 413
414
Concluding remarks and outlook 415
Enhancing photosynthesis and growth can be achieved by a simple overexpression of certain 416
photosynthetic proteins and PSI can be coupled to previously unconnected biotic or abiotic 417
components to generate valuable compounds hydrogen or electricity Moreover entire 418
photosynthetic complexes can be functionally expressed in distantly related species (as 419
demonstrated for RuBisCO Aigner et al 2017) Thus what are the next goals and which 420
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18
challenges need to be overcome Two challenges for the in vivo systems are obvious (i) 421
enhancing the efficiency of in-vivo bio-bio hybrids and (ii) upscaling the size of ldquosynthetic 422
photosynthetic modulesrdquo to cover entire photosystems or complex antenna systems 423
With respect to the enhancement of in vivo cyanobacterial and algal systems 424
harboring hybrid configurations in which photosynthesis directly drives previously 425
unconnected pathways the use of laboratory evolution offers a unique opportunity to tailor 426
these systems for their intended purpose Laboratory evolution utilizes the high rate of 427
evolution typical in microbial systems (in particular if suitable selection conditions can be 428
designed) to fine tune and optimize processes through selection of advantageous genetic 429
variation While this strategy has been employed in E coli and yeast with impressive success 430
now photosynthetic microbial systems are emerging as attractive targets for this approach 431
(Leister 2017) 432
The exchange of entire multiprotein complexes between distantly related species will 433
not be a simple exercise because the ldquofrozen metabolic staterdquo of the core photosynthetic 434
complexes will necessitate the exchange of major parts of photosystems rather than 435
individual subunits The RuBisCO case study by Aigner et al (2017) represents of promising 436
proof of principle but one needs to consider that the synthetic RuBisCO module comprised 437
only the two different subunits present in the mature complex and five auxiliary factors for its 438
assembly Entire photosystems will require much larger ldquosynthetic photosynthetic modulesrdquo 439
and many of the auxiliary factors have not been identified yet Therefore when designing 440
these complex ldquosynthetic photosynthetic modulesrdquo we will identify the set of components 441
that are sufficient (and not only necessary) to drive photosynthesis providing an 442
unprecedentedly deep understanding of this fundamental and complex process 443
Given that the problems described above can be solved what will be the next steps in 444
the synthetic biology of the light reactions of photosynthesis The combination of ldquosynthetic 445
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19
photosynthetic modulesrdquo from diverse species could allow the design of novel variants of 446
photosynthesis Numerous instances of such ldquorecombined photosynthetic variantsrdquo can be 447
imagined including plants that employ cyanobacteria-derived phycobilisomes for highly 448
sufficient photosynthesis under low light conditions cyanobacteria that employ plant-derived 449
LHCs as antenna to shift light saturation of photosynthesis to higher intensities or the 450
integration of cyanobacterial Chl d and Chl f (which can absorb far-red and near infra-red 451
light) into algal or plant photosynthesis to expand the spectral region available to drive 452
photosynthesis (Loughlin et al 2013 Ho et al 2016) Moreover such variants of 453
recombined photosynthesis could be further optimized by laboratory evolution within a 454
suitable microbial chassis However such recombined photosynthetic variants cannot be 455
considered a truly novel type of photosynthesis because they would only bring preexisting 456
pieces together that evolution has separated Nevertheless they could be an important step 457
towards the ambitious goal to design truly novel ldquosynthetic photosynthetic modulesrdquo that 458
contain more efficient substitutes of the ldquofrozen metabolic accidentsrdquo discussed above 459
Ample proof of functionality for in-vivo hybrids (between photosynthesis and 460
previously unconnected metabolic pathways) and in-vitro hybrids (between PSI and biotic or 461
abiotic catalysts) has been obtained but such systems will only be commercially successful if 462
they can compete with established non-biological systems Tailoring of PSI in cyanobacteria 463
where techniques like gene replacement and gene modification are routine may contribute to 464
further improving the efficiency and robustness of in vitro and in vivo hybrids One 465
promising route could be to identify those parts of the original PSI (which evolved under 466
constraints imposed by the cyanobacterial cell) that are necessary for hybrid devices (a 467
ldquominimalrdquo PSI) Such bio-nano systems can be optimized to include novel non-biological 468
components that replace or complement natural pigments andor the protein-based backbone 469
of photosystems going far beyond the limited toolbox of Naturersquos chemistry Such novel 470
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20
systems inspired by natural photosynthesis could be used to engage biologists in the design 471
of fundamentally different types of photosynthesis in living organisms 472
473
SUPPLEMENTAL DATA 474
Supplemental Table 1 Absencepresence of photosynthetic proteins in the three model 475
species Synechocystis PCC6803 (Syn) Chlamydomonas reinhardtii (Cr) and Arabidopsis 476
thaliana (At) 477
478
ACKNOWLEDGMENTS 479
The authors thank Paul Hardy for critical reading of the manuscript 480
481
482
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21
Table 1 Replacement of conserved individual or multiple photosynthetic proteins 483
GeneProtein Description Protein
identity
Reference
psbAD1 Synechocystis D1 was replaced by its homolog from
Poa annua which resulted in slower growth This is
likely to be due to increased charge recombination
between the donor and acceptor sides of the reaction
center
86 Nixon et al
1991
psbBCP47 Synechocystis CP47 was replaced by its homolog
from spinach and photoautotrophy was lost
80 Vermaas et
al 1996
psbCCP43 Synechocystis CP43 was replaced by its homolog
from spinach and photoautotrophy was lost
85 Carpenter et
al 1993
psbHPsbH Synechocystis PsbH was replaced by its counterpart
from maize The resulting strain displayed increased
light sensitivity and lower chlorophyll content
78 Chiaramonte
et al 1999
psaAPsaA Synechocystis PsaA was replaced by its equivalent
from A thaliana This resulted in reduced photo-
autotrophical growth and a drastically reduced
ChlPC ratio
80 Viola et al
2014
psbABCDEF
D1CP47CP43D2
Cyt b559-+
All six core subunits of C reinhardtii were replaced
by their counterparts from two different green algae
(V carteri and S obliquus) The resulting strains
were photoautotrophic but showed reduced
photosynthetic efficiency and the heterologous
82 -
99
Gimpel et al
2016
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22
proteins reached only between 10 and 20 of the
levels of those they replaced
484
485
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23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
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24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
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26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
32
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566
Aigner H Wilson RH Bracher A Calisse L Bhat JY Hartl FU Hayer-Hartl M (2017) 567
Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
chloroplast-ferredoxin-hydrogenase system Proc Natl Acad Sci U S A 70 2317-2320 571
Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
complements ferredoxin deficiency in knocked-down transgenic tobacco plants Plant 574
J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
photosynthesis for energy production Curr Opin Chem Biol 17 457-461 577
Burgdorf T Lenz O Buhrke T van der Linden E Jones AK Albracht SP Friedrich B 578
(2005) [NiFe]-hydrogenases of Ralstonia eutropha H16 modular enzymes for 579
oxygen-tolerant biological hydrogen oxidation J Mol Microbiol Biotechnol 10 181-580
96 581
Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
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nanoparticle antennas Nano Lett 10 2069-2074 584
Carpenter SD Ohad I Vermaas WF (1993) Analysis of chimeric spinachcyanobacterial 585
CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
the water-splitting system of Photosystem II Biochim Biophys Acta 1144 204-212 587
Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
Eur J Biochem 260 833-843 593
Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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33
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Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel 601
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Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
by thermal dissipation of excess energy Biochem Soc Trans 38 651-660 608
Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
device by direct chemical binding of the photosynthetic reaction center protein to 610
metal surfaces Advanced Materials 17 2434-2437 611
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13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I 617
Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
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Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
state biophotovoltaic cells containing photosystem I Adv Mater 26 4863-4869 630
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supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
harvesting chlorophyll ab-binding protein in Synechocystis sp PCC 6803 Eur J 643
Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
synthase is a highly divergent paralog of PsbA of photosystem II Science 353 646
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Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
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66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
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c553 minimises charge recombination and enhances photovoltaic performance of the 660
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ACS Chem Biol 6 533-539 663
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Improving photosynthesis and crop productivity by accelerating recovery from 681
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Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
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products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
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Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
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Plant Sci 3 199 694
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Photosynth Res 116 277-293 705
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4148 707
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enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
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Rev Plant Biol 64 609-635 741
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biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
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hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
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phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
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236-248 762
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3619-3639 782
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2189 785
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134-145 788
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Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
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1585-1587 797
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
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Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M 798
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molecular wire Biochim Biophys Acta 1767 653-659 802
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N 803
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tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050 805
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
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U S A 104 11495-11500 809
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photodamage resistance New Phytol 210 1229-1243 813
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Photosynth Res 48 147-162 818
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene 819
replacement in Synechocystis sp PCC 6803 Microb Cell Fact 13 4 820
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
thaliana J Biol Chem 278 31286-31289 826
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M 827
Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
dependent pathways into Synechocystis sp PCC 6803 Metab Eng 33 1-11 830
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40
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in 831
functional photosystem II complexes of cyanobacteria Proc Natl Acad Sci U S A 98 832
14168-14173 833
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) 834
Photosynthetic electron partitioning between [FeFe]-hydrogenase and 835
ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S 836
A 108 9396-9401 837
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of 838
alternative electron flow by flavodiiron proteins in Arabidopsis Nat Plants 2 16012 839
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ 840
(2018) Ectopic expression of SsPETE2 a plastocyanin from Suaeda salsa improves 841
plant tolerance to oxidative stress Plant Sci 268 1-10 842
843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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Shi T Bibby TS Jiang L Irwin AJ Falkowski PG (2005) Protein interactions limit the rate of evolution of photosynthetic genes incyanobacteria Mol Biol Evol 22 2179-2189
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Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS Protein Increases Electron Transport Ratesand Biomass Yield Plant Physiol 175 134-145
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Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J (2017) Plasmon-induced absorption of blindchlorophylls in photosynthetic proteins assembled on silver nanowires Nanoscale 9 10475-10486
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Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T Sakai M Fujii M Tohri A Iwai M Inoue YYoneyama S Minakata M Enami I (2009) Plugging a molecular wire into photosystem I reconstitution of the photoelectric conversionsystem on a gold electrode Angew Chem Int Ed Engl 48 1585-1587
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Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M Iwai M Taguchi S Enami I Inoue Y Yamanoi YYonezawa T Mizuno K Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M (2007) Bio-photosensorCyanobacterial photosystem I coupled with transistor via molecular wire Biochim Biophys Acta 1767 653-659
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Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N (2006) Functional replacement of ferredoxin by acyanobacterial flavodoxin in tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050
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Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR Carrillo N (2007) Enhanced plant tolerance to ironstarvation by functional substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci U S A 104 11495-11500
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Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M Norici A Shotland Y Ohad I Kaplan A (2016) Themechanisms whereby the green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled photodamage resistanceNew Phytol 210 1229-1243
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Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from Photosystem I-catalyst hybrids Curr Opin Chem Biol25 1-8
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Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium Synechocystis sp PCC 6803 carrying spinachsequences Construction and function Photosynth Res 48 147-162
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Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene replacement in Synechocystis sp PCC 6803Microb Cell Fact 13 4
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Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron Protein Substitutes for Cyclic Electron Flow withoutCompeting CO2 Assimilation in Rice Plant Physiol 176 1509-1518
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Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) Plastocyanin is indispensable for photosyntheticelectron flow in Arabidopsis thaliana J Biol Chem 278 31286-31289
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
11
chaperones that are required for the insertion of co-factors (eg pigments into LHCs Schmid 247
2008) and (iii) assembly factors Assembly factors are required to support the stepwise 248
assembly and functionality of the multiproteinpigment complexes and many of these are 249
conserved between photosynthetic species (Nixon et al 2010 Nickelsen and Rengstl 2013 250
Jensen and Leister 2014) Therefore the exchange of entire multiprotein complexes between 251
distantly related species will not be simple due to the repertoire of auxiliary factors that has 252
markedly changed during evolution Since the species that Gimpel et al (2016) studied were 253
closely related this aspect could be neglected In consequence the impact of these auxiliary 254
factors on the formation of multiproteinpigment complexes will have to be fully elucidated 255
to understand which factors are sufficient to assemble a photosynthetic multiprotein complex 256
previous (genetic) approaches only identified factors required for this process Hence the 257
transfer of entire photosynthetic (sub)complexes between distantly related species by a 258
ldquosynthetic photosynthetic modulerdquo must include entire sets of strongly interacting proteins (to 259
address the ldquofrozen metabolic staterdquo) as well as all genetic elements and auxiliary factors 260
sufficient for efficient expression biogenesis and function of the proteins in the module 261
262
Bio-bio hybrids using photosynthesis as an electron source for unrelated biological 263
processes 264
The idea of using the reducing power of photosynthesis to drive unrelated metabolic reactions 265
has inspired several biotechnological concepts The photosynthesis-driven formation of 266
secondary metabolites has been demonstrated in vivo whereas light-driven generation of H2 267
by bio-bio hybrids so far works only in vitro and is closely related to bio-nano approaches 268
Therefore coupling of photosynthesis to previously unrelated pathways is discussed here 269
first followed by bio-bio systems for H2 generation 270
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12
Redirection of PSI reducing equivalents to drive reactions catalyzed by cytochrome 271
P450 enzymes has been achieved in vivo by genetic modifications of plants and 272
cyanobacteria (Lassen et al 2014a Nielsen et al 2016 Mellor et al 2017) Cytochrome 273
P450s constitute the largest family of plant enzymes that acts on various endogenous and 274
xenobiotic molecules (Rasool and Mohamed 2016) Their extreme versatility and 275
irreversibility of catalyzed reactions make these enzymes very attractive for use in 276
biotechnology medicine and phytoremediation P450s are monooxygenases that insert an 277
oxygen atom into hydrophobic molecules which enhances their reactivity and hydrophilicity 278
Most eukaryotic P450s require NADPHcytochrome P450 reductase as the electron donor 279
The ER membrane is generally accepted to be the primary subcellular repository of 280
eukaryotic P450s and their NADPHcytochrome P450 reductase By relocating cytochrome 281
P450s to the chloroplasts the reducing power of photosynthesis can be directly targeted to 282
the reactions catalyzed by these enzymes thus providing the basis for the large-scale 283
production of valuable products Initial attempts to couple P450s with photosynthesis were 284
conducted in vitro (Table 3 Fig 4A) Spinach chloroplasts were combined with microsomes 285
from yeast cells that had been stably transformed with a fusion gene expressing the rat 286
CYP1A1-NADPHcytochrome P450 reductase fusion enzyme (Kim et al 1996) These 287
experiments confirmed that it is feasible to drive P450-mediated reactions using electrons 288
derived from photosynthetically generated NADPH Intriguingly the NADPHcytochrome 289
P450 reductase is not always essential as demonstrated by co-incubating CYP79A1 from 290
sorghum (Sorghum bicolor) with barley (Hordeum vulgare) PSI and employing ferredoxin to 291
directly deliver electrons from PSI to the P450 (Jensen et al 2011) This approach was also 292
shown to be practicable in vivo CYP79A1 either alone or in combination with CYP71E1 293
and the UDP-glucosyltransferase UGT85B1 was first targeted in vivo to cyanobacterial or 294
plant thylakoid membranes where they catalyzed the same reactions as in their original 295
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
13
cellular compartment (the ER) utilizing photosynthetically reduced ferredoxin as the electron 296
donor (Nielsen et al 2013 Lassen et al 2014b Gnanasekaran et al 2016 Wlodarczyk et 297
al 2016) Genetic fusions have also been employed for the coupling of P450s to PSI 298
CYP79A1 has been fused to either cyanobacterial PsaM or Arabidopsis ferredoxin and the 299
engineered enzyme showed light-driven activity both in vivo and in vitro (Lassen et al 300
2014b Mellor et al 2016) In the latter case the efficiency of the system was enhanced 301
because the fusion could compete better with endogenous electron sinks coupled to metabolic 302
pathways (Mellor et al 2016) 303
In contrast to PSI-P450 hybrids PSI-hydrogenase hybrids currently function only in 304
vitro Unlike fossil fuels H2 is environmentally benign as it produces only water when 305
combusted Therefore in principle harnessing of the reducing power of photosynthesis for 306
the direct production of H2 (ie ultimately using sunlight and water) would yield a fully 307
sustainable system of energy generation PSI but not PSII provides a standard midpoint 308
potential that is sufficiently negative to power the reduction of protons to H2 (Utschig et al 309
2015) Hence approaches have been developed to engineer PSI to produce H2 either as 310
replacement or in addition to its natural product NADPH (see Figure 1 in Box 1) by 311
redirecting PSI electrons to a catalytic component This catalytic component can be abiotic or 312
biotic (hydrogenases) The feasibility of coupling H2 generation to photosynthesis was 313
demonstrated 45 years ago by mixing chloroplast preparations with ferredoxin and 314
hydrogenase (Benemann et al 1973) Twenty-five years later hydrogen evolution by direct 315
electron transfer (without ferredoxin) from PSI to hydrogenases was accomplished for the 316
first time (McTavish 1998) 317
Hydrogenases catalyze the reversible interconversion of H2 into protons and electrons 318
and are widespread in nature they occur in bacteria and archaea but also in some eukarya In 319
vivo hydrogenases can mediate photosynthetic H2 production albeit mostly indirectly or 320
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
14
under anaerobic conditions due to their oxygen sensitivity (Ghirardi 2015 Oey et al 2016) 321
Hydrogenases can be classified according to their metal-ion composition eg [NiFe] and 322
[FeFe] hydrogenases (Lubitz et al 2014 Martin and Frymier 2017) [FeFe] hydrogenases 323
preferentially catalyze proton reduction and can evolve H2 at high rates but are extremely 324
sensitive to O2 and are the only type of hydrogenases found in eukaryotic microorganisms 325
[NiFe] hydrogenases are less sensitive to O2 but preferentially oxidize H2 under 326
physiological conditions (Lubitz et al 2014) In vitro both types of hydrogenases have been 327
directly linked to PSI (Table 3 Fig 4B) PSI-[NiFe] hydrogenase complexes have been 328
generated by fusing the hydrogenase genetically to the PsaE protein (Ihara et al 2006a) PSI-329
[FeFe] hydrogenase complexes were obtained by genetically fusing the hydrogenase to 330
ferredoxin (Yacoby et al 2011) or covalently linking the FeS clusters present in the 331
hydrogenase to PSI via a molecular wire (Lubner et al 2010 Lubner et al 2011) 332
Two parameters characterize the efficiency of these in-vitro systems their H2 333
production rate and longevity While low rates of H2 production (in the range from 01 to 10 334
μmol H2mg chlorophyllh) were described for the early chloroplast extract experiments and 335
genetic fusions of PSI to [NiFe] or [FeFe] hydrogenases (McTavish 1998 Ihara et al 2006a 336
Yacoby et al 2011) higher rates of between 2000 and 3000 μmol H2mg chlorophyllh have 337
been achieved with wired PSI-[FeFe] hydrogenase complexes and genetically fused PSI-338
[NiFe] hydrogenase complexes assembled on a gold electrode (Krassen et al 2009 Lubner 339
et al 2011) Few data are available with respect to the longevity of the PSI-hydrogenase 340
systems however a minimum lifetime of 64 days was reported for a wired [FeFe] 341
hydrogenase-PSI complex at room temperature and under ambient illumination (Lubner et 342
al 2010) 343
The future use of hydrogenases in photosynthesis-driven H2 production will strongly 344
depend on whether or not it is possible to overcome the O2 sensitivity of many hydrogenases 345
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15
by for instance employing oxygen-tolerant [NiFe] hydrogenases (Burgdorf et al 2005 346
Schiffels et al 2013) If this is not possible their efficient use in vivo in thylakoids which 347
inevitably generate O2 during linear electron flow will be impossible However as 348
demonstrated with the gold surface system (Krassen et al 2009) the design of novel 349
matrices into which the hybrid system can be incorporated may markedly enhance the 350
efficiency 351
352
Bio-nano hybrids Use of photosynthesis as a source of electrons for non-biological 353
processes 354
From bio-bio hybrids it is only a small step to developing bio-nano hybrids as demonstrated 355
by PSI hybrids that employ abiotic catalysts for photosynthetic hydrogen production instead 356
of hydrogenase In fact abiotic catalysts have the advantage of bypassing the lability of 357
hydrogenases in the presence of oxygen PSI-platinum hybrids have been produced by 358
combining PSI with platinum nanoparticles (either directly or via tethering by nanowires) or 359
platinum nanoclusters (Kargul et al 2012 Fukuzumi 2015 Utschig et al 2015) (Fig 5A 360
Table 4) Current PSI-platinum hybrids are less efficient than the most advanced PSI-361
hydrogenase systems but are extremely robust (Utschig et al 2015) However future 362
widespread usage of the PSI-platinum system will be limited by the high cost of platinum A 363
more economical alternative to precious metals are earth-abundant molecular catalysts 364
However hybrids consisting of PSI and earth-abundant molecular catalysts have a much 365
shorter working life than platinum-based configurations (Utschig et al 2015) likely due to 366
instability of the molecular catalyst 367
PSI-based photocurrent-producing devices constitute another class of photosynthesis-368
derived nano-bio systems (Table 4 Fig 5) In such devices PSI is immobilized onto 369
electrodes Many variants of this concept have been tested such as varying the electrode 370
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
16
materials immobilizationorientation strategies andor artificial redox mediators (Nguyen and 371
Bruce 2014 Janna Olmos and Kargul 2015 Plumereacute and Nowaczyk 2017 Kargul et al 372
2018) PSI must be immobilized on the electrode surface in such a way that electron transfers 373
between the electrodes and the oxidizing (P700) and reducing (FB - the terminal [4Fe-4S] 374
cluster or an intermediate electron transporter) sites of PSI can proceed with the required 375
efficiency Electrons are transferred between the electrodes and the oxidizing or reducing 376
sides of PSI either by a diffusible redox mediator or molecular wires Examples of electrode 377
materials and redox mediators are provided in Table 4 After P700 photo-excitation electrons 378
are transferred from P700 via several factors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB) to the 379
iron-sulfur cluster FB (see legend of Box 1) As in the case of PSI-hydrogenase and PSI-380
platinum nanoparticles PSI can be wired to its electrodes This has been achieved by wiring 381
the A1 cofactor (phylloquinone) to the substrate surface such that electrons are directly 382
transferred from A1 to the electrode thus bypassing the downstream FeS clusters (FX FA FB) 383
in the stromal domain of PSI (Terasaki et al 2007 Miyachi et al 2009 Terasaki et al 384
2009 Miyachi et al 2010) 385
Modifications of PSI have been utilized to enhance the efficiency of the photocurrent-386
generating system (Das et al 2004 Frolov et al 2005 Carmeli et al 2010) As mentioned 387
previously fusions to the stroma-faced PSI subunit PsaE can be used to link new components 388
to PSI however in this case PsaD fusions were used To this end recombinant His-tagged 389
PsaD was immobilized on the functionalized electrode surface which was then exposed to 390
native PSI complexes resulting in immobilized PSI with P700 facing away from the 391
electrode (Das et al 2004) Another way to control the orientation of PSI during 392
immobilization involves introducing cysteine mutations To allow for direct thiol coupling to 393
an Au surface various residues on the lumen-exposed face of PSI were replaced by cysteine 394
and tested (Frolov et al 2005) PSI attachment was achieved with all single mutants even 395
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17
those placed further from the P700 site suggesting that a specific location is not required as 396
long as the cysteine is exposed at the luminal surface of PSI The concept of targeted 397
attachment via introduced cysteine residues was exploited in subsequent studies to link PSI to 398
maleimide-functionalized gallium arsenide (Frolov et al 2008) to immobilize PSI between 399
the substrate and a metallized scanning near-field optical microscopy tip (Gerster et al 400
2012) and to bind PSI to carbon nanotubes (Kaniber et al 2010) Another modification of 401
PSI is represented by the attachment of plasmonic metal nanoparticles which resulted in 402
enhanced light absorption (Carmeli et al 2010) even in the green part of the solar spectrum 403
that is not normally absorbed (Szalkowski et al 2017) This suggests that it is possible to 404
enhance light absorption by PSI in vitro through the attachment of abiotic components that 405
act as optical antennae to extend the spectrum of photons available for P700 activation 406
Taken together these efforts demonstrate that PSI-based photocurrent-generating 407
systems are still in an exploratory phase with many variants under development In the next 408
phase viable building blocks and reference systems should be established that can serve as 409
starting points for the systematic engineering of superior systems This will require the 410
modification of PSI for optimal effect in artificial systems and will undoubtedly differ 411
substantially from the original environment in which PSI was molded by biological 412
evolution 413
414
Concluding remarks and outlook 415
Enhancing photosynthesis and growth can be achieved by a simple overexpression of certain 416
photosynthetic proteins and PSI can be coupled to previously unconnected biotic or abiotic 417
components to generate valuable compounds hydrogen or electricity Moreover entire 418
photosynthetic complexes can be functionally expressed in distantly related species (as 419
demonstrated for RuBisCO Aigner et al 2017) Thus what are the next goals and which 420
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18
challenges need to be overcome Two challenges for the in vivo systems are obvious (i) 421
enhancing the efficiency of in-vivo bio-bio hybrids and (ii) upscaling the size of ldquosynthetic 422
photosynthetic modulesrdquo to cover entire photosystems or complex antenna systems 423
With respect to the enhancement of in vivo cyanobacterial and algal systems 424
harboring hybrid configurations in which photosynthesis directly drives previously 425
unconnected pathways the use of laboratory evolution offers a unique opportunity to tailor 426
these systems for their intended purpose Laboratory evolution utilizes the high rate of 427
evolution typical in microbial systems (in particular if suitable selection conditions can be 428
designed) to fine tune and optimize processes through selection of advantageous genetic 429
variation While this strategy has been employed in E coli and yeast with impressive success 430
now photosynthetic microbial systems are emerging as attractive targets for this approach 431
(Leister 2017) 432
The exchange of entire multiprotein complexes between distantly related species will 433
not be a simple exercise because the ldquofrozen metabolic staterdquo of the core photosynthetic 434
complexes will necessitate the exchange of major parts of photosystems rather than 435
individual subunits The RuBisCO case study by Aigner et al (2017) represents of promising 436
proof of principle but one needs to consider that the synthetic RuBisCO module comprised 437
only the two different subunits present in the mature complex and five auxiliary factors for its 438
assembly Entire photosystems will require much larger ldquosynthetic photosynthetic modulesrdquo 439
and many of the auxiliary factors have not been identified yet Therefore when designing 440
these complex ldquosynthetic photosynthetic modulesrdquo we will identify the set of components 441
that are sufficient (and not only necessary) to drive photosynthesis providing an 442
unprecedentedly deep understanding of this fundamental and complex process 443
Given that the problems described above can be solved what will be the next steps in 444
the synthetic biology of the light reactions of photosynthesis The combination of ldquosynthetic 445
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19
photosynthetic modulesrdquo from diverse species could allow the design of novel variants of 446
photosynthesis Numerous instances of such ldquorecombined photosynthetic variantsrdquo can be 447
imagined including plants that employ cyanobacteria-derived phycobilisomes for highly 448
sufficient photosynthesis under low light conditions cyanobacteria that employ plant-derived 449
LHCs as antenna to shift light saturation of photosynthesis to higher intensities or the 450
integration of cyanobacterial Chl d and Chl f (which can absorb far-red and near infra-red 451
light) into algal or plant photosynthesis to expand the spectral region available to drive 452
photosynthesis (Loughlin et al 2013 Ho et al 2016) Moreover such variants of 453
recombined photosynthesis could be further optimized by laboratory evolution within a 454
suitable microbial chassis However such recombined photosynthetic variants cannot be 455
considered a truly novel type of photosynthesis because they would only bring preexisting 456
pieces together that evolution has separated Nevertheless they could be an important step 457
towards the ambitious goal to design truly novel ldquosynthetic photosynthetic modulesrdquo that 458
contain more efficient substitutes of the ldquofrozen metabolic accidentsrdquo discussed above 459
Ample proof of functionality for in-vivo hybrids (between photosynthesis and 460
previously unconnected metabolic pathways) and in-vitro hybrids (between PSI and biotic or 461
abiotic catalysts) has been obtained but such systems will only be commercially successful if 462
they can compete with established non-biological systems Tailoring of PSI in cyanobacteria 463
where techniques like gene replacement and gene modification are routine may contribute to 464
further improving the efficiency and robustness of in vitro and in vivo hybrids One 465
promising route could be to identify those parts of the original PSI (which evolved under 466
constraints imposed by the cyanobacterial cell) that are necessary for hybrid devices (a 467
ldquominimalrdquo PSI) Such bio-nano systems can be optimized to include novel non-biological 468
components that replace or complement natural pigments andor the protein-based backbone 469
of photosystems going far beyond the limited toolbox of Naturersquos chemistry Such novel 470
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20
systems inspired by natural photosynthesis could be used to engage biologists in the design 471
of fundamentally different types of photosynthesis in living organisms 472
473
SUPPLEMENTAL DATA 474
Supplemental Table 1 Absencepresence of photosynthetic proteins in the three model 475
species Synechocystis PCC6803 (Syn) Chlamydomonas reinhardtii (Cr) and Arabidopsis 476
thaliana (At) 477
478
ACKNOWLEDGMENTS 479
The authors thank Paul Hardy for critical reading of the manuscript 480
481
482
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21
Table 1 Replacement of conserved individual or multiple photosynthetic proteins 483
GeneProtein Description Protein
identity
Reference
psbAD1 Synechocystis D1 was replaced by its homolog from
Poa annua which resulted in slower growth This is
likely to be due to increased charge recombination
between the donor and acceptor sides of the reaction
center
86 Nixon et al
1991
psbBCP47 Synechocystis CP47 was replaced by its homolog
from spinach and photoautotrophy was lost
80 Vermaas et
al 1996
psbCCP43 Synechocystis CP43 was replaced by its homolog
from spinach and photoautotrophy was lost
85 Carpenter et
al 1993
psbHPsbH Synechocystis PsbH was replaced by its counterpart
from maize The resulting strain displayed increased
light sensitivity and lower chlorophyll content
78 Chiaramonte
et al 1999
psaAPsaA Synechocystis PsaA was replaced by its equivalent
from A thaliana This resulted in reduced photo-
autotrophical growth and a drastically reduced
ChlPC ratio
80 Viola et al
2014
psbABCDEF
D1CP47CP43D2
Cyt b559-+
All six core subunits of C reinhardtii were replaced
by their counterparts from two different green algae
(V carteri and S obliquus) The resulting strains
were photoautotrophic but showed reduced
photosynthetic efficiency and the heterologous
82 -
99
Gimpel et al
2016
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22
proteins reached only between 10 and 20 of the
levels of those they replaced
484
485
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
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24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
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26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
32
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566
Aigner H Wilson RH Bracher A Calisse L Bhat JY Hartl FU Hayer-Hartl M (2017) 567
Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
chloroplast-ferredoxin-hydrogenase system Proc Natl Acad Sci U S A 70 2317-2320 571
Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
complements ferredoxin deficiency in knocked-down transgenic tobacco plants Plant 574
J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
photosynthesis for energy production Curr Opin Chem Biol 17 457-461 577
Burgdorf T Lenz O Buhrke T van der Linden E Jones AK Albracht SP Friedrich B 578
(2005) [NiFe]-hydrogenases of Ralstonia eutropha H16 modular enzymes for 579
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96 581
Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
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nanoparticle antennas Nano Lett 10 2069-2074 584
Carpenter SD Ohad I Vermaas WF (1993) Analysis of chimeric spinachcyanobacterial 585
CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
the water-splitting system of Photosystem II Biochim Biophys Acta 1144 204-212 587
Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
Eur J Biochem 260 833-843 593
Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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33
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Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel 601
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Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
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Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
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13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
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Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
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Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
state biophotovoltaic cells containing photosystem I Adv Mater 26 4863-4869 630
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supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
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Biochem 263 561-570 644
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66 37-44 657
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Plant Sci 3 199 694
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Photosynth Res 116 277-293 705
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enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
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Rev Plant Biol 64 609-635 741
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hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
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phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
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134-145 788
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1585-1587 797
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
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Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
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Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in 831
functional photosystem II complexes of cyanobacteria Proc Natl Acad Sci U S A 98 832
14168-14173 833
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) 834
Photosynthetic electron partitioning between [FeFe]-hydrogenase and 835
ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S 836
A 108 9396-9401 837
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of 838
alternative electron flow by flavodiiron proteins in Arabidopsis Nat Plants 2 16012 839
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ 840
(2018) Ectopic expression of SsPETE2 a plastocyanin from Suaeda salsa improves 841
plant tolerance to oxidative stress Plant Sci 268 1-10 842
843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M Iwai M Taguchi S Enami I Inoue Y Yamanoi YYonezawa T Mizuno K Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M (2007) Bio-photosensorCyanobacterial photosystem I coupled with transistor via molecular wire Biochim Biophys Acta 1767 653-659
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Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N (2006) Functional replacement of ferredoxin by acyanobacterial flavodoxin in tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050
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Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR Carrillo N (2007) Enhanced plant tolerance to ironstarvation by functional substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci U S A 104 11495-11500
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Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M Norici A Shotland Y Ohad I Kaplan A (2016) Themechanisms whereby the green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled photodamage resistanceNew Phytol 210 1229-1243
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Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from Photosystem I-catalyst hybrids Curr Opin Chem Biol25 1-8
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium Synechocystis sp PCC 6803 carrying spinachsequences Construction and function Photosynth Res 48 147-162
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Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene replacement in Synechocystis sp PCC 6803Microb Cell Fact 13 4
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Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron Protein Substitutes for Cyclic Electron Flow withoutCompeting CO2 Assimilation in Rice Plant Physiol 176 1509-1518
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Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) Plastocyanin is indispensable for photosyntheticelectron flow in Arabidopsis thaliana J Biol Chem 278 31286-31289
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M Thofner JF Olsen CE Mottawie MS Burow M Pribil MFeussner I Moller BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 dependent pathways intoSynechocystis sp PCC 6803 Metab Eng 33 1-11
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Google Scholar Author Only Title Only Author and Title
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in functional photosystem II complexes ofcyanobacteria Proc Natl Acad Sci U S A 98 14168-14173
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Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) Photosynthetic electron partitioning between [FeFe]-hydrogenase and ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S A 108 9396-9401
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Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of alternative electron flow by flavodiiron proteins inArabidopsis Nat Plants 2 16012
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
12
Redirection of PSI reducing equivalents to drive reactions catalyzed by cytochrome 271
P450 enzymes has been achieved in vivo by genetic modifications of plants and 272
cyanobacteria (Lassen et al 2014a Nielsen et al 2016 Mellor et al 2017) Cytochrome 273
P450s constitute the largest family of plant enzymes that acts on various endogenous and 274
xenobiotic molecules (Rasool and Mohamed 2016) Their extreme versatility and 275
irreversibility of catalyzed reactions make these enzymes very attractive for use in 276
biotechnology medicine and phytoremediation P450s are monooxygenases that insert an 277
oxygen atom into hydrophobic molecules which enhances their reactivity and hydrophilicity 278
Most eukaryotic P450s require NADPHcytochrome P450 reductase as the electron donor 279
The ER membrane is generally accepted to be the primary subcellular repository of 280
eukaryotic P450s and their NADPHcytochrome P450 reductase By relocating cytochrome 281
P450s to the chloroplasts the reducing power of photosynthesis can be directly targeted to 282
the reactions catalyzed by these enzymes thus providing the basis for the large-scale 283
production of valuable products Initial attempts to couple P450s with photosynthesis were 284
conducted in vitro (Table 3 Fig 4A) Spinach chloroplasts were combined with microsomes 285
from yeast cells that had been stably transformed with a fusion gene expressing the rat 286
CYP1A1-NADPHcytochrome P450 reductase fusion enzyme (Kim et al 1996) These 287
experiments confirmed that it is feasible to drive P450-mediated reactions using electrons 288
derived from photosynthetically generated NADPH Intriguingly the NADPHcytochrome 289
P450 reductase is not always essential as demonstrated by co-incubating CYP79A1 from 290
sorghum (Sorghum bicolor) with barley (Hordeum vulgare) PSI and employing ferredoxin to 291
directly deliver electrons from PSI to the P450 (Jensen et al 2011) This approach was also 292
shown to be practicable in vivo CYP79A1 either alone or in combination with CYP71E1 293
and the UDP-glucosyltransferase UGT85B1 was first targeted in vivo to cyanobacterial or 294
plant thylakoid membranes where they catalyzed the same reactions as in their original 295
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13
cellular compartment (the ER) utilizing photosynthetically reduced ferredoxin as the electron 296
donor (Nielsen et al 2013 Lassen et al 2014b Gnanasekaran et al 2016 Wlodarczyk et 297
al 2016) Genetic fusions have also been employed for the coupling of P450s to PSI 298
CYP79A1 has been fused to either cyanobacterial PsaM or Arabidopsis ferredoxin and the 299
engineered enzyme showed light-driven activity both in vivo and in vitro (Lassen et al 300
2014b Mellor et al 2016) In the latter case the efficiency of the system was enhanced 301
because the fusion could compete better with endogenous electron sinks coupled to metabolic 302
pathways (Mellor et al 2016) 303
In contrast to PSI-P450 hybrids PSI-hydrogenase hybrids currently function only in 304
vitro Unlike fossil fuels H2 is environmentally benign as it produces only water when 305
combusted Therefore in principle harnessing of the reducing power of photosynthesis for 306
the direct production of H2 (ie ultimately using sunlight and water) would yield a fully 307
sustainable system of energy generation PSI but not PSII provides a standard midpoint 308
potential that is sufficiently negative to power the reduction of protons to H2 (Utschig et al 309
2015) Hence approaches have been developed to engineer PSI to produce H2 either as 310
replacement or in addition to its natural product NADPH (see Figure 1 in Box 1) by 311
redirecting PSI electrons to a catalytic component This catalytic component can be abiotic or 312
biotic (hydrogenases) The feasibility of coupling H2 generation to photosynthesis was 313
demonstrated 45 years ago by mixing chloroplast preparations with ferredoxin and 314
hydrogenase (Benemann et al 1973) Twenty-five years later hydrogen evolution by direct 315
electron transfer (without ferredoxin) from PSI to hydrogenases was accomplished for the 316
first time (McTavish 1998) 317
Hydrogenases catalyze the reversible interconversion of H2 into protons and electrons 318
and are widespread in nature they occur in bacteria and archaea but also in some eukarya In 319
vivo hydrogenases can mediate photosynthetic H2 production albeit mostly indirectly or 320
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14
under anaerobic conditions due to their oxygen sensitivity (Ghirardi 2015 Oey et al 2016) 321
Hydrogenases can be classified according to their metal-ion composition eg [NiFe] and 322
[FeFe] hydrogenases (Lubitz et al 2014 Martin and Frymier 2017) [FeFe] hydrogenases 323
preferentially catalyze proton reduction and can evolve H2 at high rates but are extremely 324
sensitive to O2 and are the only type of hydrogenases found in eukaryotic microorganisms 325
[NiFe] hydrogenases are less sensitive to O2 but preferentially oxidize H2 under 326
physiological conditions (Lubitz et al 2014) In vitro both types of hydrogenases have been 327
directly linked to PSI (Table 3 Fig 4B) PSI-[NiFe] hydrogenase complexes have been 328
generated by fusing the hydrogenase genetically to the PsaE protein (Ihara et al 2006a) PSI-329
[FeFe] hydrogenase complexes were obtained by genetically fusing the hydrogenase to 330
ferredoxin (Yacoby et al 2011) or covalently linking the FeS clusters present in the 331
hydrogenase to PSI via a molecular wire (Lubner et al 2010 Lubner et al 2011) 332
Two parameters characterize the efficiency of these in-vitro systems their H2 333
production rate and longevity While low rates of H2 production (in the range from 01 to 10 334
μmol H2mg chlorophyllh) were described for the early chloroplast extract experiments and 335
genetic fusions of PSI to [NiFe] or [FeFe] hydrogenases (McTavish 1998 Ihara et al 2006a 336
Yacoby et al 2011) higher rates of between 2000 and 3000 μmol H2mg chlorophyllh have 337
been achieved with wired PSI-[FeFe] hydrogenase complexes and genetically fused PSI-338
[NiFe] hydrogenase complexes assembled on a gold electrode (Krassen et al 2009 Lubner 339
et al 2011) Few data are available with respect to the longevity of the PSI-hydrogenase 340
systems however a minimum lifetime of 64 days was reported for a wired [FeFe] 341
hydrogenase-PSI complex at room temperature and under ambient illumination (Lubner et 342
al 2010) 343
The future use of hydrogenases in photosynthesis-driven H2 production will strongly 344
depend on whether or not it is possible to overcome the O2 sensitivity of many hydrogenases 345
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15
by for instance employing oxygen-tolerant [NiFe] hydrogenases (Burgdorf et al 2005 346
Schiffels et al 2013) If this is not possible their efficient use in vivo in thylakoids which 347
inevitably generate O2 during linear electron flow will be impossible However as 348
demonstrated with the gold surface system (Krassen et al 2009) the design of novel 349
matrices into which the hybrid system can be incorporated may markedly enhance the 350
efficiency 351
352
Bio-nano hybrids Use of photosynthesis as a source of electrons for non-biological 353
processes 354
From bio-bio hybrids it is only a small step to developing bio-nano hybrids as demonstrated 355
by PSI hybrids that employ abiotic catalysts for photosynthetic hydrogen production instead 356
of hydrogenase In fact abiotic catalysts have the advantage of bypassing the lability of 357
hydrogenases in the presence of oxygen PSI-platinum hybrids have been produced by 358
combining PSI with platinum nanoparticles (either directly or via tethering by nanowires) or 359
platinum nanoclusters (Kargul et al 2012 Fukuzumi 2015 Utschig et al 2015) (Fig 5A 360
Table 4) Current PSI-platinum hybrids are less efficient than the most advanced PSI-361
hydrogenase systems but are extremely robust (Utschig et al 2015) However future 362
widespread usage of the PSI-platinum system will be limited by the high cost of platinum A 363
more economical alternative to precious metals are earth-abundant molecular catalysts 364
However hybrids consisting of PSI and earth-abundant molecular catalysts have a much 365
shorter working life than platinum-based configurations (Utschig et al 2015) likely due to 366
instability of the molecular catalyst 367
PSI-based photocurrent-producing devices constitute another class of photosynthesis-368
derived nano-bio systems (Table 4 Fig 5) In such devices PSI is immobilized onto 369
electrodes Many variants of this concept have been tested such as varying the electrode 370
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16
materials immobilizationorientation strategies andor artificial redox mediators (Nguyen and 371
Bruce 2014 Janna Olmos and Kargul 2015 Plumereacute and Nowaczyk 2017 Kargul et al 372
2018) PSI must be immobilized on the electrode surface in such a way that electron transfers 373
between the electrodes and the oxidizing (P700) and reducing (FB - the terminal [4Fe-4S] 374
cluster or an intermediate electron transporter) sites of PSI can proceed with the required 375
efficiency Electrons are transferred between the electrodes and the oxidizing or reducing 376
sides of PSI either by a diffusible redox mediator or molecular wires Examples of electrode 377
materials and redox mediators are provided in Table 4 After P700 photo-excitation electrons 378
are transferred from P700 via several factors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB) to the 379
iron-sulfur cluster FB (see legend of Box 1) As in the case of PSI-hydrogenase and PSI-380
platinum nanoparticles PSI can be wired to its electrodes This has been achieved by wiring 381
the A1 cofactor (phylloquinone) to the substrate surface such that electrons are directly 382
transferred from A1 to the electrode thus bypassing the downstream FeS clusters (FX FA FB) 383
in the stromal domain of PSI (Terasaki et al 2007 Miyachi et al 2009 Terasaki et al 384
2009 Miyachi et al 2010) 385
Modifications of PSI have been utilized to enhance the efficiency of the photocurrent-386
generating system (Das et al 2004 Frolov et al 2005 Carmeli et al 2010) As mentioned 387
previously fusions to the stroma-faced PSI subunit PsaE can be used to link new components 388
to PSI however in this case PsaD fusions were used To this end recombinant His-tagged 389
PsaD was immobilized on the functionalized electrode surface which was then exposed to 390
native PSI complexes resulting in immobilized PSI with P700 facing away from the 391
electrode (Das et al 2004) Another way to control the orientation of PSI during 392
immobilization involves introducing cysteine mutations To allow for direct thiol coupling to 393
an Au surface various residues on the lumen-exposed face of PSI were replaced by cysteine 394
and tested (Frolov et al 2005) PSI attachment was achieved with all single mutants even 395
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17
those placed further from the P700 site suggesting that a specific location is not required as 396
long as the cysteine is exposed at the luminal surface of PSI The concept of targeted 397
attachment via introduced cysteine residues was exploited in subsequent studies to link PSI to 398
maleimide-functionalized gallium arsenide (Frolov et al 2008) to immobilize PSI between 399
the substrate and a metallized scanning near-field optical microscopy tip (Gerster et al 400
2012) and to bind PSI to carbon nanotubes (Kaniber et al 2010) Another modification of 401
PSI is represented by the attachment of plasmonic metal nanoparticles which resulted in 402
enhanced light absorption (Carmeli et al 2010) even in the green part of the solar spectrum 403
that is not normally absorbed (Szalkowski et al 2017) This suggests that it is possible to 404
enhance light absorption by PSI in vitro through the attachment of abiotic components that 405
act as optical antennae to extend the spectrum of photons available for P700 activation 406
Taken together these efforts demonstrate that PSI-based photocurrent-generating 407
systems are still in an exploratory phase with many variants under development In the next 408
phase viable building blocks and reference systems should be established that can serve as 409
starting points for the systematic engineering of superior systems This will require the 410
modification of PSI for optimal effect in artificial systems and will undoubtedly differ 411
substantially from the original environment in which PSI was molded by biological 412
evolution 413
414
Concluding remarks and outlook 415
Enhancing photosynthesis and growth can be achieved by a simple overexpression of certain 416
photosynthetic proteins and PSI can be coupled to previously unconnected biotic or abiotic 417
components to generate valuable compounds hydrogen or electricity Moreover entire 418
photosynthetic complexes can be functionally expressed in distantly related species (as 419
demonstrated for RuBisCO Aigner et al 2017) Thus what are the next goals and which 420
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18
challenges need to be overcome Two challenges for the in vivo systems are obvious (i) 421
enhancing the efficiency of in-vivo bio-bio hybrids and (ii) upscaling the size of ldquosynthetic 422
photosynthetic modulesrdquo to cover entire photosystems or complex antenna systems 423
With respect to the enhancement of in vivo cyanobacterial and algal systems 424
harboring hybrid configurations in which photosynthesis directly drives previously 425
unconnected pathways the use of laboratory evolution offers a unique opportunity to tailor 426
these systems for their intended purpose Laboratory evolution utilizes the high rate of 427
evolution typical in microbial systems (in particular if suitable selection conditions can be 428
designed) to fine tune and optimize processes through selection of advantageous genetic 429
variation While this strategy has been employed in E coli and yeast with impressive success 430
now photosynthetic microbial systems are emerging as attractive targets for this approach 431
(Leister 2017) 432
The exchange of entire multiprotein complexes between distantly related species will 433
not be a simple exercise because the ldquofrozen metabolic staterdquo of the core photosynthetic 434
complexes will necessitate the exchange of major parts of photosystems rather than 435
individual subunits The RuBisCO case study by Aigner et al (2017) represents of promising 436
proof of principle but one needs to consider that the synthetic RuBisCO module comprised 437
only the two different subunits present in the mature complex and five auxiliary factors for its 438
assembly Entire photosystems will require much larger ldquosynthetic photosynthetic modulesrdquo 439
and many of the auxiliary factors have not been identified yet Therefore when designing 440
these complex ldquosynthetic photosynthetic modulesrdquo we will identify the set of components 441
that are sufficient (and not only necessary) to drive photosynthesis providing an 442
unprecedentedly deep understanding of this fundamental and complex process 443
Given that the problems described above can be solved what will be the next steps in 444
the synthetic biology of the light reactions of photosynthesis The combination of ldquosynthetic 445
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19
photosynthetic modulesrdquo from diverse species could allow the design of novel variants of 446
photosynthesis Numerous instances of such ldquorecombined photosynthetic variantsrdquo can be 447
imagined including plants that employ cyanobacteria-derived phycobilisomes for highly 448
sufficient photosynthesis under low light conditions cyanobacteria that employ plant-derived 449
LHCs as antenna to shift light saturation of photosynthesis to higher intensities or the 450
integration of cyanobacterial Chl d and Chl f (which can absorb far-red and near infra-red 451
light) into algal or plant photosynthesis to expand the spectral region available to drive 452
photosynthesis (Loughlin et al 2013 Ho et al 2016) Moreover such variants of 453
recombined photosynthesis could be further optimized by laboratory evolution within a 454
suitable microbial chassis However such recombined photosynthetic variants cannot be 455
considered a truly novel type of photosynthesis because they would only bring preexisting 456
pieces together that evolution has separated Nevertheless they could be an important step 457
towards the ambitious goal to design truly novel ldquosynthetic photosynthetic modulesrdquo that 458
contain more efficient substitutes of the ldquofrozen metabolic accidentsrdquo discussed above 459
Ample proof of functionality for in-vivo hybrids (between photosynthesis and 460
previously unconnected metabolic pathways) and in-vitro hybrids (between PSI and biotic or 461
abiotic catalysts) has been obtained but such systems will only be commercially successful if 462
they can compete with established non-biological systems Tailoring of PSI in cyanobacteria 463
where techniques like gene replacement and gene modification are routine may contribute to 464
further improving the efficiency and robustness of in vitro and in vivo hybrids One 465
promising route could be to identify those parts of the original PSI (which evolved under 466
constraints imposed by the cyanobacterial cell) that are necessary for hybrid devices (a 467
ldquominimalrdquo PSI) Such bio-nano systems can be optimized to include novel non-biological 468
components that replace or complement natural pigments andor the protein-based backbone 469
of photosystems going far beyond the limited toolbox of Naturersquos chemistry Such novel 470
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20
systems inspired by natural photosynthesis could be used to engage biologists in the design 471
of fundamentally different types of photosynthesis in living organisms 472
473
SUPPLEMENTAL DATA 474
Supplemental Table 1 Absencepresence of photosynthetic proteins in the three model 475
species Synechocystis PCC6803 (Syn) Chlamydomonas reinhardtii (Cr) and Arabidopsis 476
thaliana (At) 477
478
ACKNOWLEDGMENTS 479
The authors thank Paul Hardy for critical reading of the manuscript 480
481
482
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21
Table 1 Replacement of conserved individual or multiple photosynthetic proteins 483
GeneProtein Description Protein
identity
Reference
psbAD1 Synechocystis D1 was replaced by its homolog from
Poa annua which resulted in slower growth This is
likely to be due to increased charge recombination
between the donor and acceptor sides of the reaction
center
86 Nixon et al
1991
psbBCP47 Synechocystis CP47 was replaced by its homolog
from spinach and photoautotrophy was lost
80 Vermaas et
al 1996
psbCCP43 Synechocystis CP43 was replaced by its homolog
from spinach and photoautotrophy was lost
85 Carpenter et
al 1993
psbHPsbH Synechocystis PsbH was replaced by its counterpart
from maize The resulting strain displayed increased
light sensitivity and lower chlorophyll content
78 Chiaramonte
et al 1999
psaAPsaA Synechocystis PsaA was replaced by its equivalent
from A thaliana This resulted in reduced photo-
autotrophical growth and a drastically reduced
ChlPC ratio
80 Viola et al
2014
psbABCDEF
D1CP47CP43D2
Cyt b559-+
All six core subunits of C reinhardtii were replaced
by their counterparts from two different green algae
(V carteri and S obliquus) The resulting strains
were photoautotrophic but showed reduced
photosynthetic efficiency and the heterologous
82 -
99
Gimpel et al
2016
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22
proteins reached only between 10 and 20 of the
levels of those they replaced
484
485
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23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
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24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
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26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
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28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
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32
References 565
566
Aigner H Wilson RH Bracher A Calisse L Bhat JY Hartl FU Hayer-Hartl M (2017) 567
Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
chloroplast-ferredoxin-hydrogenase system Proc Natl Acad Sci U S A 70 2317-2320 571
Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
complements ferredoxin deficiency in knocked-down transgenic tobacco plants Plant 574
J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
photosynthesis for energy production Curr Opin Chem Biol 17 457-461 577
Burgdorf T Lenz O Buhrke T van der Linden E Jones AK Albracht SP Friedrich B 578
(2005) [NiFe]-hydrogenases of Ralstonia eutropha H16 modular enzymes for 579
oxygen-tolerant biological hydrogen oxidation J Mol Microbiol Biotechnol 10 181-580
96 581
Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
(2010) Broad band enhancement of light absorption in photosystem I by metal 583
nanoparticle antennas Nano Lett 10 2069-2074 584
Carpenter SD Ohad I Vermaas WF (1993) Analysis of chimeric spinachcyanobacterial 585
CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
the water-splitting system of Photosystem II Biochim Biophys Acta 1144 204-212 587
Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
Eur J Biochem 260 833-843 593
Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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33
Ciornii D Riedel M Stieger KR Feifel SC Hejazi M Lokstein H Zouni A Lisdat F 598
(2017) Bioelectronic Circuit on a 3D Electrode Architecture Enzymatic Catalysis 599
Interconnected with Photosystem I J Am Chem Soc 139 16478-16481 600
Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel 601
genetic diversity Philos Trans R Soc Lond B Biol Sci 372 602
Das R Kiley PJ Segal M Norville J Yu AA Wang L Trammell SA Reddick LE 603
Kumar R Stellacci F Lebedev N Schnur J Bruce BD Zhang S Baldo M (2004) 604
Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
by thermal dissipation of excess energy Biochem Soc Trans 38 651-660 608
Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
device by direct chemical binding of the photosynthetic reaction center protein to 610
metal surfaces Advanced Materials 17 2434-2437 611
Frolov L Rosenwaks Y Richter S Carmeli C Carmeli I (2008) Photoelectric junctions 612
between GaAs and photosynthetic reaction center protein J Phys Chem C 112 613
13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I 617
Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
reinhardtii ACS Synth Biol 5 589-596 624
Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
state biophotovoltaic cells containing photosystem I Adv Mater 26 4863-4869 630
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Glowacka K Kromdijk J Kucera K Xie J Cavanagh AP Leonelli L Leakey ADB Ort 631
DR Niyogi KK Long SP (2018) Photosystem II subunit S overexpression increases 632
the efficiency of water use in a field-grown crop Nat Commun 9 868 633
Gnanasekaran T Karcher D Nielsen AZ Martens HJ Ruf S Kroop X Olsen CE 634
Motawie MS Pribil M Moller BL Bock R Jensen PE (2016) Transfer of the 635
cytochrome P450-dependent dhurrin pathway from Sorghum bicolor into Nicotiana 636
tabacum chloroplasts for light-driven synthesis J Exp Bot 67 2495-2506 637
Haniewicz P Abram M Nosek L Kirkpatrick J El-Mohsnawy E Olmos JDJ Kouřil 638
R Kargul JM (2018) Molecular mechanisms of photoadaptation of photosystem I 639
supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
harvesting chlorophyll ab-binding protein in Synechocystis sp PCC 6803 Eur J 643
Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
synthase is a highly divergent paralog of PsbA of photosystem II Science 353 646
Holt NE Fleming GR Niyogi KK (2004) Toward an understanding of the mechanism of 647
nonphotochemical quenching in green plants Biochemistry 43 8281-8289 648
Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
D Kamachi T Okura I (2006a) Light-driven hydrogen production by a hybrid 650
complex of a [NiFe]-hydrogenase and the cyanobacterial photosystem I Photochem 651
Photobiol 82 676-682 652
Ihara M Nakamoto H Kamachi T Okura I Maeda M (2006b) Photoinduced hydrogen 653
production by direct electron transfer from photosystem I cross-linked with 654
cytochrome c3 to [NiFe]-hydrogenase Photochem Photobiol 82 1677-1685Janna 655
Olmos JD Kargul J (2015) A quest for the artificial leaf Int J Biochem Cell Biol 656
66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
Pawlak D Kargul J (2017) Biofunctionalisation of p-doped silicon with cytochrome 659
c553 minimises charge recombination and enhances photovoltaic performance of the 660
all-solid-state photosystem I-based biophotoelectrode RSC Adv 7 47854-47866 661
Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations 662
ACS Chem Biol 6 533-539 663
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35
Jensen PE Leister D (2014) Chloroplast evolution structure and functions F1000Prime 664
Rep 6 40 665
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip 666
functionalization of carbon nanotubes with photosystem I J Am Chem Soc 132 667
2872-2873 668
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and 669
its application in biomimetic solar-to-fuel systems J Plant Physiol 169 1639-1653 670
Kargul J Bubak G Andryianau G (2018) Biophotovoltaic systems based on 671
photosynthetic complexes In Wandelt K (Ed) Encyclopedia of Interfacial 672
Chemistry Surface Science and Electrochemistry vol 7 pp 43-63 673
Kim YS Hara M Ikebukuro K Miyake J Ohkawa H Karube I (1996) Photo-induced 674
activation of cytochrome P450reductase fusion enzyme coupled with spinach 675
chloroplasts Biotechnol Tech 10 717minus720 676
Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic 677
hydrogen production by a hybrid complex of photosystem I and [NiFe]-hydrogenase 678
ACS Nano 3 4055-4061 679
Kromdijk J Glowacka K Leonelli L Gabilly ST Iwai M Niyogi KK Long SP (2016) 680
Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
Kubota H Sakurai I Katayama K Mizusawa N Ohashi S Kobayashi M Zhang P Aro 683
EM Wada H (2010) Purification and characterization of photosystem I complex 684
from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim 685
Biophys Acta 1797 98-105 686
Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future 702
by engineering crop photosynthesis and yield potential Cell 161 56-66 703
Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
(2011) Solar hydrogen-producing bionanodevice outperforms natural photosynthesis 709
Proc Natl Acad Sci U S A 108 20988-20991 710
Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
production Biochemistry 49 10264-10266 713
Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
organisms using whole-cell and cell-free systems Appl Biochem Biotechnol 183 715
503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
hydrogenases J Biochem 123 644-649 718
Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
(2016) Fusion of ferredoxin and cytochrome P450 enables direct light-driven 720
biosynthesis ACS Chem Biol 11 1862-1869 721
Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous 722
enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
Y Nishihara H (2010) A photosensing system composed of photosystem I 725
molecular wire gold nanoparticle and double surfactants in water Chem Commun 726
(Camb) 46 2557-2559 727
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
(2009) Surface immobilization of PSI using vitamin K1-like molecular wires for 729
fabrication of a bio-photoelectrode J Nanosci Nanotechnol 9 1722-1726 730
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37
Molina-Heredia FP Wastl J Navarro JA Bendall DS Hervas M Howe CJ De La Rosa 731
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Mullineaux CW Emlyn-Jones D (2005) State transitions an example of acclimation to 733
low-light stress J Exp Bot 56 389-393 734
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J 735
Nanosci Nanotechnol 9 1709-1713 736
Nguyen K Bruce BD (2014) Growing green electricity progress and strategies for use of 737
photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello 742
Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in 748
understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in 750
Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
complex Plant Cell 3 383-395 752
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
S Cazzaniga S Bassi R (2015) Heterologous expression of moss light-harvesting 764
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38
complex stress-related 1 (LHCSR1) the chlorophyll a-xanthophyll pigment-protein 765
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24340-24354 767
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins 768
Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
phosphatase TAP38 in LHCII dephosphorylation and thylakoid electron flow PLoS 771
Biol 8 e1000288 772
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
natural product biosynthesis Protoplasma 253 1197-1209 774
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Lett 581 2768-2775 776
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of an oxygen-tolerant [NiFe]-hydrogenase from Cupriavidus necator in Escherichia 779
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Schmid VH (2008) Light-harvesting complexes of vascular plants Cell Mol Life Sci 65 781
3619-3639 782
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rate of evolution of photosynthetic genes in cyanobacteria Mol Biol Evol 22 2179-784
2189 785
Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS 786
Protein Increases Electron Transport Rates and Biomass Yield Plant Physiol 175 787
134-145 788
Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J 789
(2017) Plasmon-induced absorption of blind chlorophylls in photosynthetic proteins 790
assembled on silver nanowires Nanoscale 9 10475-10486 791
792
Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
Sakai M Fujii M Tohri A Iwai M Inoue Y Yoneyama S Minakata M Enami I 794
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1585-1587 797
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39
Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M 798
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Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M 800
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molecular wire Biochim Biophys Acta 1767 653-659 802
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N 803
(2006) Functional replacement of ferredoxin by a cyanobacterial flavodoxin in 804
tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050 805
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
U S A 104 11495-11500 809
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M 810
Norici A Shotland Y Ohad I Kaplan A (2016) The mechanisms whereby the 811
green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled 812
photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
Photosystem I-catalyst hybrids Curr Opin Chem Biol 25 1-8 815
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium 816
Synechocystis sp PCC 6803 carrying spinach sequences Construction and function 817
Photosynth Res 48 147-162 818
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene 819
replacement in Synechocystis sp PCC 6803 Microb Cell Fact 13 4 820
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
thaliana J Biol Chem 278 31286-31289 826
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M 827
Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
dependent pathways into Synechocystis sp PCC 6803 Metab Eng 33 1-11 830
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40
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in 831
functional photosystem II complexes of cyanobacteria Proc Natl Acad Sci U S A 98 832
14168-14173 833
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) 834
Photosynthetic electron partitioning between [FeFe]-hydrogenase and 835
ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S 836
A 108 9396-9401 837
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of 838
alternative electron flow by flavodiiron proteins in Arabidopsis Nat Plants 2 16012 839
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ 840
(2018) Ectopic expression of SsPETE2 a plastocyanin from Suaeda salsa improves 841
plant tolerance to oxidative stress Plant Sci 268 1-10 842
843
844
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wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M Thofner JF Olsen CE Mottawie MS Burow M Pribil MFeussner I Moller BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 dependent pathways intoSynechocystis sp PCC 6803 Metab Eng 33 1-11
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Google Scholar Author Only Title Only Author and Title
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in functional photosystem II complexes ofcyanobacteria Proc Natl Acad Sci U S A 98 14168-14173
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) Photosynthetic electron partitioning between [FeFe]-hydrogenase and ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S A 108 9396-9401
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of alternative electron flow by flavodiiron proteins inArabidopsis Nat Plants 2 16012
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ (2018) Ectopic expression of SsPETE2 a plastocyanin fromSuaeda salsa improves plant tolerance to oxidative stress Plant Sci 268 1-10
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
13
cellular compartment (the ER) utilizing photosynthetically reduced ferredoxin as the electron 296
donor (Nielsen et al 2013 Lassen et al 2014b Gnanasekaran et al 2016 Wlodarczyk et 297
al 2016) Genetic fusions have also been employed for the coupling of P450s to PSI 298
CYP79A1 has been fused to either cyanobacterial PsaM or Arabidopsis ferredoxin and the 299
engineered enzyme showed light-driven activity both in vivo and in vitro (Lassen et al 300
2014b Mellor et al 2016) In the latter case the efficiency of the system was enhanced 301
because the fusion could compete better with endogenous electron sinks coupled to metabolic 302
pathways (Mellor et al 2016) 303
In contrast to PSI-P450 hybrids PSI-hydrogenase hybrids currently function only in 304
vitro Unlike fossil fuels H2 is environmentally benign as it produces only water when 305
combusted Therefore in principle harnessing of the reducing power of photosynthesis for 306
the direct production of H2 (ie ultimately using sunlight and water) would yield a fully 307
sustainable system of energy generation PSI but not PSII provides a standard midpoint 308
potential that is sufficiently negative to power the reduction of protons to H2 (Utschig et al 309
2015) Hence approaches have been developed to engineer PSI to produce H2 either as 310
replacement or in addition to its natural product NADPH (see Figure 1 in Box 1) by 311
redirecting PSI electrons to a catalytic component This catalytic component can be abiotic or 312
biotic (hydrogenases) The feasibility of coupling H2 generation to photosynthesis was 313
demonstrated 45 years ago by mixing chloroplast preparations with ferredoxin and 314
hydrogenase (Benemann et al 1973) Twenty-five years later hydrogen evolution by direct 315
electron transfer (without ferredoxin) from PSI to hydrogenases was accomplished for the 316
first time (McTavish 1998) 317
Hydrogenases catalyze the reversible interconversion of H2 into protons and electrons 318
and are widespread in nature they occur in bacteria and archaea but also in some eukarya In 319
vivo hydrogenases can mediate photosynthetic H2 production albeit mostly indirectly or 320
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14
under anaerobic conditions due to their oxygen sensitivity (Ghirardi 2015 Oey et al 2016) 321
Hydrogenases can be classified according to their metal-ion composition eg [NiFe] and 322
[FeFe] hydrogenases (Lubitz et al 2014 Martin and Frymier 2017) [FeFe] hydrogenases 323
preferentially catalyze proton reduction and can evolve H2 at high rates but are extremely 324
sensitive to O2 and are the only type of hydrogenases found in eukaryotic microorganisms 325
[NiFe] hydrogenases are less sensitive to O2 but preferentially oxidize H2 under 326
physiological conditions (Lubitz et al 2014) In vitro both types of hydrogenases have been 327
directly linked to PSI (Table 3 Fig 4B) PSI-[NiFe] hydrogenase complexes have been 328
generated by fusing the hydrogenase genetically to the PsaE protein (Ihara et al 2006a) PSI-329
[FeFe] hydrogenase complexes were obtained by genetically fusing the hydrogenase to 330
ferredoxin (Yacoby et al 2011) or covalently linking the FeS clusters present in the 331
hydrogenase to PSI via a molecular wire (Lubner et al 2010 Lubner et al 2011) 332
Two parameters characterize the efficiency of these in-vitro systems their H2 333
production rate and longevity While low rates of H2 production (in the range from 01 to 10 334
μmol H2mg chlorophyllh) were described for the early chloroplast extract experiments and 335
genetic fusions of PSI to [NiFe] or [FeFe] hydrogenases (McTavish 1998 Ihara et al 2006a 336
Yacoby et al 2011) higher rates of between 2000 and 3000 μmol H2mg chlorophyllh have 337
been achieved with wired PSI-[FeFe] hydrogenase complexes and genetically fused PSI-338
[NiFe] hydrogenase complexes assembled on a gold electrode (Krassen et al 2009 Lubner 339
et al 2011) Few data are available with respect to the longevity of the PSI-hydrogenase 340
systems however a minimum lifetime of 64 days was reported for a wired [FeFe] 341
hydrogenase-PSI complex at room temperature and under ambient illumination (Lubner et 342
al 2010) 343
The future use of hydrogenases in photosynthesis-driven H2 production will strongly 344
depend on whether or not it is possible to overcome the O2 sensitivity of many hydrogenases 345
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15
by for instance employing oxygen-tolerant [NiFe] hydrogenases (Burgdorf et al 2005 346
Schiffels et al 2013) If this is not possible their efficient use in vivo in thylakoids which 347
inevitably generate O2 during linear electron flow will be impossible However as 348
demonstrated with the gold surface system (Krassen et al 2009) the design of novel 349
matrices into which the hybrid system can be incorporated may markedly enhance the 350
efficiency 351
352
Bio-nano hybrids Use of photosynthesis as a source of electrons for non-biological 353
processes 354
From bio-bio hybrids it is only a small step to developing bio-nano hybrids as demonstrated 355
by PSI hybrids that employ abiotic catalysts for photosynthetic hydrogen production instead 356
of hydrogenase In fact abiotic catalysts have the advantage of bypassing the lability of 357
hydrogenases in the presence of oxygen PSI-platinum hybrids have been produced by 358
combining PSI with platinum nanoparticles (either directly or via tethering by nanowires) or 359
platinum nanoclusters (Kargul et al 2012 Fukuzumi 2015 Utschig et al 2015) (Fig 5A 360
Table 4) Current PSI-platinum hybrids are less efficient than the most advanced PSI-361
hydrogenase systems but are extremely robust (Utschig et al 2015) However future 362
widespread usage of the PSI-platinum system will be limited by the high cost of platinum A 363
more economical alternative to precious metals are earth-abundant molecular catalysts 364
However hybrids consisting of PSI and earth-abundant molecular catalysts have a much 365
shorter working life than platinum-based configurations (Utschig et al 2015) likely due to 366
instability of the molecular catalyst 367
PSI-based photocurrent-producing devices constitute another class of photosynthesis-368
derived nano-bio systems (Table 4 Fig 5) In such devices PSI is immobilized onto 369
electrodes Many variants of this concept have been tested such as varying the electrode 370
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16
materials immobilizationorientation strategies andor artificial redox mediators (Nguyen and 371
Bruce 2014 Janna Olmos and Kargul 2015 Plumereacute and Nowaczyk 2017 Kargul et al 372
2018) PSI must be immobilized on the electrode surface in such a way that electron transfers 373
between the electrodes and the oxidizing (P700) and reducing (FB - the terminal [4Fe-4S] 374
cluster or an intermediate electron transporter) sites of PSI can proceed with the required 375
efficiency Electrons are transferred between the electrodes and the oxidizing or reducing 376
sides of PSI either by a diffusible redox mediator or molecular wires Examples of electrode 377
materials and redox mediators are provided in Table 4 After P700 photo-excitation electrons 378
are transferred from P700 via several factors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB) to the 379
iron-sulfur cluster FB (see legend of Box 1) As in the case of PSI-hydrogenase and PSI-380
platinum nanoparticles PSI can be wired to its electrodes This has been achieved by wiring 381
the A1 cofactor (phylloquinone) to the substrate surface such that electrons are directly 382
transferred from A1 to the electrode thus bypassing the downstream FeS clusters (FX FA FB) 383
in the stromal domain of PSI (Terasaki et al 2007 Miyachi et al 2009 Terasaki et al 384
2009 Miyachi et al 2010) 385
Modifications of PSI have been utilized to enhance the efficiency of the photocurrent-386
generating system (Das et al 2004 Frolov et al 2005 Carmeli et al 2010) As mentioned 387
previously fusions to the stroma-faced PSI subunit PsaE can be used to link new components 388
to PSI however in this case PsaD fusions were used To this end recombinant His-tagged 389
PsaD was immobilized on the functionalized electrode surface which was then exposed to 390
native PSI complexes resulting in immobilized PSI with P700 facing away from the 391
electrode (Das et al 2004) Another way to control the orientation of PSI during 392
immobilization involves introducing cysteine mutations To allow for direct thiol coupling to 393
an Au surface various residues on the lumen-exposed face of PSI were replaced by cysteine 394
and tested (Frolov et al 2005) PSI attachment was achieved with all single mutants even 395
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17
those placed further from the P700 site suggesting that a specific location is not required as 396
long as the cysteine is exposed at the luminal surface of PSI The concept of targeted 397
attachment via introduced cysteine residues was exploited in subsequent studies to link PSI to 398
maleimide-functionalized gallium arsenide (Frolov et al 2008) to immobilize PSI between 399
the substrate and a metallized scanning near-field optical microscopy tip (Gerster et al 400
2012) and to bind PSI to carbon nanotubes (Kaniber et al 2010) Another modification of 401
PSI is represented by the attachment of plasmonic metal nanoparticles which resulted in 402
enhanced light absorption (Carmeli et al 2010) even in the green part of the solar spectrum 403
that is not normally absorbed (Szalkowski et al 2017) This suggests that it is possible to 404
enhance light absorption by PSI in vitro through the attachment of abiotic components that 405
act as optical antennae to extend the spectrum of photons available for P700 activation 406
Taken together these efforts demonstrate that PSI-based photocurrent-generating 407
systems are still in an exploratory phase with many variants under development In the next 408
phase viable building blocks and reference systems should be established that can serve as 409
starting points for the systematic engineering of superior systems This will require the 410
modification of PSI for optimal effect in artificial systems and will undoubtedly differ 411
substantially from the original environment in which PSI was molded by biological 412
evolution 413
414
Concluding remarks and outlook 415
Enhancing photosynthesis and growth can be achieved by a simple overexpression of certain 416
photosynthetic proteins and PSI can be coupled to previously unconnected biotic or abiotic 417
components to generate valuable compounds hydrogen or electricity Moreover entire 418
photosynthetic complexes can be functionally expressed in distantly related species (as 419
demonstrated for RuBisCO Aigner et al 2017) Thus what are the next goals and which 420
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18
challenges need to be overcome Two challenges for the in vivo systems are obvious (i) 421
enhancing the efficiency of in-vivo bio-bio hybrids and (ii) upscaling the size of ldquosynthetic 422
photosynthetic modulesrdquo to cover entire photosystems or complex antenna systems 423
With respect to the enhancement of in vivo cyanobacterial and algal systems 424
harboring hybrid configurations in which photosynthesis directly drives previously 425
unconnected pathways the use of laboratory evolution offers a unique opportunity to tailor 426
these systems for their intended purpose Laboratory evolution utilizes the high rate of 427
evolution typical in microbial systems (in particular if suitable selection conditions can be 428
designed) to fine tune and optimize processes through selection of advantageous genetic 429
variation While this strategy has been employed in E coli and yeast with impressive success 430
now photosynthetic microbial systems are emerging as attractive targets for this approach 431
(Leister 2017) 432
The exchange of entire multiprotein complexes between distantly related species will 433
not be a simple exercise because the ldquofrozen metabolic staterdquo of the core photosynthetic 434
complexes will necessitate the exchange of major parts of photosystems rather than 435
individual subunits The RuBisCO case study by Aigner et al (2017) represents of promising 436
proof of principle but one needs to consider that the synthetic RuBisCO module comprised 437
only the two different subunits present in the mature complex and five auxiliary factors for its 438
assembly Entire photosystems will require much larger ldquosynthetic photosynthetic modulesrdquo 439
and many of the auxiliary factors have not been identified yet Therefore when designing 440
these complex ldquosynthetic photosynthetic modulesrdquo we will identify the set of components 441
that are sufficient (and not only necessary) to drive photosynthesis providing an 442
unprecedentedly deep understanding of this fundamental and complex process 443
Given that the problems described above can be solved what will be the next steps in 444
the synthetic biology of the light reactions of photosynthesis The combination of ldquosynthetic 445
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19
photosynthetic modulesrdquo from diverse species could allow the design of novel variants of 446
photosynthesis Numerous instances of such ldquorecombined photosynthetic variantsrdquo can be 447
imagined including plants that employ cyanobacteria-derived phycobilisomes for highly 448
sufficient photosynthesis under low light conditions cyanobacteria that employ plant-derived 449
LHCs as antenna to shift light saturation of photosynthesis to higher intensities or the 450
integration of cyanobacterial Chl d and Chl f (which can absorb far-red and near infra-red 451
light) into algal or plant photosynthesis to expand the spectral region available to drive 452
photosynthesis (Loughlin et al 2013 Ho et al 2016) Moreover such variants of 453
recombined photosynthesis could be further optimized by laboratory evolution within a 454
suitable microbial chassis However such recombined photosynthetic variants cannot be 455
considered a truly novel type of photosynthesis because they would only bring preexisting 456
pieces together that evolution has separated Nevertheless they could be an important step 457
towards the ambitious goal to design truly novel ldquosynthetic photosynthetic modulesrdquo that 458
contain more efficient substitutes of the ldquofrozen metabolic accidentsrdquo discussed above 459
Ample proof of functionality for in-vivo hybrids (between photosynthesis and 460
previously unconnected metabolic pathways) and in-vitro hybrids (between PSI and biotic or 461
abiotic catalysts) has been obtained but such systems will only be commercially successful if 462
they can compete with established non-biological systems Tailoring of PSI in cyanobacteria 463
where techniques like gene replacement and gene modification are routine may contribute to 464
further improving the efficiency and robustness of in vitro and in vivo hybrids One 465
promising route could be to identify those parts of the original PSI (which evolved under 466
constraints imposed by the cyanobacterial cell) that are necessary for hybrid devices (a 467
ldquominimalrdquo PSI) Such bio-nano systems can be optimized to include novel non-biological 468
components that replace or complement natural pigments andor the protein-based backbone 469
of photosystems going far beyond the limited toolbox of Naturersquos chemistry Such novel 470
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20
systems inspired by natural photosynthesis could be used to engage biologists in the design 471
of fundamentally different types of photosynthesis in living organisms 472
473
SUPPLEMENTAL DATA 474
Supplemental Table 1 Absencepresence of photosynthetic proteins in the three model 475
species Synechocystis PCC6803 (Syn) Chlamydomonas reinhardtii (Cr) and Arabidopsis 476
thaliana (At) 477
478
ACKNOWLEDGMENTS 479
The authors thank Paul Hardy for critical reading of the manuscript 480
481
482
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21
Table 1 Replacement of conserved individual or multiple photosynthetic proteins 483
GeneProtein Description Protein
identity
Reference
psbAD1 Synechocystis D1 was replaced by its homolog from
Poa annua which resulted in slower growth This is
likely to be due to increased charge recombination
between the donor and acceptor sides of the reaction
center
86 Nixon et al
1991
psbBCP47 Synechocystis CP47 was replaced by its homolog
from spinach and photoautotrophy was lost
80 Vermaas et
al 1996
psbCCP43 Synechocystis CP43 was replaced by its homolog
from spinach and photoautotrophy was lost
85 Carpenter et
al 1993
psbHPsbH Synechocystis PsbH was replaced by its counterpart
from maize The resulting strain displayed increased
light sensitivity and lower chlorophyll content
78 Chiaramonte
et al 1999
psaAPsaA Synechocystis PsaA was replaced by its equivalent
from A thaliana This resulted in reduced photo-
autotrophical growth and a drastically reduced
ChlPC ratio
80 Viola et al
2014
psbABCDEF
D1CP47CP43D2
Cyt b559-+
All six core subunits of C reinhardtii were replaced
by their counterparts from two different green algae
(V carteri and S obliquus) The resulting strains
were photoautotrophic but showed reduced
photosynthetic efficiency and the heterologous
82 -
99
Gimpel et al
2016
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22
proteins reached only between 10 and 20 of the
levels of those they replaced
484
485
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23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
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24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
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25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
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26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
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28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
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32
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Improving photosynthesis and crop productivity by accelerating recovery from 681
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Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
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Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
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enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
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Photosynth Res 116 277-293 705
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Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
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Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
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enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
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37
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Rev Plant Biol 64 609-635 741
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biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
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hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
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Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
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236-248 762
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38
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Adv Biochem Eng Biotechnol 158 111-136 769
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Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
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2189 785
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134-145 788
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Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
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40
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843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
14
under anaerobic conditions due to their oxygen sensitivity (Ghirardi 2015 Oey et al 2016) 321
Hydrogenases can be classified according to their metal-ion composition eg [NiFe] and 322
[FeFe] hydrogenases (Lubitz et al 2014 Martin and Frymier 2017) [FeFe] hydrogenases 323
preferentially catalyze proton reduction and can evolve H2 at high rates but are extremely 324
sensitive to O2 and are the only type of hydrogenases found in eukaryotic microorganisms 325
[NiFe] hydrogenases are less sensitive to O2 but preferentially oxidize H2 under 326
physiological conditions (Lubitz et al 2014) In vitro both types of hydrogenases have been 327
directly linked to PSI (Table 3 Fig 4B) PSI-[NiFe] hydrogenase complexes have been 328
generated by fusing the hydrogenase genetically to the PsaE protein (Ihara et al 2006a) PSI-329
[FeFe] hydrogenase complexes were obtained by genetically fusing the hydrogenase to 330
ferredoxin (Yacoby et al 2011) or covalently linking the FeS clusters present in the 331
hydrogenase to PSI via a molecular wire (Lubner et al 2010 Lubner et al 2011) 332
Two parameters characterize the efficiency of these in-vitro systems their H2 333
production rate and longevity While low rates of H2 production (in the range from 01 to 10 334
μmol H2mg chlorophyllh) were described for the early chloroplast extract experiments and 335
genetic fusions of PSI to [NiFe] or [FeFe] hydrogenases (McTavish 1998 Ihara et al 2006a 336
Yacoby et al 2011) higher rates of between 2000 and 3000 μmol H2mg chlorophyllh have 337
been achieved with wired PSI-[FeFe] hydrogenase complexes and genetically fused PSI-338
[NiFe] hydrogenase complexes assembled on a gold electrode (Krassen et al 2009 Lubner 339
et al 2011) Few data are available with respect to the longevity of the PSI-hydrogenase 340
systems however a minimum lifetime of 64 days was reported for a wired [FeFe] 341
hydrogenase-PSI complex at room temperature and under ambient illumination (Lubner et 342
al 2010) 343
The future use of hydrogenases in photosynthesis-driven H2 production will strongly 344
depend on whether or not it is possible to overcome the O2 sensitivity of many hydrogenases 345
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
15
by for instance employing oxygen-tolerant [NiFe] hydrogenases (Burgdorf et al 2005 346
Schiffels et al 2013) If this is not possible their efficient use in vivo in thylakoids which 347
inevitably generate O2 during linear electron flow will be impossible However as 348
demonstrated with the gold surface system (Krassen et al 2009) the design of novel 349
matrices into which the hybrid system can be incorporated may markedly enhance the 350
efficiency 351
352
Bio-nano hybrids Use of photosynthesis as a source of electrons for non-biological 353
processes 354
From bio-bio hybrids it is only a small step to developing bio-nano hybrids as demonstrated 355
by PSI hybrids that employ abiotic catalysts for photosynthetic hydrogen production instead 356
of hydrogenase In fact abiotic catalysts have the advantage of bypassing the lability of 357
hydrogenases in the presence of oxygen PSI-platinum hybrids have been produced by 358
combining PSI with platinum nanoparticles (either directly or via tethering by nanowires) or 359
platinum nanoclusters (Kargul et al 2012 Fukuzumi 2015 Utschig et al 2015) (Fig 5A 360
Table 4) Current PSI-platinum hybrids are less efficient than the most advanced PSI-361
hydrogenase systems but are extremely robust (Utschig et al 2015) However future 362
widespread usage of the PSI-platinum system will be limited by the high cost of platinum A 363
more economical alternative to precious metals are earth-abundant molecular catalysts 364
However hybrids consisting of PSI and earth-abundant molecular catalysts have a much 365
shorter working life than platinum-based configurations (Utschig et al 2015) likely due to 366
instability of the molecular catalyst 367
PSI-based photocurrent-producing devices constitute another class of photosynthesis-368
derived nano-bio systems (Table 4 Fig 5) In such devices PSI is immobilized onto 369
electrodes Many variants of this concept have been tested such as varying the electrode 370
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16
materials immobilizationorientation strategies andor artificial redox mediators (Nguyen and 371
Bruce 2014 Janna Olmos and Kargul 2015 Plumereacute and Nowaczyk 2017 Kargul et al 372
2018) PSI must be immobilized on the electrode surface in such a way that electron transfers 373
between the electrodes and the oxidizing (P700) and reducing (FB - the terminal [4Fe-4S] 374
cluster or an intermediate electron transporter) sites of PSI can proceed with the required 375
efficiency Electrons are transferred between the electrodes and the oxidizing or reducing 376
sides of PSI either by a diffusible redox mediator or molecular wires Examples of electrode 377
materials and redox mediators are provided in Table 4 After P700 photo-excitation electrons 378
are transferred from P700 via several factors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB) to the 379
iron-sulfur cluster FB (see legend of Box 1) As in the case of PSI-hydrogenase and PSI-380
platinum nanoparticles PSI can be wired to its electrodes This has been achieved by wiring 381
the A1 cofactor (phylloquinone) to the substrate surface such that electrons are directly 382
transferred from A1 to the electrode thus bypassing the downstream FeS clusters (FX FA FB) 383
in the stromal domain of PSI (Terasaki et al 2007 Miyachi et al 2009 Terasaki et al 384
2009 Miyachi et al 2010) 385
Modifications of PSI have been utilized to enhance the efficiency of the photocurrent-386
generating system (Das et al 2004 Frolov et al 2005 Carmeli et al 2010) As mentioned 387
previously fusions to the stroma-faced PSI subunit PsaE can be used to link new components 388
to PSI however in this case PsaD fusions were used To this end recombinant His-tagged 389
PsaD was immobilized on the functionalized electrode surface which was then exposed to 390
native PSI complexes resulting in immobilized PSI with P700 facing away from the 391
electrode (Das et al 2004) Another way to control the orientation of PSI during 392
immobilization involves introducing cysteine mutations To allow for direct thiol coupling to 393
an Au surface various residues on the lumen-exposed face of PSI were replaced by cysteine 394
and tested (Frolov et al 2005) PSI attachment was achieved with all single mutants even 395
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17
those placed further from the P700 site suggesting that a specific location is not required as 396
long as the cysteine is exposed at the luminal surface of PSI The concept of targeted 397
attachment via introduced cysteine residues was exploited in subsequent studies to link PSI to 398
maleimide-functionalized gallium arsenide (Frolov et al 2008) to immobilize PSI between 399
the substrate and a metallized scanning near-field optical microscopy tip (Gerster et al 400
2012) and to bind PSI to carbon nanotubes (Kaniber et al 2010) Another modification of 401
PSI is represented by the attachment of plasmonic metal nanoparticles which resulted in 402
enhanced light absorption (Carmeli et al 2010) even in the green part of the solar spectrum 403
that is not normally absorbed (Szalkowski et al 2017) This suggests that it is possible to 404
enhance light absorption by PSI in vitro through the attachment of abiotic components that 405
act as optical antennae to extend the spectrum of photons available for P700 activation 406
Taken together these efforts demonstrate that PSI-based photocurrent-generating 407
systems are still in an exploratory phase with many variants under development In the next 408
phase viable building blocks and reference systems should be established that can serve as 409
starting points for the systematic engineering of superior systems This will require the 410
modification of PSI for optimal effect in artificial systems and will undoubtedly differ 411
substantially from the original environment in which PSI was molded by biological 412
evolution 413
414
Concluding remarks and outlook 415
Enhancing photosynthesis and growth can be achieved by a simple overexpression of certain 416
photosynthetic proteins and PSI can be coupled to previously unconnected biotic or abiotic 417
components to generate valuable compounds hydrogen or electricity Moreover entire 418
photosynthetic complexes can be functionally expressed in distantly related species (as 419
demonstrated for RuBisCO Aigner et al 2017) Thus what are the next goals and which 420
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18
challenges need to be overcome Two challenges for the in vivo systems are obvious (i) 421
enhancing the efficiency of in-vivo bio-bio hybrids and (ii) upscaling the size of ldquosynthetic 422
photosynthetic modulesrdquo to cover entire photosystems or complex antenna systems 423
With respect to the enhancement of in vivo cyanobacterial and algal systems 424
harboring hybrid configurations in which photosynthesis directly drives previously 425
unconnected pathways the use of laboratory evolution offers a unique opportunity to tailor 426
these systems for their intended purpose Laboratory evolution utilizes the high rate of 427
evolution typical in microbial systems (in particular if suitable selection conditions can be 428
designed) to fine tune and optimize processes through selection of advantageous genetic 429
variation While this strategy has been employed in E coli and yeast with impressive success 430
now photosynthetic microbial systems are emerging as attractive targets for this approach 431
(Leister 2017) 432
The exchange of entire multiprotein complexes between distantly related species will 433
not be a simple exercise because the ldquofrozen metabolic staterdquo of the core photosynthetic 434
complexes will necessitate the exchange of major parts of photosystems rather than 435
individual subunits The RuBisCO case study by Aigner et al (2017) represents of promising 436
proof of principle but one needs to consider that the synthetic RuBisCO module comprised 437
only the two different subunits present in the mature complex and five auxiliary factors for its 438
assembly Entire photosystems will require much larger ldquosynthetic photosynthetic modulesrdquo 439
and many of the auxiliary factors have not been identified yet Therefore when designing 440
these complex ldquosynthetic photosynthetic modulesrdquo we will identify the set of components 441
that are sufficient (and not only necessary) to drive photosynthesis providing an 442
unprecedentedly deep understanding of this fundamental and complex process 443
Given that the problems described above can be solved what will be the next steps in 444
the synthetic biology of the light reactions of photosynthesis The combination of ldquosynthetic 445
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19
photosynthetic modulesrdquo from diverse species could allow the design of novel variants of 446
photosynthesis Numerous instances of such ldquorecombined photosynthetic variantsrdquo can be 447
imagined including plants that employ cyanobacteria-derived phycobilisomes for highly 448
sufficient photosynthesis under low light conditions cyanobacteria that employ plant-derived 449
LHCs as antenna to shift light saturation of photosynthesis to higher intensities or the 450
integration of cyanobacterial Chl d and Chl f (which can absorb far-red and near infra-red 451
light) into algal or plant photosynthesis to expand the spectral region available to drive 452
photosynthesis (Loughlin et al 2013 Ho et al 2016) Moreover such variants of 453
recombined photosynthesis could be further optimized by laboratory evolution within a 454
suitable microbial chassis However such recombined photosynthetic variants cannot be 455
considered a truly novel type of photosynthesis because they would only bring preexisting 456
pieces together that evolution has separated Nevertheless they could be an important step 457
towards the ambitious goal to design truly novel ldquosynthetic photosynthetic modulesrdquo that 458
contain more efficient substitutes of the ldquofrozen metabolic accidentsrdquo discussed above 459
Ample proof of functionality for in-vivo hybrids (between photosynthesis and 460
previously unconnected metabolic pathways) and in-vitro hybrids (between PSI and biotic or 461
abiotic catalysts) has been obtained but such systems will only be commercially successful if 462
they can compete with established non-biological systems Tailoring of PSI in cyanobacteria 463
where techniques like gene replacement and gene modification are routine may contribute to 464
further improving the efficiency and robustness of in vitro and in vivo hybrids One 465
promising route could be to identify those parts of the original PSI (which evolved under 466
constraints imposed by the cyanobacterial cell) that are necessary for hybrid devices (a 467
ldquominimalrdquo PSI) Such bio-nano systems can be optimized to include novel non-biological 468
components that replace or complement natural pigments andor the protein-based backbone 469
of photosystems going far beyond the limited toolbox of Naturersquos chemistry Such novel 470
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20
systems inspired by natural photosynthesis could be used to engage biologists in the design 471
of fundamentally different types of photosynthesis in living organisms 472
473
SUPPLEMENTAL DATA 474
Supplemental Table 1 Absencepresence of photosynthetic proteins in the three model 475
species Synechocystis PCC6803 (Syn) Chlamydomonas reinhardtii (Cr) and Arabidopsis 476
thaliana (At) 477
478
ACKNOWLEDGMENTS 479
The authors thank Paul Hardy for critical reading of the manuscript 480
481
482
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21
Table 1 Replacement of conserved individual or multiple photosynthetic proteins 483
GeneProtein Description Protein
identity
Reference
psbAD1 Synechocystis D1 was replaced by its homolog from
Poa annua which resulted in slower growth This is
likely to be due to increased charge recombination
between the donor and acceptor sides of the reaction
center
86 Nixon et al
1991
psbBCP47 Synechocystis CP47 was replaced by its homolog
from spinach and photoautotrophy was lost
80 Vermaas et
al 1996
psbCCP43 Synechocystis CP43 was replaced by its homolog
from spinach and photoautotrophy was lost
85 Carpenter et
al 1993
psbHPsbH Synechocystis PsbH was replaced by its counterpart
from maize The resulting strain displayed increased
light sensitivity and lower chlorophyll content
78 Chiaramonte
et al 1999
psaAPsaA Synechocystis PsaA was replaced by its equivalent
from A thaliana This resulted in reduced photo-
autotrophical growth and a drastically reduced
ChlPC ratio
80 Viola et al
2014
psbABCDEF
D1CP47CP43D2
Cyt b559-+
All six core subunits of C reinhardtii were replaced
by their counterparts from two different green algae
(V carteri and S obliquus) The resulting strains
were photoautotrophic but showed reduced
photosynthetic efficiency and the heterologous
82 -
99
Gimpel et al
2016
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22
proteins reached only between 10 and 20 of the
levels of those they replaced
484
485
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23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
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24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
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25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
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26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
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28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
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32
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566
Aigner H Wilson RH Bracher A Calisse L Bhat JY Hartl FU Hayer-Hartl M (2017) 567
Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
chloroplast-ferredoxin-hydrogenase system Proc Natl Acad Sci U S A 70 2317-2320 571
Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
complements ferredoxin deficiency in knocked-down transgenic tobacco plants Plant 574
J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
photosynthesis for energy production Curr Opin Chem Biol 17 457-461 577
Burgdorf T Lenz O Buhrke T van der Linden E Jones AK Albracht SP Friedrich B 578
(2005) [NiFe]-hydrogenases of Ralstonia eutropha H16 modular enzymes for 579
oxygen-tolerant biological hydrogen oxidation J Mol Microbiol Biotechnol 10 181-580
96 581
Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
(2010) Broad band enhancement of light absorption in photosystem I by metal 583
nanoparticle antennas Nano Lett 10 2069-2074 584
Carpenter SD Ohad I Vermaas WF (1993) Analysis of chimeric spinachcyanobacterial 585
CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
the water-splitting system of Photosystem II Biochim Biophys Acta 1144 204-212 587
Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
Eur J Biochem 260 833-843 593
Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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33
Ciornii D Riedel M Stieger KR Feifel SC Hejazi M Lokstein H Zouni A Lisdat F 598
(2017) Bioelectronic Circuit on a 3D Electrode Architecture Enzymatic Catalysis 599
Interconnected with Photosystem I J Am Chem Soc 139 16478-16481 600
Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel 601
genetic diversity Philos Trans R Soc Lond B Biol Sci 372 602
Das R Kiley PJ Segal M Norville J Yu AA Wang L Trammell SA Reddick LE 603
Kumar R Stellacci F Lebedev N Schnur J Bruce BD Zhang S Baldo M (2004) 604
Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
by thermal dissipation of excess energy Biochem Soc Trans 38 651-660 608
Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
device by direct chemical binding of the photosynthetic reaction center protein to 610
metal surfaces Advanced Materials 17 2434-2437 611
Frolov L Rosenwaks Y Richter S Carmeli C Carmeli I (2008) Photoelectric junctions 612
between GaAs and photosynthetic reaction center protein J Phys Chem C 112 613
13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I 617
Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
reinhardtii ACS Synth Biol 5 589-596 624
Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
state biophotovoltaic cells containing photosystem I Adv Mater 26 4863-4869 630
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34
Glowacka K Kromdijk J Kucera K Xie J Cavanagh AP Leonelli L Leakey ADB Ort 631
DR Niyogi KK Long SP (2018) Photosystem II subunit S overexpression increases 632
the efficiency of water use in a field-grown crop Nat Commun 9 868 633
Gnanasekaran T Karcher D Nielsen AZ Martens HJ Ruf S Kroop X Olsen CE 634
Motawie MS Pribil M Moller BL Bock R Jensen PE (2016) Transfer of the 635
cytochrome P450-dependent dhurrin pathway from Sorghum bicolor into Nicotiana 636
tabacum chloroplasts for light-driven synthesis J Exp Bot 67 2495-2506 637
Haniewicz P Abram M Nosek L Kirkpatrick J El-Mohsnawy E Olmos JDJ Kouřil 638
R Kargul JM (2018) Molecular mechanisms of photoadaptation of photosystem I 639
supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
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Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
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Holt NE Fleming GR Niyogi KK (2004) Toward an understanding of the mechanism of 647
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Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
D Kamachi T Okura I (2006a) Light-driven hydrogen production by a hybrid 650
complex of a [NiFe]-hydrogenase and the cyanobacterial photosystem I Photochem 651
Photobiol 82 676-682 652
Ihara M Nakamoto H Kamachi T Okura I Maeda M (2006b) Photoinduced hydrogen 653
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Olmos JD Kargul J (2015) A quest for the artificial leaf Int J Biochem Cell Biol 656
66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
Pawlak D Kargul J (2017) Biofunctionalisation of p-doped silicon with cytochrome 659
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Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations 662
ACS Chem Biol 6 533-539 663
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35
Jensen PE Leister D (2014) Chloroplast evolution structure and functions F1000Prime 664
Rep 6 40 665
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip 666
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2872-2873 668
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and 669
its application in biomimetic solar-to-fuel systems J Plant Physiol 169 1639-1653 670
Kargul J Bubak G Andryianau G (2018) Biophotovoltaic systems based on 671
photosynthetic complexes In Wandelt K (Ed) Encyclopedia of Interfacial 672
Chemistry Surface Science and Electrochemistry vol 7 pp 43-63 673
Kim YS Hara M Ikebukuro K Miyake J Ohkawa H Karube I (1996) Photo-induced 674
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chloroplasts Biotechnol Tech 10 717minus720 676
Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic 677
hydrogen production by a hybrid complex of photosystem I and [NiFe]-hydrogenase 678
ACS Nano 3 4055-4061 679
Kromdijk J Glowacka K Leonelli L Gabilly ST Iwai M Niyogi KK Long SP (2016) 680
Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
Kubota H Sakurai I Katayama K Mizusawa N Ohashi S Kobayashi M Zhang P Aro 683
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from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim 685
Biophys Acta 1797 98-105 686
Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
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Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
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Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
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Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
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503-519 716
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Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
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biosynthesis ACS Chem Biol 11 1862-1869 721
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enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
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37
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low-light stress J Exp Bot 56 389-393 734
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Nanosci Nanotechnol 9 1709-1713 736
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photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
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Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
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understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
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Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
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Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
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24340-24354 767
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Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
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Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
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2189 785
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134-145 788
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Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
U S A 104 11495-11500 809
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M 810
Norici A Shotland Y Ohad I Kaplan A (2016) The mechanisms whereby the 811
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photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
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Synechocystis sp PCC 6803 carrying spinach sequences Construction and function 817
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Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
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Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
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40
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843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
15
by for instance employing oxygen-tolerant [NiFe] hydrogenases (Burgdorf et al 2005 346
Schiffels et al 2013) If this is not possible their efficient use in vivo in thylakoids which 347
inevitably generate O2 during linear electron flow will be impossible However as 348
demonstrated with the gold surface system (Krassen et al 2009) the design of novel 349
matrices into which the hybrid system can be incorporated may markedly enhance the 350
efficiency 351
352
Bio-nano hybrids Use of photosynthesis as a source of electrons for non-biological 353
processes 354
From bio-bio hybrids it is only a small step to developing bio-nano hybrids as demonstrated 355
by PSI hybrids that employ abiotic catalysts for photosynthetic hydrogen production instead 356
of hydrogenase In fact abiotic catalysts have the advantage of bypassing the lability of 357
hydrogenases in the presence of oxygen PSI-platinum hybrids have been produced by 358
combining PSI with platinum nanoparticles (either directly or via tethering by nanowires) or 359
platinum nanoclusters (Kargul et al 2012 Fukuzumi 2015 Utschig et al 2015) (Fig 5A 360
Table 4) Current PSI-platinum hybrids are less efficient than the most advanced PSI-361
hydrogenase systems but are extremely robust (Utschig et al 2015) However future 362
widespread usage of the PSI-platinum system will be limited by the high cost of platinum A 363
more economical alternative to precious metals are earth-abundant molecular catalysts 364
However hybrids consisting of PSI and earth-abundant molecular catalysts have a much 365
shorter working life than platinum-based configurations (Utschig et al 2015) likely due to 366
instability of the molecular catalyst 367
PSI-based photocurrent-producing devices constitute another class of photosynthesis-368
derived nano-bio systems (Table 4 Fig 5) In such devices PSI is immobilized onto 369
electrodes Many variants of this concept have been tested such as varying the electrode 370
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16
materials immobilizationorientation strategies andor artificial redox mediators (Nguyen and 371
Bruce 2014 Janna Olmos and Kargul 2015 Plumereacute and Nowaczyk 2017 Kargul et al 372
2018) PSI must be immobilized on the electrode surface in such a way that electron transfers 373
between the electrodes and the oxidizing (P700) and reducing (FB - the terminal [4Fe-4S] 374
cluster or an intermediate electron transporter) sites of PSI can proceed with the required 375
efficiency Electrons are transferred between the electrodes and the oxidizing or reducing 376
sides of PSI either by a diffusible redox mediator or molecular wires Examples of electrode 377
materials and redox mediators are provided in Table 4 After P700 photo-excitation electrons 378
are transferred from P700 via several factors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB) to the 379
iron-sulfur cluster FB (see legend of Box 1) As in the case of PSI-hydrogenase and PSI-380
platinum nanoparticles PSI can be wired to its electrodes This has been achieved by wiring 381
the A1 cofactor (phylloquinone) to the substrate surface such that electrons are directly 382
transferred from A1 to the electrode thus bypassing the downstream FeS clusters (FX FA FB) 383
in the stromal domain of PSI (Terasaki et al 2007 Miyachi et al 2009 Terasaki et al 384
2009 Miyachi et al 2010) 385
Modifications of PSI have been utilized to enhance the efficiency of the photocurrent-386
generating system (Das et al 2004 Frolov et al 2005 Carmeli et al 2010) As mentioned 387
previously fusions to the stroma-faced PSI subunit PsaE can be used to link new components 388
to PSI however in this case PsaD fusions were used To this end recombinant His-tagged 389
PsaD was immobilized on the functionalized electrode surface which was then exposed to 390
native PSI complexes resulting in immobilized PSI with P700 facing away from the 391
electrode (Das et al 2004) Another way to control the orientation of PSI during 392
immobilization involves introducing cysteine mutations To allow for direct thiol coupling to 393
an Au surface various residues on the lumen-exposed face of PSI were replaced by cysteine 394
and tested (Frolov et al 2005) PSI attachment was achieved with all single mutants even 395
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
17
those placed further from the P700 site suggesting that a specific location is not required as 396
long as the cysteine is exposed at the luminal surface of PSI The concept of targeted 397
attachment via introduced cysteine residues was exploited in subsequent studies to link PSI to 398
maleimide-functionalized gallium arsenide (Frolov et al 2008) to immobilize PSI between 399
the substrate and a metallized scanning near-field optical microscopy tip (Gerster et al 400
2012) and to bind PSI to carbon nanotubes (Kaniber et al 2010) Another modification of 401
PSI is represented by the attachment of plasmonic metal nanoparticles which resulted in 402
enhanced light absorption (Carmeli et al 2010) even in the green part of the solar spectrum 403
that is not normally absorbed (Szalkowski et al 2017) This suggests that it is possible to 404
enhance light absorption by PSI in vitro through the attachment of abiotic components that 405
act as optical antennae to extend the spectrum of photons available for P700 activation 406
Taken together these efforts demonstrate that PSI-based photocurrent-generating 407
systems are still in an exploratory phase with many variants under development In the next 408
phase viable building blocks and reference systems should be established that can serve as 409
starting points for the systematic engineering of superior systems This will require the 410
modification of PSI for optimal effect in artificial systems and will undoubtedly differ 411
substantially from the original environment in which PSI was molded by biological 412
evolution 413
414
Concluding remarks and outlook 415
Enhancing photosynthesis and growth can be achieved by a simple overexpression of certain 416
photosynthetic proteins and PSI can be coupled to previously unconnected biotic or abiotic 417
components to generate valuable compounds hydrogen or electricity Moreover entire 418
photosynthetic complexes can be functionally expressed in distantly related species (as 419
demonstrated for RuBisCO Aigner et al 2017) Thus what are the next goals and which 420
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18
challenges need to be overcome Two challenges for the in vivo systems are obvious (i) 421
enhancing the efficiency of in-vivo bio-bio hybrids and (ii) upscaling the size of ldquosynthetic 422
photosynthetic modulesrdquo to cover entire photosystems or complex antenna systems 423
With respect to the enhancement of in vivo cyanobacterial and algal systems 424
harboring hybrid configurations in which photosynthesis directly drives previously 425
unconnected pathways the use of laboratory evolution offers a unique opportunity to tailor 426
these systems for their intended purpose Laboratory evolution utilizes the high rate of 427
evolution typical in microbial systems (in particular if suitable selection conditions can be 428
designed) to fine tune and optimize processes through selection of advantageous genetic 429
variation While this strategy has been employed in E coli and yeast with impressive success 430
now photosynthetic microbial systems are emerging as attractive targets for this approach 431
(Leister 2017) 432
The exchange of entire multiprotein complexes between distantly related species will 433
not be a simple exercise because the ldquofrozen metabolic staterdquo of the core photosynthetic 434
complexes will necessitate the exchange of major parts of photosystems rather than 435
individual subunits The RuBisCO case study by Aigner et al (2017) represents of promising 436
proof of principle but one needs to consider that the synthetic RuBisCO module comprised 437
only the two different subunits present in the mature complex and five auxiliary factors for its 438
assembly Entire photosystems will require much larger ldquosynthetic photosynthetic modulesrdquo 439
and many of the auxiliary factors have not been identified yet Therefore when designing 440
these complex ldquosynthetic photosynthetic modulesrdquo we will identify the set of components 441
that are sufficient (and not only necessary) to drive photosynthesis providing an 442
unprecedentedly deep understanding of this fundamental and complex process 443
Given that the problems described above can be solved what will be the next steps in 444
the synthetic biology of the light reactions of photosynthesis The combination of ldquosynthetic 445
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19
photosynthetic modulesrdquo from diverse species could allow the design of novel variants of 446
photosynthesis Numerous instances of such ldquorecombined photosynthetic variantsrdquo can be 447
imagined including plants that employ cyanobacteria-derived phycobilisomes for highly 448
sufficient photosynthesis under low light conditions cyanobacteria that employ plant-derived 449
LHCs as antenna to shift light saturation of photosynthesis to higher intensities or the 450
integration of cyanobacterial Chl d and Chl f (which can absorb far-red and near infra-red 451
light) into algal or plant photosynthesis to expand the spectral region available to drive 452
photosynthesis (Loughlin et al 2013 Ho et al 2016) Moreover such variants of 453
recombined photosynthesis could be further optimized by laboratory evolution within a 454
suitable microbial chassis However such recombined photosynthetic variants cannot be 455
considered a truly novel type of photosynthesis because they would only bring preexisting 456
pieces together that evolution has separated Nevertheless they could be an important step 457
towards the ambitious goal to design truly novel ldquosynthetic photosynthetic modulesrdquo that 458
contain more efficient substitutes of the ldquofrozen metabolic accidentsrdquo discussed above 459
Ample proof of functionality for in-vivo hybrids (between photosynthesis and 460
previously unconnected metabolic pathways) and in-vitro hybrids (between PSI and biotic or 461
abiotic catalysts) has been obtained but such systems will only be commercially successful if 462
they can compete with established non-biological systems Tailoring of PSI in cyanobacteria 463
where techniques like gene replacement and gene modification are routine may contribute to 464
further improving the efficiency and robustness of in vitro and in vivo hybrids One 465
promising route could be to identify those parts of the original PSI (which evolved under 466
constraints imposed by the cyanobacterial cell) that are necessary for hybrid devices (a 467
ldquominimalrdquo PSI) Such bio-nano systems can be optimized to include novel non-biological 468
components that replace or complement natural pigments andor the protein-based backbone 469
of photosystems going far beyond the limited toolbox of Naturersquos chemistry Such novel 470
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20
systems inspired by natural photosynthesis could be used to engage biologists in the design 471
of fundamentally different types of photosynthesis in living organisms 472
473
SUPPLEMENTAL DATA 474
Supplemental Table 1 Absencepresence of photosynthetic proteins in the three model 475
species Synechocystis PCC6803 (Syn) Chlamydomonas reinhardtii (Cr) and Arabidopsis 476
thaliana (At) 477
478
ACKNOWLEDGMENTS 479
The authors thank Paul Hardy for critical reading of the manuscript 480
481
482
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21
Table 1 Replacement of conserved individual or multiple photosynthetic proteins 483
GeneProtein Description Protein
identity
Reference
psbAD1 Synechocystis D1 was replaced by its homolog from
Poa annua which resulted in slower growth This is
likely to be due to increased charge recombination
between the donor and acceptor sides of the reaction
center
86 Nixon et al
1991
psbBCP47 Synechocystis CP47 was replaced by its homolog
from spinach and photoautotrophy was lost
80 Vermaas et
al 1996
psbCCP43 Synechocystis CP43 was replaced by its homolog
from spinach and photoautotrophy was lost
85 Carpenter et
al 1993
psbHPsbH Synechocystis PsbH was replaced by its counterpart
from maize The resulting strain displayed increased
light sensitivity and lower chlorophyll content
78 Chiaramonte
et al 1999
psaAPsaA Synechocystis PsaA was replaced by its equivalent
from A thaliana This resulted in reduced photo-
autotrophical growth and a drastically reduced
ChlPC ratio
80 Viola et al
2014
psbABCDEF
D1CP47CP43D2
Cyt b559-+
All six core subunits of C reinhardtii were replaced
by their counterparts from two different green algae
(V carteri and S obliquus) The resulting strains
were photoautotrophic but showed reduced
photosynthetic efficiency and the heterologous
82 -
99
Gimpel et al
2016
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22
proteins reached only between 10 and 20 of the
levels of those they replaced
484
485
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23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
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24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
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25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
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26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
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28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
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32
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566
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Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
chloroplast-ferredoxin-hydrogenase system Proc Natl Acad Sci U S A 70 2317-2320 571
Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
complements ferredoxin deficiency in knocked-down transgenic tobacco plants Plant 574
J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
photosynthesis for energy production Curr Opin Chem Biol 17 457-461 577
Burgdorf T Lenz O Buhrke T van der Linden E Jones AK Albracht SP Friedrich B 578
(2005) [NiFe]-hydrogenases of Ralstonia eutropha H16 modular enzymes for 579
oxygen-tolerant biological hydrogen oxidation J Mol Microbiol Biotechnol 10 181-580
96 581
Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
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nanoparticle antennas Nano Lett 10 2069-2074 584
Carpenter SD Ohad I Vermaas WF (1993) Analysis of chimeric spinachcyanobacterial 585
CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
the water-splitting system of Photosystem II Biochim Biophys Acta 1144 204-212 587
Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
Eur J Biochem 260 833-843 593
Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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33
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Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
by thermal dissipation of excess energy Biochem Soc Trans 38 651-660 608
Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
device by direct chemical binding of the photosynthetic reaction center protein to 610
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13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
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Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
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Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
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R Kargul JM (2018) Molecular mechanisms of photoadaptation of photosystem I 639
supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
harvesting chlorophyll ab-binding protein in Synechocystis sp PCC 6803 Eur J 643
Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
synthase is a highly divergent paralog of PsbA of photosystem II Science 353 646
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Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
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Olmos JD Kargul J (2015) A quest for the artificial leaf Int J Biochem Cell Biol 656
66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
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c553 minimises charge recombination and enhances photovoltaic performance of the 660
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ACS Chem Biol 6 533-539 663
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35
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Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip 666
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2872-2873 668
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its application in biomimetic solar-to-fuel systems J Plant Physiol 169 1639-1653 670
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Improving photosynthesis and crop productivity by accelerating recovery from 681
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Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
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Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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36
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Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
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by engineering crop photosynthesis and yield potential Cell 161 56-66 703
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Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
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Proc Natl Acad Sci U S A 108 20988-20991 710
Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
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production Biochemistry 49 10264-10266 713
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503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
hydrogenases J Biochem 123 644-649 718
Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
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Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous 722
enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
Y Nishihara H (2010) A photosensing system composed of photosystem I 725
molecular wire gold nanoparticle and double surfactants in water Chem Commun 726
(Camb) 46 2557-2559 727
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
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fabrication of a bio-photoelectrode J Nanosci Nanotechnol 9 1722-1726 730
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Molina-Heredia FP Wastl J Navarro JA Bendall DS Hervas M Howe CJ De La Rosa 731
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low-light stress J Exp Bot 56 389-393 734
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J 735
Nanosci Nanotechnol 9 1709-1713 736
Nguyen K Bruce BD (2014) Growing green electricity progress and strategies for use of 737
photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello 742
Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in 748
understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in 750
Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
complex Plant Cell 3 383-395 752
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
S Cazzaniga S Bassi R (2015) Heterologous expression of moss light-harvesting 764
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38
complex stress-related 1 (LHCSR1) the chlorophyll a-xanthophyll pigment-protein 765
complex catalyzing non-photochemical quenching in Nicotiana sp J Biol Chem 290 766
24340-24354 767
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins 768
Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
phosphatase TAP38 in LHCII dephosphorylation and thylakoid electron flow PLoS 771
Biol 8 e1000288 772
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
natural product biosynthesis Protoplasma 253 1197-1209 774
Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS 775
Lett 581 2768-2775 776
Schiffels J Pinkenburg O Schelden M Aboulnaga el-HA Baumann ME Selmer T 777
(2013) An innovative cloning platform enables large-scale production and maturation 778
of an oxygen-tolerant [NiFe]-hydrogenase from Cupriavidus necator in Escherichia 779
coli PLoS One 8 e6881 780
Schmid VH (2008) Light-harvesting complexes of vascular plants Cell Mol Life Sci 65 781
3619-3639 782
Shi T Bibby TS Jiang L Irwin AJ Falkowski PG (2005) Protein interactions limit the 783
rate of evolution of photosynthetic genes in cyanobacteria Mol Biol Evol 22 2179-784
2189 785
Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS 786
Protein Increases Electron Transport Rates and Biomass Yield Plant Physiol 175 787
134-145 788
Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J 789
(2017) Plasmon-induced absorption of blind chlorophylls in photosynthetic proteins 790
assembled on silver nanowires Nanoscale 9 10475-10486 791
792
Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
Sakai M Fujii M Tohri A Iwai M Inoue Y Yoneyama S Minakata M Enami I 794
(2009) Plugging a molecular wire into photosystem I reconstitution of the 795
photoelectric conversion system on a gold electrode Angew Chem Int Ed Engl 48 796
1585-1587 797
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Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M 798
Iwai M Taguchi S Enami I Inoue Y Yamanoi Y Yonezawa T Mizuno K 799
Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M 800
(2007) Bio-photosensor Cyanobacterial photosystem I coupled with transistor via 801
molecular wire Biochim Biophys Acta 1767 653-659 802
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N 803
(2006) Functional replacement of ferredoxin by a cyanobacterial flavodoxin in 804
tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050 805
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
U S A 104 11495-11500 809
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M 810
Norici A Shotland Y Ohad I Kaplan A (2016) The mechanisms whereby the 811
green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled 812
photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
Photosystem I-catalyst hybrids Curr Opin Chem Biol 25 1-8 815
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium 816
Synechocystis sp PCC 6803 carrying spinach sequences Construction and function 817
Photosynth Res 48 147-162 818
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene 819
replacement in Synechocystis sp PCC 6803 Microb Cell Fact 13 4 820
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
thaliana J Biol Chem 278 31286-31289 826
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M 827
Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
dependent pathways into Synechocystis sp PCC 6803 Metab Eng 33 1-11 830
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40
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functional photosystem II complexes of cyanobacteria Proc Natl Acad Sci U S A 98 832
14168-14173 833
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) 834
Photosynthetic electron partitioning between [FeFe]-hydrogenase and 835
ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S 836
A 108 9396-9401 837
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of 838
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(2018) Ectopic expression of SsPETE2 a plastocyanin from Suaeda salsa improves 841
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843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
16
materials immobilizationorientation strategies andor artificial redox mediators (Nguyen and 371
Bruce 2014 Janna Olmos and Kargul 2015 Plumereacute and Nowaczyk 2017 Kargul et al 372
2018) PSI must be immobilized on the electrode surface in such a way that electron transfers 373
between the electrodes and the oxidizing (P700) and reducing (FB - the terminal [4Fe-4S] 374
cluster or an intermediate electron transporter) sites of PSI can proceed with the required 375
efficiency Electrons are transferred between the electrodes and the oxidizing or reducing 376
sides of PSI either by a diffusible redox mediator or molecular wires Examples of electrode 377
materials and redox mediators are provided in Table 4 After P700 photo-excitation electrons 378
are transferred from P700 via several factors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB) to the 379
iron-sulfur cluster FB (see legend of Box 1) As in the case of PSI-hydrogenase and PSI-380
platinum nanoparticles PSI can be wired to its electrodes This has been achieved by wiring 381
the A1 cofactor (phylloquinone) to the substrate surface such that electrons are directly 382
transferred from A1 to the electrode thus bypassing the downstream FeS clusters (FX FA FB) 383
in the stromal domain of PSI (Terasaki et al 2007 Miyachi et al 2009 Terasaki et al 384
2009 Miyachi et al 2010) 385
Modifications of PSI have been utilized to enhance the efficiency of the photocurrent-386
generating system (Das et al 2004 Frolov et al 2005 Carmeli et al 2010) As mentioned 387
previously fusions to the stroma-faced PSI subunit PsaE can be used to link new components 388
to PSI however in this case PsaD fusions were used To this end recombinant His-tagged 389
PsaD was immobilized on the functionalized electrode surface which was then exposed to 390
native PSI complexes resulting in immobilized PSI with P700 facing away from the 391
electrode (Das et al 2004) Another way to control the orientation of PSI during 392
immobilization involves introducing cysteine mutations To allow for direct thiol coupling to 393
an Au surface various residues on the lumen-exposed face of PSI were replaced by cysteine 394
and tested (Frolov et al 2005) PSI attachment was achieved with all single mutants even 395
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17
those placed further from the P700 site suggesting that a specific location is not required as 396
long as the cysteine is exposed at the luminal surface of PSI The concept of targeted 397
attachment via introduced cysteine residues was exploited in subsequent studies to link PSI to 398
maleimide-functionalized gallium arsenide (Frolov et al 2008) to immobilize PSI between 399
the substrate and a metallized scanning near-field optical microscopy tip (Gerster et al 400
2012) and to bind PSI to carbon nanotubes (Kaniber et al 2010) Another modification of 401
PSI is represented by the attachment of plasmonic metal nanoparticles which resulted in 402
enhanced light absorption (Carmeli et al 2010) even in the green part of the solar spectrum 403
that is not normally absorbed (Szalkowski et al 2017) This suggests that it is possible to 404
enhance light absorption by PSI in vitro through the attachment of abiotic components that 405
act as optical antennae to extend the spectrum of photons available for P700 activation 406
Taken together these efforts demonstrate that PSI-based photocurrent-generating 407
systems are still in an exploratory phase with many variants under development In the next 408
phase viable building blocks and reference systems should be established that can serve as 409
starting points for the systematic engineering of superior systems This will require the 410
modification of PSI for optimal effect in artificial systems and will undoubtedly differ 411
substantially from the original environment in which PSI was molded by biological 412
evolution 413
414
Concluding remarks and outlook 415
Enhancing photosynthesis and growth can be achieved by a simple overexpression of certain 416
photosynthetic proteins and PSI can be coupled to previously unconnected biotic or abiotic 417
components to generate valuable compounds hydrogen or electricity Moreover entire 418
photosynthetic complexes can be functionally expressed in distantly related species (as 419
demonstrated for RuBisCO Aigner et al 2017) Thus what are the next goals and which 420
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18
challenges need to be overcome Two challenges for the in vivo systems are obvious (i) 421
enhancing the efficiency of in-vivo bio-bio hybrids and (ii) upscaling the size of ldquosynthetic 422
photosynthetic modulesrdquo to cover entire photosystems or complex antenna systems 423
With respect to the enhancement of in vivo cyanobacterial and algal systems 424
harboring hybrid configurations in which photosynthesis directly drives previously 425
unconnected pathways the use of laboratory evolution offers a unique opportunity to tailor 426
these systems for their intended purpose Laboratory evolution utilizes the high rate of 427
evolution typical in microbial systems (in particular if suitable selection conditions can be 428
designed) to fine tune and optimize processes through selection of advantageous genetic 429
variation While this strategy has been employed in E coli and yeast with impressive success 430
now photosynthetic microbial systems are emerging as attractive targets for this approach 431
(Leister 2017) 432
The exchange of entire multiprotein complexes between distantly related species will 433
not be a simple exercise because the ldquofrozen metabolic staterdquo of the core photosynthetic 434
complexes will necessitate the exchange of major parts of photosystems rather than 435
individual subunits The RuBisCO case study by Aigner et al (2017) represents of promising 436
proof of principle but one needs to consider that the synthetic RuBisCO module comprised 437
only the two different subunits present in the mature complex and five auxiliary factors for its 438
assembly Entire photosystems will require much larger ldquosynthetic photosynthetic modulesrdquo 439
and many of the auxiliary factors have not been identified yet Therefore when designing 440
these complex ldquosynthetic photosynthetic modulesrdquo we will identify the set of components 441
that are sufficient (and not only necessary) to drive photosynthesis providing an 442
unprecedentedly deep understanding of this fundamental and complex process 443
Given that the problems described above can be solved what will be the next steps in 444
the synthetic biology of the light reactions of photosynthesis The combination of ldquosynthetic 445
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19
photosynthetic modulesrdquo from diverse species could allow the design of novel variants of 446
photosynthesis Numerous instances of such ldquorecombined photosynthetic variantsrdquo can be 447
imagined including plants that employ cyanobacteria-derived phycobilisomes for highly 448
sufficient photosynthesis under low light conditions cyanobacteria that employ plant-derived 449
LHCs as antenna to shift light saturation of photosynthesis to higher intensities or the 450
integration of cyanobacterial Chl d and Chl f (which can absorb far-red and near infra-red 451
light) into algal or plant photosynthesis to expand the spectral region available to drive 452
photosynthesis (Loughlin et al 2013 Ho et al 2016) Moreover such variants of 453
recombined photosynthesis could be further optimized by laboratory evolution within a 454
suitable microbial chassis However such recombined photosynthetic variants cannot be 455
considered a truly novel type of photosynthesis because they would only bring preexisting 456
pieces together that evolution has separated Nevertheless they could be an important step 457
towards the ambitious goal to design truly novel ldquosynthetic photosynthetic modulesrdquo that 458
contain more efficient substitutes of the ldquofrozen metabolic accidentsrdquo discussed above 459
Ample proof of functionality for in-vivo hybrids (between photosynthesis and 460
previously unconnected metabolic pathways) and in-vitro hybrids (between PSI and biotic or 461
abiotic catalysts) has been obtained but such systems will only be commercially successful if 462
they can compete with established non-biological systems Tailoring of PSI in cyanobacteria 463
where techniques like gene replacement and gene modification are routine may contribute to 464
further improving the efficiency and robustness of in vitro and in vivo hybrids One 465
promising route could be to identify those parts of the original PSI (which evolved under 466
constraints imposed by the cyanobacterial cell) that are necessary for hybrid devices (a 467
ldquominimalrdquo PSI) Such bio-nano systems can be optimized to include novel non-biological 468
components that replace or complement natural pigments andor the protein-based backbone 469
of photosystems going far beyond the limited toolbox of Naturersquos chemistry Such novel 470
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20
systems inspired by natural photosynthesis could be used to engage biologists in the design 471
of fundamentally different types of photosynthesis in living organisms 472
473
SUPPLEMENTAL DATA 474
Supplemental Table 1 Absencepresence of photosynthetic proteins in the three model 475
species Synechocystis PCC6803 (Syn) Chlamydomonas reinhardtii (Cr) and Arabidopsis 476
thaliana (At) 477
478
ACKNOWLEDGMENTS 479
The authors thank Paul Hardy for critical reading of the manuscript 480
481
482
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21
Table 1 Replacement of conserved individual or multiple photosynthetic proteins 483
GeneProtein Description Protein
identity
Reference
psbAD1 Synechocystis D1 was replaced by its homolog from
Poa annua which resulted in slower growth This is
likely to be due to increased charge recombination
between the donor and acceptor sides of the reaction
center
86 Nixon et al
1991
psbBCP47 Synechocystis CP47 was replaced by its homolog
from spinach and photoautotrophy was lost
80 Vermaas et
al 1996
psbCCP43 Synechocystis CP43 was replaced by its homolog
from spinach and photoautotrophy was lost
85 Carpenter et
al 1993
psbHPsbH Synechocystis PsbH was replaced by its counterpart
from maize The resulting strain displayed increased
light sensitivity and lower chlorophyll content
78 Chiaramonte
et al 1999
psaAPsaA Synechocystis PsaA was replaced by its equivalent
from A thaliana This resulted in reduced photo-
autotrophical growth and a drastically reduced
ChlPC ratio
80 Viola et al
2014
psbABCDEF
D1CP47CP43D2
Cyt b559-+
All six core subunits of C reinhardtii were replaced
by their counterparts from two different green algae
(V carteri and S obliquus) The resulting strains
were photoautotrophic but showed reduced
photosynthetic efficiency and the heterologous
82 -
99
Gimpel et al
2016
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22
proteins reached only between 10 and 20 of the
levels of those they replaced
484
485
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23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
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24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
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26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
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28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
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32
References 565
566
Aigner H Wilson RH Bracher A Calisse L Bhat JY Hartl FU Hayer-Hartl M (2017) 567
Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
chloroplast-ferredoxin-hydrogenase system Proc Natl Acad Sci U S A 70 2317-2320 571
Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
complements ferredoxin deficiency in knocked-down transgenic tobacco plants Plant 574
J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
photosynthesis for energy production Curr Opin Chem Biol 17 457-461 577
Burgdorf T Lenz O Buhrke T van der Linden E Jones AK Albracht SP Friedrich B 578
(2005) [NiFe]-hydrogenases of Ralstonia eutropha H16 modular enzymes for 579
oxygen-tolerant biological hydrogen oxidation J Mol Microbiol Biotechnol 10 181-580
96 581
Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
(2010) Broad band enhancement of light absorption in photosystem I by metal 583
nanoparticle antennas Nano Lett 10 2069-2074 584
Carpenter SD Ohad I Vermaas WF (1993) Analysis of chimeric spinachcyanobacterial 585
CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
the water-splitting system of Photosystem II Biochim Biophys Acta 1144 204-212 587
Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
Eur J Biochem 260 833-843 593
Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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33
Ciornii D Riedel M Stieger KR Feifel SC Hejazi M Lokstein H Zouni A Lisdat F 598
(2017) Bioelectronic Circuit on a 3D Electrode Architecture Enzymatic Catalysis 599
Interconnected with Photosystem I J Am Chem Soc 139 16478-16481 600
Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel 601
genetic diversity Philos Trans R Soc Lond B Biol Sci 372 602
Das R Kiley PJ Segal M Norville J Yu AA Wang L Trammell SA Reddick LE 603
Kumar R Stellacci F Lebedev N Schnur J Bruce BD Zhang S Baldo M (2004) 604
Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
by thermal dissipation of excess energy Biochem Soc Trans 38 651-660 608
Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
device by direct chemical binding of the photosynthetic reaction center protein to 610
metal surfaces Advanced Materials 17 2434-2437 611
Frolov L Rosenwaks Y Richter S Carmeli C Carmeli I (2008) Photoelectric junctions 612
between GaAs and photosynthetic reaction center protein J Phys Chem C 112 613
13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I 617
Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
reinhardtii ACS Synth Biol 5 589-596 624
Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
state biophotovoltaic cells containing photosystem I Adv Mater 26 4863-4869 630
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Glowacka K Kromdijk J Kucera K Xie J Cavanagh AP Leonelli L Leakey ADB Ort 631
DR Niyogi KK Long SP (2018) Photosystem II subunit S overexpression increases 632
the efficiency of water use in a field-grown crop Nat Commun 9 868 633
Gnanasekaran T Karcher D Nielsen AZ Martens HJ Ruf S Kroop X Olsen CE 634
Motawie MS Pribil M Moller BL Bock R Jensen PE (2016) Transfer of the 635
cytochrome P450-dependent dhurrin pathway from Sorghum bicolor into Nicotiana 636
tabacum chloroplasts for light-driven synthesis J Exp Bot 67 2495-2506 637
Haniewicz P Abram M Nosek L Kirkpatrick J El-Mohsnawy E Olmos JDJ Kouřil 638
R Kargul JM (2018) Molecular mechanisms of photoadaptation of photosystem I 639
supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
harvesting chlorophyll ab-binding protein in Synechocystis sp PCC 6803 Eur J 643
Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
synthase is a highly divergent paralog of PsbA of photosystem II Science 353 646
Holt NE Fleming GR Niyogi KK (2004) Toward an understanding of the mechanism of 647
nonphotochemical quenching in green plants Biochemistry 43 8281-8289 648
Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
D Kamachi T Okura I (2006a) Light-driven hydrogen production by a hybrid 650
complex of a [NiFe]-hydrogenase and the cyanobacterial photosystem I Photochem 651
Photobiol 82 676-682 652
Ihara M Nakamoto H Kamachi T Okura I Maeda M (2006b) Photoinduced hydrogen 653
production by direct electron transfer from photosystem I cross-linked with 654
cytochrome c3 to [NiFe]-hydrogenase Photochem Photobiol 82 1677-1685Janna 655
Olmos JD Kargul J (2015) A quest for the artificial leaf Int J Biochem Cell Biol 656
66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
Pawlak D Kargul J (2017) Biofunctionalisation of p-doped silicon with cytochrome 659
c553 minimises charge recombination and enhances photovoltaic performance of the 660
all-solid-state photosystem I-based biophotoelectrode RSC Adv 7 47854-47866 661
Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations 662
ACS Chem Biol 6 533-539 663
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35
Jensen PE Leister D (2014) Chloroplast evolution structure and functions F1000Prime 664
Rep 6 40 665
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip 666
functionalization of carbon nanotubes with photosystem I J Am Chem Soc 132 667
2872-2873 668
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and 669
its application in biomimetic solar-to-fuel systems J Plant Physiol 169 1639-1653 670
Kargul J Bubak G Andryianau G (2018) Biophotovoltaic systems based on 671
photosynthetic complexes In Wandelt K (Ed) Encyclopedia of Interfacial 672
Chemistry Surface Science and Electrochemistry vol 7 pp 43-63 673
Kim YS Hara M Ikebukuro K Miyake J Ohkawa H Karube I (1996) Photo-induced 674
activation of cytochrome P450reductase fusion enzyme coupled with spinach 675
chloroplasts Biotechnol Tech 10 717minus720 676
Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic 677
hydrogen production by a hybrid complex of photosystem I and [NiFe]-hydrogenase 678
ACS Nano 3 4055-4061 679
Kromdijk J Glowacka K Leonelli L Gabilly ST Iwai M Niyogi KK Long SP (2016) 680
Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
Kubota H Sakurai I Katayama K Mizusawa N Ohashi S Kobayashi M Zhang P Aro 683
EM Wada H (2010) Purification and characterization of photosystem I complex 684
from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim 685
Biophys Acta 1797 98-105 686
Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future 702
by engineering crop photosynthesis and yield potential Cell 161 56-66 703
Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
(2011) Solar hydrogen-producing bionanodevice outperforms natural photosynthesis 709
Proc Natl Acad Sci U S A 108 20988-20991 710
Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
production Biochemistry 49 10264-10266 713
Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
organisms using whole-cell and cell-free systems Appl Biochem Biotechnol 183 715
503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
hydrogenases J Biochem 123 644-649 718
Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
(2016) Fusion of ferredoxin and cytochrome P450 enables direct light-driven 720
biosynthesis ACS Chem Biol 11 1862-1869 721
Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous 722
enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
Y Nishihara H (2010) A photosensing system composed of photosystem I 725
molecular wire gold nanoparticle and double surfactants in water Chem Commun 726
(Camb) 46 2557-2559 727
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
(2009) Surface immobilization of PSI using vitamin K1-like molecular wires for 729
fabrication of a bio-photoelectrode J Nanosci Nanotechnol 9 1722-1726 730
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37
Molina-Heredia FP Wastl J Navarro JA Bendall DS Hervas M Howe CJ De La Rosa 731
MA (2003) Photosynthesis a new function for an old cytochrome Nature 424 33-34 732
Mullineaux CW Emlyn-Jones D (2005) State transitions an example of acclimation to 733
low-light stress J Exp Bot 56 389-393 734
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J 735
Nanosci Nanotechnol 9 1709-1713 736
Nguyen K Bruce BD (2014) Growing green electricity progress and strategies for use of 737
photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello 742
Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in 748
understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in 750
Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
complex Plant Cell 3 383-395 752
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
S Cazzaniga S Bassi R (2015) Heterologous expression of moss light-harvesting 764
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38
complex stress-related 1 (LHCSR1) the chlorophyll a-xanthophyll pigment-protein 765
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24340-24354 767
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins 768
Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
phosphatase TAP38 in LHCII dephosphorylation and thylakoid electron flow PLoS 771
Biol 8 e1000288 772
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
natural product biosynthesis Protoplasma 253 1197-1209 774
Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS 775
Lett 581 2768-2775 776
Schiffels J Pinkenburg O Schelden M Aboulnaga el-HA Baumann ME Selmer T 777
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of an oxygen-tolerant [NiFe]-hydrogenase from Cupriavidus necator in Escherichia 779
coli PLoS One 8 e6881 780
Schmid VH (2008) Light-harvesting complexes of vascular plants Cell Mol Life Sci 65 781
3619-3639 782
Shi T Bibby TS Jiang L Irwin AJ Falkowski PG (2005) Protein interactions limit the 783
rate of evolution of photosynthetic genes in cyanobacteria Mol Biol Evol 22 2179-784
2189 785
Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS 786
Protein Increases Electron Transport Rates and Biomass Yield Plant Physiol 175 787
134-145 788
Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J 789
(2017) Plasmon-induced absorption of blind chlorophylls in photosynthetic proteins 790
assembled on silver nanowires Nanoscale 9 10475-10486 791
792
Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
Sakai M Fujii M Tohri A Iwai M Inoue Y Yoneyama S Minakata M Enami I 794
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1585-1587 797
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39
Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M 798
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Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M 800
(2007) Bio-photosensor Cyanobacterial photosystem I coupled with transistor via 801
molecular wire Biochim Biophys Acta 1767 653-659 802
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N 803
(2006) Functional replacement of ferredoxin by a cyanobacterial flavodoxin in 804
tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050 805
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
U S A 104 11495-11500 809
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M 810
Norici A Shotland Y Ohad I Kaplan A (2016) The mechanisms whereby the 811
green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled 812
photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
Photosystem I-catalyst hybrids Curr Opin Chem Biol 25 1-8 815
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium 816
Synechocystis sp PCC 6803 carrying spinach sequences Construction and function 817
Photosynth Res 48 147-162 818
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene 819
replacement in Synechocystis sp PCC 6803 Microb Cell Fact 13 4 820
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
thaliana J Biol Chem 278 31286-31289 826
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M 827
Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
dependent pathways into Synechocystis sp PCC 6803 Metab Eng 33 1-11 830
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40
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in 831
functional photosystem II complexes of cyanobacteria Proc Natl Acad Sci U S A 98 832
14168-14173 833
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) 834
Photosynthetic electron partitioning between [FeFe]-hydrogenase and 835
ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S 836
A 108 9396-9401 837
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of 838
alternative electron flow by flavodiiron proteins in Arabidopsis Nat Plants 2 16012 839
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ 840
(2018) Ectopic expression of SsPETE2 a plastocyanin from Suaeda salsa improves 841
plant tolerance to oxidative stress Plant Sci 268 1-10 842
843
844
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wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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Copyright copy 2018 American Society of Plant Biologists All rights reserved
Google Scholar Author Only Title Only Author and Title
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in functional photosystem II complexes ofcyanobacteria Proc Natl Acad Sci U S A 98 14168-14173
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) Photosynthetic electron partitioning between [FeFe]-hydrogenase and ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S A 108 9396-9401
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of alternative electron flow by flavodiiron proteins inArabidopsis Nat Plants 2 16012
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ (2018) Ectopic expression of SsPETE2 a plastocyanin fromSuaeda salsa improves plant tolerance to oxidative stress Plant Sci 268 1-10
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
17
those placed further from the P700 site suggesting that a specific location is not required as 396
long as the cysteine is exposed at the luminal surface of PSI The concept of targeted 397
attachment via introduced cysteine residues was exploited in subsequent studies to link PSI to 398
maleimide-functionalized gallium arsenide (Frolov et al 2008) to immobilize PSI between 399
the substrate and a metallized scanning near-field optical microscopy tip (Gerster et al 400
2012) and to bind PSI to carbon nanotubes (Kaniber et al 2010) Another modification of 401
PSI is represented by the attachment of plasmonic metal nanoparticles which resulted in 402
enhanced light absorption (Carmeli et al 2010) even in the green part of the solar spectrum 403
that is not normally absorbed (Szalkowski et al 2017) This suggests that it is possible to 404
enhance light absorption by PSI in vitro through the attachment of abiotic components that 405
act as optical antennae to extend the spectrum of photons available for P700 activation 406
Taken together these efforts demonstrate that PSI-based photocurrent-generating 407
systems are still in an exploratory phase with many variants under development In the next 408
phase viable building blocks and reference systems should be established that can serve as 409
starting points for the systematic engineering of superior systems This will require the 410
modification of PSI for optimal effect in artificial systems and will undoubtedly differ 411
substantially from the original environment in which PSI was molded by biological 412
evolution 413
414
Concluding remarks and outlook 415
Enhancing photosynthesis and growth can be achieved by a simple overexpression of certain 416
photosynthetic proteins and PSI can be coupled to previously unconnected biotic or abiotic 417
components to generate valuable compounds hydrogen or electricity Moreover entire 418
photosynthetic complexes can be functionally expressed in distantly related species (as 419
demonstrated for RuBisCO Aigner et al 2017) Thus what are the next goals and which 420
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18
challenges need to be overcome Two challenges for the in vivo systems are obvious (i) 421
enhancing the efficiency of in-vivo bio-bio hybrids and (ii) upscaling the size of ldquosynthetic 422
photosynthetic modulesrdquo to cover entire photosystems or complex antenna systems 423
With respect to the enhancement of in vivo cyanobacterial and algal systems 424
harboring hybrid configurations in which photosynthesis directly drives previously 425
unconnected pathways the use of laboratory evolution offers a unique opportunity to tailor 426
these systems for their intended purpose Laboratory evolution utilizes the high rate of 427
evolution typical in microbial systems (in particular if suitable selection conditions can be 428
designed) to fine tune and optimize processes through selection of advantageous genetic 429
variation While this strategy has been employed in E coli and yeast with impressive success 430
now photosynthetic microbial systems are emerging as attractive targets for this approach 431
(Leister 2017) 432
The exchange of entire multiprotein complexes between distantly related species will 433
not be a simple exercise because the ldquofrozen metabolic staterdquo of the core photosynthetic 434
complexes will necessitate the exchange of major parts of photosystems rather than 435
individual subunits The RuBisCO case study by Aigner et al (2017) represents of promising 436
proof of principle but one needs to consider that the synthetic RuBisCO module comprised 437
only the two different subunits present in the mature complex and five auxiliary factors for its 438
assembly Entire photosystems will require much larger ldquosynthetic photosynthetic modulesrdquo 439
and many of the auxiliary factors have not been identified yet Therefore when designing 440
these complex ldquosynthetic photosynthetic modulesrdquo we will identify the set of components 441
that are sufficient (and not only necessary) to drive photosynthesis providing an 442
unprecedentedly deep understanding of this fundamental and complex process 443
Given that the problems described above can be solved what will be the next steps in 444
the synthetic biology of the light reactions of photosynthesis The combination of ldquosynthetic 445
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19
photosynthetic modulesrdquo from diverse species could allow the design of novel variants of 446
photosynthesis Numerous instances of such ldquorecombined photosynthetic variantsrdquo can be 447
imagined including plants that employ cyanobacteria-derived phycobilisomes for highly 448
sufficient photosynthesis under low light conditions cyanobacteria that employ plant-derived 449
LHCs as antenna to shift light saturation of photosynthesis to higher intensities or the 450
integration of cyanobacterial Chl d and Chl f (which can absorb far-red and near infra-red 451
light) into algal or plant photosynthesis to expand the spectral region available to drive 452
photosynthesis (Loughlin et al 2013 Ho et al 2016) Moreover such variants of 453
recombined photosynthesis could be further optimized by laboratory evolution within a 454
suitable microbial chassis However such recombined photosynthetic variants cannot be 455
considered a truly novel type of photosynthesis because they would only bring preexisting 456
pieces together that evolution has separated Nevertheless they could be an important step 457
towards the ambitious goal to design truly novel ldquosynthetic photosynthetic modulesrdquo that 458
contain more efficient substitutes of the ldquofrozen metabolic accidentsrdquo discussed above 459
Ample proof of functionality for in-vivo hybrids (between photosynthesis and 460
previously unconnected metabolic pathways) and in-vitro hybrids (between PSI and biotic or 461
abiotic catalysts) has been obtained but such systems will only be commercially successful if 462
they can compete with established non-biological systems Tailoring of PSI in cyanobacteria 463
where techniques like gene replacement and gene modification are routine may contribute to 464
further improving the efficiency and robustness of in vitro and in vivo hybrids One 465
promising route could be to identify those parts of the original PSI (which evolved under 466
constraints imposed by the cyanobacterial cell) that are necessary for hybrid devices (a 467
ldquominimalrdquo PSI) Such bio-nano systems can be optimized to include novel non-biological 468
components that replace or complement natural pigments andor the protein-based backbone 469
of photosystems going far beyond the limited toolbox of Naturersquos chemistry Such novel 470
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20
systems inspired by natural photosynthesis could be used to engage biologists in the design 471
of fundamentally different types of photosynthesis in living organisms 472
473
SUPPLEMENTAL DATA 474
Supplemental Table 1 Absencepresence of photosynthetic proteins in the three model 475
species Synechocystis PCC6803 (Syn) Chlamydomonas reinhardtii (Cr) and Arabidopsis 476
thaliana (At) 477
478
ACKNOWLEDGMENTS 479
The authors thank Paul Hardy for critical reading of the manuscript 480
481
482
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21
Table 1 Replacement of conserved individual or multiple photosynthetic proteins 483
GeneProtein Description Protein
identity
Reference
psbAD1 Synechocystis D1 was replaced by its homolog from
Poa annua which resulted in slower growth This is
likely to be due to increased charge recombination
between the donor and acceptor sides of the reaction
center
86 Nixon et al
1991
psbBCP47 Synechocystis CP47 was replaced by its homolog
from spinach and photoautotrophy was lost
80 Vermaas et
al 1996
psbCCP43 Synechocystis CP43 was replaced by its homolog
from spinach and photoautotrophy was lost
85 Carpenter et
al 1993
psbHPsbH Synechocystis PsbH was replaced by its counterpart
from maize The resulting strain displayed increased
light sensitivity and lower chlorophyll content
78 Chiaramonte
et al 1999
psaAPsaA Synechocystis PsaA was replaced by its equivalent
from A thaliana This resulted in reduced photo-
autotrophical growth and a drastically reduced
ChlPC ratio
80 Viola et al
2014
psbABCDEF
D1CP47CP43D2
Cyt b559-+
All six core subunits of C reinhardtii were replaced
by their counterparts from two different green algae
(V carteri and S obliquus) The resulting strains
were photoautotrophic but showed reduced
photosynthetic efficiency and the heterologous
82 -
99
Gimpel et al
2016
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22
proteins reached only between 10 and 20 of the
levels of those they replaced
484
485
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23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
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24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
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26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
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28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
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32
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566
Aigner H Wilson RH Bracher A Calisse L Bhat JY Hartl FU Hayer-Hartl M (2017) 567
Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
chloroplast-ferredoxin-hydrogenase system Proc Natl Acad Sci U S A 70 2317-2320 571
Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
complements ferredoxin deficiency in knocked-down transgenic tobacco plants Plant 574
J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
photosynthesis for energy production Curr Opin Chem Biol 17 457-461 577
Burgdorf T Lenz O Buhrke T van der Linden E Jones AK Albracht SP Friedrich B 578
(2005) [NiFe]-hydrogenases of Ralstonia eutropha H16 modular enzymes for 579
oxygen-tolerant biological hydrogen oxidation J Mol Microbiol Biotechnol 10 181-580
96 581
Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
(2010) Broad band enhancement of light absorption in photosystem I by metal 583
nanoparticle antennas Nano Lett 10 2069-2074 584
Carpenter SD Ohad I Vermaas WF (1993) Analysis of chimeric spinachcyanobacterial 585
CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
the water-splitting system of Photosystem II Biochim Biophys Acta 1144 204-212 587
Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
Eur J Biochem 260 833-843 593
Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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33
Ciornii D Riedel M Stieger KR Feifel SC Hejazi M Lokstein H Zouni A Lisdat F 598
(2017) Bioelectronic Circuit on a 3D Electrode Architecture Enzymatic Catalysis 599
Interconnected with Photosystem I J Am Chem Soc 139 16478-16481 600
Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel 601
genetic diversity Philos Trans R Soc Lond B Biol Sci 372 602
Das R Kiley PJ Segal M Norville J Yu AA Wang L Trammell SA Reddick LE 603
Kumar R Stellacci F Lebedev N Schnur J Bruce BD Zhang S Baldo M (2004) 604
Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
by thermal dissipation of excess energy Biochem Soc Trans 38 651-660 608
Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
device by direct chemical binding of the photosynthetic reaction center protein to 610
metal surfaces Advanced Materials 17 2434-2437 611
Frolov L Rosenwaks Y Richter S Carmeli C Carmeli I (2008) Photoelectric junctions 612
between GaAs and photosynthetic reaction center protein J Phys Chem C 112 613
13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I 617
Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
reinhardtii ACS Synth Biol 5 589-596 624
Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
state biophotovoltaic cells containing photosystem I Adv Mater 26 4863-4869 630
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34
Glowacka K Kromdijk J Kucera K Xie J Cavanagh AP Leonelli L Leakey ADB Ort 631
DR Niyogi KK Long SP (2018) Photosystem II subunit S overexpression increases 632
the efficiency of water use in a field-grown crop Nat Commun 9 868 633
Gnanasekaran T Karcher D Nielsen AZ Martens HJ Ruf S Kroop X Olsen CE 634
Motawie MS Pribil M Moller BL Bock R Jensen PE (2016) Transfer of the 635
cytochrome P450-dependent dhurrin pathway from Sorghum bicolor into Nicotiana 636
tabacum chloroplasts for light-driven synthesis J Exp Bot 67 2495-2506 637
Haniewicz P Abram M Nosek L Kirkpatrick J El-Mohsnawy E Olmos JDJ Kouřil 638
R Kargul JM (2018) Molecular mechanisms of photoadaptation of photosystem I 639
supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
harvesting chlorophyll ab-binding protein in Synechocystis sp PCC 6803 Eur J 643
Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
synthase is a highly divergent paralog of PsbA of photosystem II Science 353 646
Holt NE Fleming GR Niyogi KK (2004) Toward an understanding of the mechanism of 647
nonphotochemical quenching in green plants Biochemistry 43 8281-8289 648
Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
D Kamachi T Okura I (2006a) Light-driven hydrogen production by a hybrid 650
complex of a [NiFe]-hydrogenase and the cyanobacterial photosystem I Photochem 651
Photobiol 82 676-682 652
Ihara M Nakamoto H Kamachi T Okura I Maeda M (2006b) Photoinduced hydrogen 653
production by direct electron transfer from photosystem I cross-linked with 654
cytochrome c3 to [NiFe]-hydrogenase Photochem Photobiol 82 1677-1685Janna 655
Olmos JD Kargul J (2015) A quest for the artificial leaf Int J Biochem Cell Biol 656
66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
Pawlak D Kargul J (2017) Biofunctionalisation of p-doped silicon with cytochrome 659
c553 minimises charge recombination and enhances photovoltaic performance of the 660
all-solid-state photosystem I-based biophotoelectrode RSC Adv 7 47854-47866 661
Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations 662
ACS Chem Biol 6 533-539 663
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35
Jensen PE Leister D (2014) Chloroplast evolution structure and functions F1000Prime 664
Rep 6 40 665
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip 666
functionalization of carbon nanotubes with photosystem I J Am Chem Soc 132 667
2872-2873 668
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and 669
its application in biomimetic solar-to-fuel systems J Plant Physiol 169 1639-1653 670
Kargul J Bubak G Andryianau G (2018) Biophotovoltaic systems based on 671
photosynthetic complexes In Wandelt K (Ed) Encyclopedia of Interfacial 672
Chemistry Surface Science and Electrochemistry vol 7 pp 43-63 673
Kim YS Hara M Ikebukuro K Miyake J Ohkawa H Karube I (1996) Photo-induced 674
activation of cytochrome P450reductase fusion enzyme coupled with spinach 675
chloroplasts Biotechnol Tech 10 717minus720 676
Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic 677
hydrogen production by a hybrid complex of photosystem I and [NiFe]-hydrogenase 678
ACS Nano 3 4055-4061 679
Kromdijk J Glowacka K Leonelli L Gabilly ST Iwai M Niyogi KK Long SP (2016) 680
Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
Kubota H Sakurai I Katayama K Mizusawa N Ohashi S Kobayashi M Zhang P Aro 683
EM Wada H (2010) Purification and characterization of photosystem I complex 684
from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim 685
Biophys Acta 1797 98-105 686
Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future 702
by engineering crop photosynthesis and yield potential Cell 161 56-66 703
Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
(2011) Solar hydrogen-producing bionanodevice outperforms natural photosynthesis 709
Proc Natl Acad Sci U S A 108 20988-20991 710
Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
production Biochemistry 49 10264-10266 713
Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
organisms using whole-cell and cell-free systems Appl Biochem Biotechnol 183 715
503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
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Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
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biosynthesis ACS Chem Biol 11 1862-1869 721
Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous 722
enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
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37
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low-light stress J Exp Bot 56 389-393 734
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Nanosci Nanotechnol 9 1709-1713 736
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photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello 742
Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in 748
understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in 750
Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
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Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
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24340-24354 767
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins 768
Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
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Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
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Lett 581 2768-2775 776
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2189 785
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134-145 788
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Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
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photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
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Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
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40
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843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
18
challenges need to be overcome Two challenges for the in vivo systems are obvious (i) 421
enhancing the efficiency of in-vivo bio-bio hybrids and (ii) upscaling the size of ldquosynthetic 422
photosynthetic modulesrdquo to cover entire photosystems or complex antenna systems 423
With respect to the enhancement of in vivo cyanobacterial and algal systems 424
harboring hybrid configurations in which photosynthesis directly drives previously 425
unconnected pathways the use of laboratory evolution offers a unique opportunity to tailor 426
these systems for their intended purpose Laboratory evolution utilizes the high rate of 427
evolution typical in microbial systems (in particular if suitable selection conditions can be 428
designed) to fine tune and optimize processes through selection of advantageous genetic 429
variation While this strategy has been employed in E coli and yeast with impressive success 430
now photosynthetic microbial systems are emerging as attractive targets for this approach 431
(Leister 2017) 432
The exchange of entire multiprotein complexes between distantly related species will 433
not be a simple exercise because the ldquofrozen metabolic staterdquo of the core photosynthetic 434
complexes will necessitate the exchange of major parts of photosystems rather than 435
individual subunits The RuBisCO case study by Aigner et al (2017) represents of promising 436
proof of principle but one needs to consider that the synthetic RuBisCO module comprised 437
only the two different subunits present in the mature complex and five auxiliary factors for its 438
assembly Entire photosystems will require much larger ldquosynthetic photosynthetic modulesrdquo 439
and many of the auxiliary factors have not been identified yet Therefore when designing 440
these complex ldquosynthetic photosynthetic modulesrdquo we will identify the set of components 441
that are sufficient (and not only necessary) to drive photosynthesis providing an 442
unprecedentedly deep understanding of this fundamental and complex process 443
Given that the problems described above can be solved what will be the next steps in 444
the synthetic biology of the light reactions of photosynthesis The combination of ldquosynthetic 445
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19
photosynthetic modulesrdquo from diverse species could allow the design of novel variants of 446
photosynthesis Numerous instances of such ldquorecombined photosynthetic variantsrdquo can be 447
imagined including plants that employ cyanobacteria-derived phycobilisomes for highly 448
sufficient photosynthesis under low light conditions cyanobacteria that employ plant-derived 449
LHCs as antenna to shift light saturation of photosynthesis to higher intensities or the 450
integration of cyanobacterial Chl d and Chl f (which can absorb far-red and near infra-red 451
light) into algal or plant photosynthesis to expand the spectral region available to drive 452
photosynthesis (Loughlin et al 2013 Ho et al 2016) Moreover such variants of 453
recombined photosynthesis could be further optimized by laboratory evolution within a 454
suitable microbial chassis However such recombined photosynthetic variants cannot be 455
considered a truly novel type of photosynthesis because they would only bring preexisting 456
pieces together that evolution has separated Nevertheless they could be an important step 457
towards the ambitious goal to design truly novel ldquosynthetic photosynthetic modulesrdquo that 458
contain more efficient substitutes of the ldquofrozen metabolic accidentsrdquo discussed above 459
Ample proof of functionality for in-vivo hybrids (between photosynthesis and 460
previously unconnected metabolic pathways) and in-vitro hybrids (between PSI and biotic or 461
abiotic catalysts) has been obtained but such systems will only be commercially successful if 462
they can compete with established non-biological systems Tailoring of PSI in cyanobacteria 463
where techniques like gene replacement and gene modification are routine may contribute to 464
further improving the efficiency and robustness of in vitro and in vivo hybrids One 465
promising route could be to identify those parts of the original PSI (which evolved under 466
constraints imposed by the cyanobacterial cell) that are necessary for hybrid devices (a 467
ldquominimalrdquo PSI) Such bio-nano systems can be optimized to include novel non-biological 468
components that replace or complement natural pigments andor the protein-based backbone 469
of photosystems going far beyond the limited toolbox of Naturersquos chemistry Such novel 470
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20
systems inspired by natural photosynthesis could be used to engage biologists in the design 471
of fundamentally different types of photosynthesis in living organisms 472
473
SUPPLEMENTAL DATA 474
Supplemental Table 1 Absencepresence of photosynthetic proteins in the three model 475
species Synechocystis PCC6803 (Syn) Chlamydomonas reinhardtii (Cr) and Arabidopsis 476
thaliana (At) 477
478
ACKNOWLEDGMENTS 479
The authors thank Paul Hardy for critical reading of the manuscript 480
481
482
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21
Table 1 Replacement of conserved individual or multiple photosynthetic proteins 483
GeneProtein Description Protein
identity
Reference
psbAD1 Synechocystis D1 was replaced by its homolog from
Poa annua which resulted in slower growth This is
likely to be due to increased charge recombination
between the donor and acceptor sides of the reaction
center
86 Nixon et al
1991
psbBCP47 Synechocystis CP47 was replaced by its homolog
from spinach and photoautotrophy was lost
80 Vermaas et
al 1996
psbCCP43 Synechocystis CP43 was replaced by its homolog
from spinach and photoautotrophy was lost
85 Carpenter et
al 1993
psbHPsbH Synechocystis PsbH was replaced by its counterpart
from maize The resulting strain displayed increased
light sensitivity and lower chlorophyll content
78 Chiaramonte
et al 1999
psaAPsaA Synechocystis PsaA was replaced by its equivalent
from A thaliana This resulted in reduced photo-
autotrophical growth and a drastically reduced
ChlPC ratio
80 Viola et al
2014
psbABCDEF
D1CP47CP43D2
Cyt b559-+
All six core subunits of C reinhardtii were replaced
by their counterparts from two different green algae
(V carteri and S obliquus) The resulting strains
were photoautotrophic but showed reduced
photosynthetic efficiency and the heterologous
82 -
99
Gimpel et al
2016
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22
proteins reached only between 10 and 20 of the
levels of those they replaced
484
485
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
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24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
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26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
32
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566
Aigner H Wilson RH Bracher A Calisse L Bhat JY Hartl FU Hayer-Hartl M (2017) 567
Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
chloroplast-ferredoxin-hydrogenase system Proc Natl Acad Sci U S A 70 2317-2320 571
Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
complements ferredoxin deficiency in knocked-down transgenic tobacco plants Plant 574
J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
photosynthesis for energy production Curr Opin Chem Biol 17 457-461 577
Burgdorf T Lenz O Buhrke T van der Linden E Jones AK Albracht SP Friedrich B 578
(2005) [NiFe]-hydrogenases of Ralstonia eutropha H16 modular enzymes for 579
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96 581
Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
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nanoparticle antennas Nano Lett 10 2069-2074 584
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CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
the water-splitting system of Photosystem II Biochim Biophys Acta 1144 204-212 587
Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
Eur J Biochem 260 833-843 593
Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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33
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Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
by thermal dissipation of excess energy Biochem Soc Trans 38 651-660 608
Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
device by direct chemical binding of the photosynthetic reaction center protein to 610
metal surfaces Advanced Materials 17 2434-2437 611
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13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
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Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
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Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
state biophotovoltaic cells containing photosystem I Adv Mater 26 4863-4869 630
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supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
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Biochem 263 561-570 644
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66 37-44 657
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ACS Chem Biol 6 533-539 663
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35
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Plant Sci 3 199 694
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hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
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wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
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Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
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U S A 104 11495-11500 809
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green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled 812
photodamage resistance New Phytol 210 1229-1243 813
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Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
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Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M 827
Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
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Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in 831
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14168-14173 833
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) 834
Photosynthetic electron partitioning between [FeFe]-hydrogenase and 835
ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S 836
A 108 9396-9401 837
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of 838
alternative electron flow by flavodiiron proteins in Arabidopsis Nat Plants 2 16012 839
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ 840
(2018) Ectopic expression of SsPETE2 a plastocyanin from Suaeda salsa improves 841
plant tolerance to oxidative stress Plant Sci 268 1-10 842
843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N (2006) Functional replacement of ferredoxin by acyanobacterial flavodoxin in tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR Carrillo N (2007) Enhanced plant tolerance to ironstarvation by functional substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci U S A 104 11495-11500
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M Norici A Shotland Y Ohad I Kaplan A (2016) Themechanisms whereby the green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled photodamage resistanceNew Phytol 210 1229-1243
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from Photosystem I-catalyst hybrids Curr Opin Chem Biol25 1-8
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium Synechocystis sp PCC 6803 carrying spinachsequences Construction and function Photosynth Res 48 147-162
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene replacement in Synechocystis sp PCC 6803Microb Cell Fact 13 4
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron Protein Substitutes for Cyclic Electron Flow withoutCompeting CO2 Assimilation in Rice Plant Physiol 176 1509-1518
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) Plastocyanin is indispensable for photosyntheticelectron flow in Arabidopsis thaliana J Biol Chem 278 31286-31289
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M Thofner JF Olsen CE Mottawie MS Burow M Pribil MFeussner I Moller BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 dependent pathways intoSynechocystis sp PCC 6803 Metab Eng 33 1-11
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Google Scholar Author Only Title Only Author and Title
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in functional photosystem II complexes ofcyanobacteria Proc Natl Acad Sci U S A 98 14168-14173
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) Photosynthetic electron partitioning between [FeFe]-hydrogenase and ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S A 108 9396-9401
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of alternative electron flow by flavodiiron proteins inArabidopsis Nat Plants 2 16012
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ (2018) Ectopic expression of SsPETE2 a plastocyanin fromSuaeda salsa improves plant tolerance to oxidative stress Plant Sci 268 1-10
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wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
19
photosynthetic modulesrdquo from diverse species could allow the design of novel variants of 446
photosynthesis Numerous instances of such ldquorecombined photosynthetic variantsrdquo can be 447
imagined including plants that employ cyanobacteria-derived phycobilisomes for highly 448
sufficient photosynthesis under low light conditions cyanobacteria that employ plant-derived 449
LHCs as antenna to shift light saturation of photosynthesis to higher intensities or the 450
integration of cyanobacterial Chl d and Chl f (which can absorb far-red and near infra-red 451
light) into algal or plant photosynthesis to expand the spectral region available to drive 452
photosynthesis (Loughlin et al 2013 Ho et al 2016) Moreover such variants of 453
recombined photosynthesis could be further optimized by laboratory evolution within a 454
suitable microbial chassis However such recombined photosynthetic variants cannot be 455
considered a truly novel type of photosynthesis because they would only bring preexisting 456
pieces together that evolution has separated Nevertheless they could be an important step 457
towards the ambitious goal to design truly novel ldquosynthetic photosynthetic modulesrdquo that 458
contain more efficient substitutes of the ldquofrozen metabolic accidentsrdquo discussed above 459
Ample proof of functionality for in-vivo hybrids (between photosynthesis and 460
previously unconnected metabolic pathways) and in-vitro hybrids (between PSI and biotic or 461
abiotic catalysts) has been obtained but such systems will only be commercially successful if 462
they can compete with established non-biological systems Tailoring of PSI in cyanobacteria 463
where techniques like gene replacement and gene modification are routine may contribute to 464
further improving the efficiency and robustness of in vitro and in vivo hybrids One 465
promising route could be to identify those parts of the original PSI (which evolved under 466
constraints imposed by the cyanobacterial cell) that are necessary for hybrid devices (a 467
ldquominimalrdquo PSI) Such bio-nano systems can be optimized to include novel non-biological 468
components that replace or complement natural pigments andor the protein-based backbone 469
of photosystems going far beyond the limited toolbox of Naturersquos chemistry Such novel 470
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
20
systems inspired by natural photosynthesis could be used to engage biologists in the design 471
of fundamentally different types of photosynthesis in living organisms 472
473
SUPPLEMENTAL DATA 474
Supplemental Table 1 Absencepresence of photosynthetic proteins in the three model 475
species Synechocystis PCC6803 (Syn) Chlamydomonas reinhardtii (Cr) and Arabidopsis 476
thaliana (At) 477
478
ACKNOWLEDGMENTS 479
The authors thank Paul Hardy for critical reading of the manuscript 480
481
482
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
21
Table 1 Replacement of conserved individual or multiple photosynthetic proteins 483
GeneProtein Description Protein
identity
Reference
psbAD1 Synechocystis D1 was replaced by its homolog from
Poa annua which resulted in slower growth This is
likely to be due to increased charge recombination
between the donor and acceptor sides of the reaction
center
86 Nixon et al
1991
psbBCP47 Synechocystis CP47 was replaced by its homolog
from spinach and photoautotrophy was lost
80 Vermaas et
al 1996
psbCCP43 Synechocystis CP43 was replaced by its homolog
from spinach and photoautotrophy was lost
85 Carpenter et
al 1993
psbHPsbH Synechocystis PsbH was replaced by its counterpart
from maize The resulting strain displayed increased
light sensitivity and lower chlorophyll content
78 Chiaramonte
et al 1999
psaAPsaA Synechocystis PsaA was replaced by its equivalent
from A thaliana This resulted in reduced photo-
autotrophical growth and a drastically reduced
ChlPC ratio
80 Viola et al
2014
psbABCDEF
D1CP47CP43D2
Cyt b559-+
All six core subunits of C reinhardtii were replaced
by their counterparts from two different green algae
(V carteri and S obliquus) The resulting strains
were photoautotrophic but showed reduced
photosynthetic efficiency and the heterologous
82 -
99
Gimpel et al
2016
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
22
proteins reached only between 10 and 20 of the
levels of those they replaced
484
485
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
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24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
32
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566
Aigner H Wilson RH Bracher A Calisse L Bhat JY Hartl FU Hayer-Hartl M (2017) 567
Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
chloroplast-ferredoxin-hydrogenase system Proc Natl Acad Sci U S A 70 2317-2320 571
Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
complements ferredoxin deficiency in knocked-down transgenic tobacco plants Plant 574
J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
photosynthesis for energy production Curr Opin Chem Biol 17 457-461 577
Burgdorf T Lenz O Buhrke T van der Linden E Jones AK Albracht SP Friedrich B 578
(2005) [NiFe]-hydrogenases of Ralstonia eutropha H16 modular enzymes for 579
oxygen-tolerant biological hydrogen oxidation J Mol Microbiol Biotechnol 10 181-580
96 581
Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
(2010) Broad band enhancement of light absorption in photosystem I by metal 583
nanoparticle antennas Nano Lett 10 2069-2074 584
Carpenter SD Ohad I Vermaas WF (1993) Analysis of chimeric spinachcyanobacterial 585
CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
the water-splitting system of Photosystem II Biochim Biophys Acta 1144 204-212 587
Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
Eur J Biochem 260 833-843 593
Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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33
Ciornii D Riedel M Stieger KR Feifel SC Hejazi M Lokstein H Zouni A Lisdat F 598
(2017) Bioelectronic Circuit on a 3D Electrode Architecture Enzymatic Catalysis 599
Interconnected with Photosystem I J Am Chem Soc 139 16478-16481 600
Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel 601
genetic diversity Philos Trans R Soc Lond B Biol Sci 372 602
Das R Kiley PJ Segal M Norville J Yu AA Wang L Trammell SA Reddick LE 603
Kumar R Stellacci F Lebedev N Schnur J Bruce BD Zhang S Baldo M (2004) 604
Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
by thermal dissipation of excess energy Biochem Soc Trans 38 651-660 608
Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
device by direct chemical binding of the photosynthetic reaction center protein to 610
metal surfaces Advanced Materials 17 2434-2437 611
Frolov L Rosenwaks Y Richter S Carmeli C Carmeli I (2008) Photoelectric junctions 612
between GaAs and photosynthetic reaction center protein J Phys Chem C 112 613
13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I 617
Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
reinhardtii ACS Synth Biol 5 589-596 624
Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
state biophotovoltaic cells containing photosystem I Adv Mater 26 4863-4869 630
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34
Glowacka K Kromdijk J Kucera K Xie J Cavanagh AP Leonelli L Leakey ADB Ort 631
DR Niyogi KK Long SP (2018) Photosystem II subunit S overexpression increases 632
the efficiency of water use in a field-grown crop Nat Commun 9 868 633
Gnanasekaran T Karcher D Nielsen AZ Martens HJ Ruf S Kroop X Olsen CE 634
Motawie MS Pribil M Moller BL Bock R Jensen PE (2016) Transfer of the 635
cytochrome P450-dependent dhurrin pathway from Sorghum bicolor into Nicotiana 636
tabacum chloroplasts for light-driven synthesis J Exp Bot 67 2495-2506 637
Haniewicz P Abram M Nosek L Kirkpatrick J El-Mohsnawy E Olmos JDJ Kouřil 638
R Kargul JM (2018) Molecular mechanisms of photoadaptation of photosystem I 639
supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
harvesting chlorophyll ab-binding protein in Synechocystis sp PCC 6803 Eur J 643
Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
synthase is a highly divergent paralog of PsbA of photosystem II Science 353 646
Holt NE Fleming GR Niyogi KK (2004) Toward an understanding of the mechanism of 647
nonphotochemical quenching in green plants Biochemistry 43 8281-8289 648
Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
D Kamachi T Okura I (2006a) Light-driven hydrogen production by a hybrid 650
complex of a [NiFe]-hydrogenase and the cyanobacterial photosystem I Photochem 651
Photobiol 82 676-682 652
Ihara M Nakamoto H Kamachi T Okura I Maeda M (2006b) Photoinduced hydrogen 653
production by direct electron transfer from photosystem I cross-linked with 654
cytochrome c3 to [NiFe]-hydrogenase Photochem Photobiol 82 1677-1685Janna 655
Olmos JD Kargul J (2015) A quest for the artificial leaf Int J Biochem Cell Biol 656
66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
Pawlak D Kargul J (2017) Biofunctionalisation of p-doped silicon with cytochrome 659
c553 minimises charge recombination and enhances photovoltaic performance of the 660
all-solid-state photosystem I-based biophotoelectrode RSC Adv 7 47854-47866 661
Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations 662
ACS Chem Biol 6 533-539 663
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35
Jensen PE Leister D (2014) Chloroplast evolution structure and functions F1000Prime 664
Rep 6 40 665
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip 666
functionalization of carbon nanotubes with photosystem I J Am Chem Soc 132 667
2872-2873 668
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and 669
its application in biomimetic solar-to-fuel systems J Plant Physiol 169 1639-1653 670
Kargul J Bubak G Andryianau G (2018) Biophotovoltaic systems based on 671
photosynthetic complexes In Wandelt K (Ed) Encyclopedia of Interfacial 672
Chemistry Surface Science and Electrochemistry vol 7 pp 43-63 673
Kim YS Hara M Ikebukuro K Miyake J Ohkawa H Karube I (1996) Photo-induced 674
activation of cytochrome P450reductase fusion enzyme coupled with spinach 675
chloroplasts Biotechnol Tech 10 717minus720 676
Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic 677
hydrogen production by a hybrid complex of photosystem I and [NiFe]-hydrogenase 678
ACS Nano 3 4055-4061 679
Kromdijk J Glowacka K Leonelli L Gabilly ST Iwai M Niyogi KK Long SP (2016) 680
Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
Kubota H Sakurai I Katayama K Mizusawa N Ohashi S Kobayashi M Zhang P Aro 683
EM Wada H (2010) Purification and characterization of photosystem I complex 684
from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim 685
Biophys Acta 1797 98-105 686
Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future 702
by engineering crop photosynthesis and yield potential Cell 161 56-66 703
Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
(2011) Solar hydrogen-producing bionanodevice outperforms natural photosynthesis 709
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Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
production Biochemistry 49 10264-10266 713
Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
organisms using whole-cell and cell-free systems Appl Biochem Biotechnol 183 715
503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
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Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
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biosynthesis ACS Chem Biol 11 1862-1869 721
Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous 722
enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
Y Nishihara H (2010) A photosensing system composed of photosystem I 725
molecular wire gold nanoparticle and double surfactants in water Chem Commun 726
(Camb) 46 2557-2559 727
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
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37
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Mullineaux CW Emlyn-Jones D (2005) State transitions an example of acclimation to 733
low-light stress J Exp Bot 56 389-393 734
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J 735
Nanosci Nanotechnol 9 1709-1713 736
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photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello 742
Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in 748
understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in 750
Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
complex Plant Cell 3 383-395 752
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
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38
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24340-24354 767
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins 768
Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
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Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
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Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS 775
Lett 581 2768-2775 776
Schiffels J Pinkenburg O Schelden M Aboulnaga el-HA Baumann ME Selmer T 777
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3619-3639 782
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2189 785
Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS 786
Protein Increases Electron Transport Rates and Biomass Yield Plant Physiol 175 787
134-145 788
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Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
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tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050 805
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
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photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
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Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium 816
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Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
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Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
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40
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843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
20
systems inspired by natural photosynthesis could be used to engage biologists in the design 471
of fundamentally different types of photosynthesis in living organisms 472
473
SUPPLEMENTAL DATA 474
Supplemental Table 1 Absencepresence of photosynthetic proteins in the three model 475
species Synechocystis PCC6803 (Syn) Chlamydomonas reinhardtii (Cr) and Arabidopsis 476
thaliana (At) 477
478
ACKNOWLEDGMENTS 479
The authors thank Paul Hardy for critical reading of the manuscript 480
481
482
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21
Table 1 Replacement of conserved individual or multiple photosynthetic proteins 483
GeneProtein Description Protein
identity
Reference
psbAD1 Synechocystis D1 was replaced by its homolog from
Poa annua which resulted in slower growth This is
likely to be due to increased charge recombination
between the donor and acceptor sides of the reaction
center
86 Nixon et al
1991
psbBCP47 Synechocystis CP47 was replaced by its homolog
from spinach and photoautotrophy was lost
80 Vermaas et
al 1996
psbCCP43 Synechocystis CP43 was replaced by its homolog
from spinach and photoautotrophy was lost
85 Carpenter et
al 1993
psbHPsbH Synechocystis PsbH was replaced by its counterpart
from maize The resulting strain displayed increased
light sensitivity and lower chlorophyll content
78 Chiaramonte
et al 1999
psaAPsaA Synechocystis PsaA was replaced by its equivalent
from A thaliana This resulted in reduced photo-
autotrophical growth and a drastically reduced
ChlPC ratio
80 Viola et al
2014
psbABCDEF
D1CP47CP43D2
Cyt b559-+
All six core subunits of C reinhardtii were replaced
by their counterparts from two different green algae
(V carteri and S obliquus) The resulting strains
were photoautotrophic but showed reduced
photosynthetic efficiency and the heterologous
82 -
99
Gimpel et al
2016
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22
proteins reached only between 10 and 20 of the
levels of those they replaced
484
485
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
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24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
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25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
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26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
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31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
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32
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66 37-44 657
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ACS Chem Biol 6 533-539 663
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Chemistry Surface Science and Electrochemistry vol 7 pp 43-63 673
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chloroplasts Biotechnol Tech 10 717minus720 676
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ACS Nano 3 4055-4061 679
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Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
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Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
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Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future 702
by engineering crop photosynthesis and yield potential Cell 161 56-66 703
Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
(2011) Solar hydrogen-producing bionanodevice outperforms natural photosynthesis 709
Proc Natl Acad Sci U S A 108 20988-20991 710
Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
production Biochemistry 49 10264-10266 713
Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
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503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
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Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
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biosynthesis ACS Chem Biol 11 1862-1869 721
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enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
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molecular wire gold nanoparticle and double surfactants in water Chem Commun 726
(Camb) 46 2557-2559 727
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
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fabrication of a bio-photoelectrode J Nanosci Nanotechnol 9 1722-1726 730
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37
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1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
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Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
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236-248 762
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38
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2189 785
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39
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Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
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Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
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40
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843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
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21
Table 1 Replacement of conserved individual or multiple photosynthetic proteins 483
GeneProtein Description Protein
identity
Reference
psbAD1 Synechocystis D1 was replaced by its homolog from
Poa annua which resulted in slower growth This is
likely to be due to increased charge recombination
between the donor and acceptor sides of the reaction
center
86 Nixon et al
1991
psbBCP47 Synechocystis CP47 was replaced by its homolog
from spinach and photoautotrophy was lost
80 Vermaas et
al 1996
psbCCP43 Synechocystis CP43 was replaced by its homolog
from spinach and photoautotrophy was lost
85 Carpenter et
al 1993
psbHPsbH Synechocystis PsbH was replaced by its counterpart
from maize The resulting strain displayed increased
light sensitivity and lower chlorophyll content
78 Chiaramonte
et al 1999
psaAPsaA Synechocystis PsaA was replaced by its equivalent
from A thaliana This resulted in reduced photo-
autotrophical growth and a drastically reduced
ChlPC ratio
80 Viola et al
2014
psbABCDEF
D1CP47CP43D2
Cyt b559-+
All six core subunits of C reinhardtii were replaced
by their counterparts from two different green algae
(V carteri and S obliquus) The resulting strains
were photoautotrophic but showed reduced
photosynthetic efficiency and the heterologous
82 -
99
Gimpel et al
2016
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22
proteins reached only between 10 and 20 of the
levels of those they replaced
484
485
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23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
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24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
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26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
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28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
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32
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566
Aigner H Wilson RH Bracher A Calisse L Bhat JY Hartl FU Hayer-Hartl M (2017) 567
Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
chloroplast-ferredoxin-hydrogenase system Proc Natl Acad Sci U S A 70 2317-2320 571
Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
complements ferredoxin deficiency in knocked-down transgenic tobacco plants Plant 574
J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
photosynthesis for energy production Curr Opin Chem Biol 17 457-461 577
Burgdorf T Lenz O Buhrke T van der Linden E Jones AK Albracht SP Friedrich B 578
(2005) [NiFe]-hydrogenases of Ralstonia eutropha H16 modular enzymes for 579
oxygen-tolerant biological hydrogen oxidation J Mol Microbiol Biotechnol 10 181-580
96 581
Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
(2010) Broad band enhancement of light absorption in photosystem I by metal 583
nanoparticle antennas Nano Lett 10 2069-2074 584
Carpenter SD Ohad I Vermaas WF (1993) Analysis of chimeric spinachcyanobacterial 585
CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
the water-splitting system of Photosystem II Biochim Biophys Acta 1144 204-212 587
Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
Eur J Biochem 260 833-843 593
Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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33
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(2017) Bioelectronic Circuit on a 3D Electrode Architecture Enzymatic Catalysis 599
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Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel 601
genetic diversity Philos Trans R Soc Lond B Biol Sci 372 602
Das R Kiley PJ Segal M Norville J Yu AA Wang L Trammell SA Reddick LE 603
Kumar R Stellacci F Lebedev N Schnur J Bruce BD Zhang S Baldo M (2004) 604
Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
by thermal dissipation of excess energy Biochem Soc Trans 38 651-660 608
Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
device by direct chemical binding of the photosynthetic reaction center protein to 610
metal surfaces Advanced Materials 17 2434-2437 611
Frolov L Rosenwaks Y Richter S Carmeli C Carmeli I (2008) Photoelectric junctions 612
between GaAs and photosynthetic reaction center protein J Phys Chem C 112 613
13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I 617
Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
reinhardtii ACS Synth Biol 5 589-596 624
Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
state biophotovoltaic cells containing photosystem I Adv Mater 26 4863-4869 630
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DR Niyogi KK Long SP (2018) Photosystem II subunit S overexpression increases 632
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Gnanasekaran T Karcher D Nielsen AZ Martens HJ Ruf S Kroop X Olsen CE 634
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Haniewicz P Abram M Nosek L Kirkpatrick J El-Mohsnawy E Olmos JDJ Kouřil 638
R Kargul JM (2018) Molecular mechanisms of photoadaptation of photosystem I 639
supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
harvesting chlorophyll ab-binding protein in Synechocystis sp PCC 6803 Eur J 643
Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
synthase is a highly divergent paralog of PsbA of photosystem II Science 353 646
Holt NE Fleming GR Niyogi KK (2004) Toward an understanding of the mechanism of 647
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Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
D Kamachi T Okura I (2006a) Light-driven hydrogen production by a hybrid 650
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Photobiol 82 676-682 652
Ihara M Nakamoto H Kamachi T Okura I Maeda M (2006b) Photoinduced hydrogen 653
production by direct electron transfer from photosystem I cross-linked with 654
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Olmos JD Kargul J (2015) A quest for the artificial leaf Int J Biochem Cell Biol 656
66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
Pawlak D Kargul J (2017) Biofunctionalisation of p-doped silicon with cytochrome 659
c553 minimises charge recombination and enhances photovoltaic performance of the 660
all-solid-state photosystem I-based biophotoelectrode RSC Adv 7 47854-47866 661
Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations 662
ACS Chem Biol 6 533-539 663
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35
Jensen PE Leister D (2014) Chloroplast evolution structure and functions F1000Prime 664
Rep 6 40 665
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip 666
functionalization of carbon nanotubes with photosystem I J Am Chem Soc 132 667
2872-2873 668
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and 669
its application in biomimetic solar-to-fuel systems J Plant Physiol 169 1639-1653 670
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Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic 677
hydrogen production by a hybrid complex of photosystem I and [NiFe]-hydrogenase 678
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Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
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from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim 685
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Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future 702
by engineering crop photosynthesis and yield potential Cell 161 56-66 703
Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
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Proc Natl Acad Sci U S A 108 20988-20991 710
Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
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production Biochemistry 49 10264-10266 713
Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
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503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
hydrogenases J Biochem 123 644-649 718
Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
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Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous 722
enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
Y Nishihara H (2010) A photosensing system composed of photosystem I 725
molecular wire gold nanoparticle and double surfactants in water Chem Commun 726
(Camb) 46 2557-2559 727
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
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fabrication of a bio-photoelectrode J Nanosci Nanotechnol 9 1722-1726 730
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Molina-Heredia FP Wastl J Navarro JA Bendall DS Hervas M Howe CJ De La Rosa 731
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low-light stress J Exp Bot 56 389-393 734
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J 735
Nanosci Nanotechnol 9 1709-1713 736
Nguyen K Bruce BD (2014) Growing green electricity progress and strategies for use of 737
photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello 742
Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
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understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in 750
Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
complex Plant Cell 3 383-395 752
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
S Cazzaniga S Bassi R (2015) Heterologous expression of moss light-harvesting 764
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38
complex stress-related 1 (LHCSR1) the chlorophyll a-xanthophyll pigment-protein 765
complex catalyzing non-photochemical quenching in Nicotiana sp J Biol Chem 290 766
24340-24354 767
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins 768
Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
phosphatase TAP38 in LHCII dephosphorylation and thylakoid electron flow PLoS 771
Biol 8 e1000288 772
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
natural product biosynthesis Protoplasma 253 1197-1209 774
Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS 775
Lett 581 2768-2775 776
Schiffels J Pinkenburg O Schelden M Aboulnaga el-HA Baumann ME Selmer T 777
(2013) An innovative cloning platform enables large-scale production and maturation 778
of an oxygen-tolerant [NiFe]-hydrogenase from Cupriavidus necator in Escherichia 779
coli PLoS One 8 e6881 780
Schmid VH (2008) Light-harvesting complexes of vascular plants Cell Mol Life Sci 65 781
3619-3639 782
Shi T Bibby TS Jiang L Irwin AJ Falkowski PG (2005) Protein interactions limit the 783
rate of evolution of photosynthetic genes in cyanobacteria Mol Biol Evol 22 2179-784
2189 785
Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS 786
Protein Increases Electron Transport Rates and Biomass Yield Plant Physiol 175 787
134-145 788
Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J 789
(2017) Plasmon-induced absorption of blind chlorophylls in photosynthetic proteins 790
assembled on silver nanowires Nanoscale 9 10475-10486 791
792
Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
Sakai M Fujii M Tohri A Iwai M Inoue Y Yoneyama S Minakata M Enami I 794
(2009) Plugging a molecular wire into photosystem I reconstitution of the 795
photoelectric conversion system on a gold electrode Angew Chem Int Ed Engl 48 796
1585-1587 797
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Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M 798
Iwai M Taguchi S Enami I Inoue Y Yamanoi Y Yonezawa T Mizuno K 799
Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M 800
(2007) Bio-photosensor Cyanobacterial photosystem I coupled with transistor via 801
molecular wire Biochim Biophys Acta 1767 653-659 802
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N 803
(2006) Functional replacement of ferredoxin by a cyanobacterial flavodoxin in 804
tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050 805
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
U S A 104 11495-11500 809
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M 810
Norici A Shotland Y Ohad I Kaplan A (2016) The mechanisms whereby the 811
green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled 812
photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
Photosystem I-catalyst hybrids Curr Opin Chem Biol 25 1-8 815
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium 816
Synechocystis sp PCC 6803 carrying spinach sequences Construction and function 817
Photosynth Res 48 147-162 818
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene 819
replacement in Synechocystis sp PCC 6803 Microb Cell Fact 13 4 820
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
thaliana J Biol Chem 278 31286-31289 826
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M 827
Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
dependent pathways into Synechocystis sp PCC 6803 Metab Eng 33 1-11 830
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40
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functional photosystem II complexes of cyanobacteria Proc Natl Acad Sci U S A 98 832
14168-14173 833
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) 834
Photosynthetic electron partitioning between [FeFe]-hydrogenase and 835
ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S 836
A 108 9396-9401 837
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of 838
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(2018) Ectopic expression of SsPETE2 a plastocyanin from Suaeda salsa improves 841
plant tolerance to oxidative stress Plant Sci 268 1-10 842
843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
22
proteins reached only between 10 and 20 of the
levels of those they replaced
484
485
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23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
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26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
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32
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566
Aigner H Wilson RH Bracher A Calisse L Bhat JY Hartl FU Hayer-Hartl M (2017) 567
Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
chloroplast-ferredoxin-hydrogenase system Proc Natl Acad Sci U S A 70 2317-2320 571
Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
complements ferredoxin deficiency in knocked-down transgenic tobacco plants Plant 574
J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
photosynthesis for energy production Curr Opin Chem Biol 17 457-461 577
Burgdorf T Lenz O Buhrke T van der Linden E Jones AK Albracht SP Friedrich B 578
(2005) [NiFe]-hydrogenases of Ralstonia eutropha H16 modular enzymes for 579
oxygen-tolerant biological hydrogen oxidation J Mol Microbiol Biotechnol 10 181-580
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Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
(2010) Broad band enhancement of light absorption in photosystem I by metal 583
nanoparticle antennas Nano Lett 10 2069-2074 584
Carpenter SD Ohad I Vermaas WF (1993) Analysis of chimeric spinachcyanobacterial 585
CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
the water-splitting system of Photosystem II Biochim Biophys Acta 1144 204-212 587
Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
Eur J Biochem 260 833-843 593
Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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33
Ciornii D Riedel M Stieger KR Feifel SC Hejazi M Lokstein H Zouni A Lisdat F 598
(2017) Bioelectronic Circuit on a 3D Electrode Architecture Enzymatic Catalysis 599
Interconnected with Photosystem I J Am Chem Soc 139 16478-16481 600
Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel 601
genetic diversity Philos Trans R Soc Lond B Biol Sci 372 602
Das R Kiley PJ Segal M Norville J Yu AA Wang L Trammell SA Reddick LE 603
Kumar R Stellacci F Lebedev N Schnur J Bruce BD Zhang S Baldo M (2004) 604
Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
by thermal dissipation of excess energy Biochem Soc Trans 38 651-660 608
Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
device by direct chemical binding of the photosynthetic reaction center protein to 610
metal surfaces Advanced Materials 17 2434-2437 611
Frolov L Rosenwaks Y Richter S Carmeli C Carmeli I (2008) Photoelectric junctions 612
between GaAs and photosynthetic reaction center protein J Phys Chem C 112 613
13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I 617
Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
reinhardtii ACS Synth Biol 5 589-596 624
Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
state biophotovoltaic cells containing photosystem I Adv Mater 26 4863-4869 630
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34
Glowacka K Kromdijk J Kucera K Xie J Cavanagh AP Leonelli L Leakey ADB Ort 631
DR Niyogi KK Long SP (2018) Photosystem II subunit S overexpression increases 632
the efficiency of water use in a field-grown crop Nat Commun 9 868 633
Gnanasekaran T Karcher D Nielsen AZ Martens HJ Ruf S Kroop X Olsen CE 634
Motawie MS Pribil M Moller BL Bock R Jensen PE (2016) Transfer of the 635
cytochrome P450-dependent dhurrin pathway from Sorghum bicolor into Nicotiana 636
tabacum chloroplasts for light-driven synthesis J Exp Bot 67 2495-2506 637
Haniewicz P Abram M Nosek L Kirkpatrick J El-Mohsnawy E Olmos JDJ Kouřil 638
R Kargul JM (2018) Molecular mechanisms of photoadaptation of photosystem I 639
supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
harvesting chlorophyll ab-binding protein in Synechocystis sp PCC 6803 Eur J 643
Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
synthase is a highly divergent paralog of PsbA of photosystem II Science 353 646
Holt NE Fleming GR Niyogi KK (2004) Toward an understanding of the mechanism of 647
nonphotochemical quenching in green plants Biochemistry 43 8281-8289 648
Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
D Kamachi T Okura I (2006a) Light-driven hydrogen production by a hybrid 650
complex of a [NiFe]-hydrogenase and the cyanobacterial photosystem I Photochem 651
Photobiol 82 676-682 652
Ihara M Nakamoto H Kamachi T Okura I Maeda M (2006b) Photoinduced hydrogen 653
production by direct electron transfer from photosystem I cross-linked with 654
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Olmos JD Kargul J (2015) A quest for the artificial leaf Int J Biochem Cell Biol 656
66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
Pawlak D Kargul J (2017) Biofunctionalisation of p-doped silicon with cytochrome 659
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all-solid-state photosystem I-based biophotoelectrode RSC Adv 7 47854-47866 661
Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations 662
ACS Chem Biol 6 533-539 663
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35
Jensen PE Leister D (2014) Chloroplast evolution structure and functions F1000Prime 664
Rep 6 40 665
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip 666
functionalization of carbon nanotubes with photosystem I J Am Chem Soc 132 667
2872-2873 668
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and 669
its application in biomimetic solar-to-fuel systems J Plant Physiol 169 1639-1653 670
Kargul J Bubak G Andryianau G (2018) Biophotovoltaic systems based on 671
photosynthetic complexes In Wandelt K (Ed) Encyclopedia of Interfacial 672
Chemistry Surface Science and Electrochemistry vol 7 pp 43-63 673
Kim YS Hara M Ikebukuro K Miyake J Ohkawa H Karube I (1996) Photo-induced 674
activation of cytochrome P450reductase fusion enzyme coupled with spinach 675
chloroplasts Biotechnol Tech 10 717minus720 676
Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic 677
hydrogen production by a hybrid complex of photosystem I and [NiFe]-hydrogenase 678
ACS Nano 3 4055-4061 679
Kromdijk J Glowacka K Leonelli L Gabilly ST Iwai M Niyogi KK Long SP (2016) 680
Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
Kubota H Sakurai I Katayama K Mizusawa N Ohashi S Kobayashi M Zhang P Aro 683
EM Wada H (2010) Purification and characterization of photosystem I complex 684
from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim 685
Biophys Acta 1797 98-105 686
Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future 702
by engineering crop photosynthesis and yield potential Cell 161 56-66 703
Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
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Proc Natl Acad Sci U S A 108 20988-20991 710
Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
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Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
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503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
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Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
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biosynthesis ACS Chem Biol 11 1862-1869 721
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enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
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37
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low-light stress J Exp Bot 56 389-393 734
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J 735
Nanosci Nanotechnol 9 1709-1713 736
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1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
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Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in 748
understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in 750
Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
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Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
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24340-24354 767
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Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
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Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
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Lett 581 2768-2775 776
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2189 785
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134-145 788
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Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
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photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
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Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
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Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
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40
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843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
23
Table 2 Introduction of heterologous photosynthetic proteins (protein complexes) 486
GeneProtein Description Reference
PetJCytochrome c6 Growth and photosynthesis of Arabidopsis
thaliana plants was enhanced by the
expression of a red algal (Porphyra yezoensis)
cytochrome c6 gene
Chida et al
2007
flavodoxinflavodoxin Tobacco lines expressing a plastid-targeted
cyanobacterial flavodoxin in addition to
endogenous ferredoxin display increased
tolerance to environmental stress Flavodoxin
can at least partially replace ferredoxin in
tobacco
Tognetti et
al 2006
Tognetti et
al 2007
Blanco et al
2011
FlvA+BFlavodiiron
protein (FLV)
FlvA and FlvB from the moss Physcomitrella
patens mediate pseudocyclic electron flow in
A thaliana
Yamamoto et
al 2016
LhcbLHCII Pea Lhcb protein is synthesized in
Synechocystis and integrated into the
membrane but is then degraded such that it
cannot be detected by immunoblot analysis
He et al
1999
487
488
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
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31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
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32
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Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
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Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
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Plant Sci 3 199 694
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enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
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Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
(2011) Solar hydrogen-producing bionanodevice outperforms natural photosynthesis 709
Proc Natl Acad Sci U S A 108 20988-20991 710
Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
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503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
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Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
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enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
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(Camb) 46 2557-2559 727
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
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37
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Rev Plant Biol 64 609-635 741
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Redirecting photosynthetic reducing power toward bioactive natural product 746
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236-248 762
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38
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Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
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40
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843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
24
Table 3 Combination of PSI with non-photosynthetic proteins or complexes bio-bio 489
hybrids 490
GeneProtein Description Reference
PSI-P450 hybrids
Fusion enzyme of
rat CYP1A1 and
yeast NADPH-
P450 reductase (in
vitro)
Spinach chloroplasts were combined with
microsomes from yeast expressing the rat
CYP1A1CPR fusion enzyme In this system
NADP+ was photosynthetically reduced to
NADPH to supply the electrons for P450 thus
enabling light-driven conversion of 7-
ethoxycoumarin to 7-hydroxycoumarin
Kim et al
1996
CP79A1 from
Sorghum bicolor
(in vitro an in
vivo)
The ER-derived P450 CYP79A1 was capable of
converting tyrosine to hydroxyphenyl-
acetaldoxime employing ferredoxin reduced by
barley PSI (without the need for NADPH and
CPR) In the next step CYP79A1 was fused to
cyanobacterial PsaM or Arabidopsis ferredoxin
The engineered fusions exhibited light-driven
activity both in vivo and in vitro
Jensen et al
2011 Lassen
et al 2014b
Mellor et al
2016
CYP79A1
CYP71E1
UGT85B1 from
Sorghum bicolor
(in vivo)
The two P450s CYP79A1 and CYP71E1 and the
UDP-glucosyltransferase UGT85B1 were
targeted to N benthamiana or Synechocystis
thylakoid membranes where they converted
tyrosine to dhurrin employing photosynthetically
Nielsen et al
2013
Wlodarczyk et
al 2016
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25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
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26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
32
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566
Aigner H Wilson RH Bracher A Calisse L Bhat JY Hartl FU Hayer-Hartl M (2017) 567
Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
chloroplast-ferredoxin-hydrogenase system Proc Natl Acad Sci U S A 70 2317-2320 571
Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
complements ferredoxin deficiency in knocked-down transgenic tobacco plants Plant 574
J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
photosynthesis for energy production Curr Opin Chem Biol 17 457-461 577
Burgdorf T Lenz O Buhrke T van der Linden E Jones AK Albracht SP Friedrich B 578
(2005) [NiFe]-hydrogenases of Ralstonia eutropha H16 modular enzymes for 579
oxygen-tolerant biological hydrogen oxidation J Mol Microbiol Biotechnol 10 181-580
96 581
Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
(2010) Broad band enhancement of light absorption in photosystem I by metal 583
nanoparticle antennas Nano Lett 10 2069-2074 584
Carpenter SD Ohad I Vermaas WF (1993) Analysis of chimeric spinachcyanobacterial 585
CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
the water-splitting system of Photosystem II Biochim Biophys Acta 1144 204-212 587
Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
Eur J Biochem 260 833-843 593
Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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33
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(2017) Bioelectronic Circuit on a 3D Electrode Architecture Enzymatic Catalysis 599
Interconnected with Photosystem I J Am Chem Soc 139 16478-16481 600
Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel 601
genetic diversity Philos Trans R Soc Lond B Biol Sci 372 602
Das R Kiley PJ Segal M Norville J Yu AA Wang L Trammell SA Reddick LE 603
Kumar R Stellacci F Lebedev N Schnur J Bruce BD Zhang S Baldo M (2004) 604
Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
by thermal dissipation of excess energy Biochem Soc Trans 38 651-660 608
Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
device by direct chemical binding of the photosynthetic reaction center protein to 610
metal surfaces Advanced Materials 17 2434-2437 611
Frolov L Rosenwaks Y Richter S Carmeli C Carmeli I (2008) Photoelectric junctions 612
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13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I 617
Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
reinhardtii ACS Synth Biol 5 589-596 624
Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
state biophotovoltaic cells containing photosystem I Adv Mater 26 4863-4869 630
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DR Niyogi KK Long SP (2018) Photosystem II subunit S overexpression increases 632
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Gnanasekaran T Karcher D Nielsen AZ Martens HJ Ruf S Kroop X Olsen CE 634
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R Kargul JM (2018) Molecular mechanisms of photoadaptation of photosystem I 639
supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
harvesting chlorophyll ab-binding protein in Synechocystis sp PCC 6803 Eur J 643
Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
synthase is a highly divergent paralog of PsbA of photosystem II Science 353 646
Holt NE Fleming GR Niyogi KK (2004) Toward an understanding of the mechanism of 647
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Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
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66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
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c553 minimises charge recombination and enhances photovoltaic performance of the 660
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ACS Chem Biol 6 533-539 663
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Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
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Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
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Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
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Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
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by engineering crop photosynthesis and yield potential Cell 161 56-66 703
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Photosynth Res 116 277-293 705
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4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
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Proc Natl Acad Sci U S A 108 20988-20991 710
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production Biochemistry 49 10264-10266 713
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503-519 716
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hydrogenases J Biochem 123 644-649 718
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enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
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(Camb) 46 2557-2559 727
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
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Rev Plant Biol 64 609-635 741
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biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
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hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
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phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
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236-248 762
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24340-24354 767
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3619-3639 782
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2189 785
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134-145 788
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Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
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1585-1587 797
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
39
Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M 798
Iwai M Taguchi S Enami I Inoue Y Yamanoi Y Yonezawa T Mizuno K 799
Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M 800
(2007) Bio-photosensor Cyanobacterial photosystem I coupled with transistor via 801
molecular wire Biochim Biophys Acta 1767 653-659 802
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N 803
(2006) Functional replacement of ferredoxin by a cyanobacterial flavodoxin in 804
tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050 805
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
U S A 104 11495-11500 809
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M 810
Norici A Shotland Y Ohad I Kaplan A (2016) The mechanisms whereby the 811
green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled 812
photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
Photosystem I-catalyst hybrids Curr Opin Chem Biol 25 1-8 815
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium 816
Synechocystis sp PCC 6803 carrying spinach sequences Construction and function 817
Photosynth Res 48 147-162 818
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene 819
replacement in Synechocystis sp PCC 6803 Microb Cell Fact 13 4 820
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
thaliana J Biol Chem 278 31286-31289 826
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M 827
Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
dependent pathways into Synechocystis sp PCC 6803 Metab Eng 33 1-11 830
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40
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in 831
functional photosystem II complexes of cyanobacteria Proc Natl Acad Sci U S A 98 832
14168-14173 833
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) 834
Photosynthetic electron partitioning between [FeFe]-hydrogenase and 835
ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S 836
A 108 9396-9401 837
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of 838
alternative electron flow by flavodiiron proteins in Arabidopsis Nat Plants 2 16012 839
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ 840
(2018) Ectopic expression of SsPETE2 a plastocyanin from Suaeda salsa improves 841
plant tolerance to oxidative stress Plant Sci 268 1-10 842
843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS Lett 581 2768-2775Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
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Schmid VH (2008) Light-harvesting complexes of vascular plants Cell Mol Life Sci 65 3619-3639Pubmed Author and Title wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
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Shi T Bibby TS Jiang L Irwin AJ Falkowski PG (2005) Protein interactions limit the rate of evolution of photosynthetic genes incyanobacteria Mol Biol Evol 22 2179-2189
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Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T Sakai M Fujii M Tohri A Iwai M Inoue YYoneyama S Minakata M Enami I (2009) Plugging a molecular wire into photosystem I reconstitution of the photoelectric conversionsystem on a gold electrode Angew Chem Int Ed Engl 48 1585-1587
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
25
reduced ferredoxin
PSI-hydrogenase hybrids
Proteobacterial
[NiFe]
hydrogenase
genetically fused
to cyanobacterial
PSI (in vitro)
A fusion of cyanobacterial PsaE to an [NiFe]
hydrogenase from the -proteobacterium
Ralstonia eutropha was reconstituted into a
PsaE-deficient PSI from Synechocystis by self-
assembly In a modified version of this system
cytochrome c3 from Desulfovibrio vulgaris was
cross-linked to the docking site of ferredoxin in
PsaE targeting electrons directly from PSI via
cytochrome c3 to the hydrogenase This gave the
hydrogenase a competitive advantage over the
natural acceptors of electrons from PSI
In a third variant of this system the R eutropha
hydrogenase was genetically fused to
Synechocystis PsaE and reconstituted into a
PsaE-deficient PSI from Synechocystis His-
tagging of PsaF enabled assembly of the PSI-
hydrogenase hybrid onto a gold electrode
Ihara et al
2006a Ihara et
al 2006b
Krassen et al
2009
Green algal [FeFe]
hydrogenase
genetically fused
to ferredoxin (in
vitro)
The Chlamydomonas hydrogenase was fused to
ferredoxin This switched the bias of electron
transfer from FNR to hydrogenase and resulted
in an increased rate of hydrogen
photoproduction in vitro
Yacoby et al
2011
Bacterial [FeFe] To enable transfer of electrons from the terminal Lubner et al
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
32
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566
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Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
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Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
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J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
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Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
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Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
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Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
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Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
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Chem Biol 25 18-26 616
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I 617
Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
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Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
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Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
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DR Niyogi KK Long SP (2018) Photosystem II subunit S overexpression increases 632
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Gnanasekaran T Karcher D Nielsen AZ Martens HJ Ruf S Kroop X Olsen CE 634
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Haniewicz P Abram M Nosek L Kirkpatrick J El-Mohsnawy E Olmos JDJ Kouřil 638
R Kargul JM (2018) Molecular mechanisms of photoadaptation of photosystem I 639
supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
harvesting chlorophyll ab-binding protein in Synechocystis sp PCC 6803 Eur J 643
Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
synthase is a highly divergent paralog of PsbA of photosystem II Science 353 646
Holt NE Fleming GR Niyogi KK (2004) Toward an understanding of the mechanism of 647
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Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
D Kamachi T Okura I (2006a) Light-driven hydrogen production by a hybrid 650
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Photobiol 82 676-682 652
Ihara M Nakamoto H Kamachi T Okura I Maeda M (2006b) Photoinduced hydrogen 653
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Olmos JD Kargul J (2015) A quest for the artificial leaf Int J Biochem Cell Biol 656
66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
Pawlak D Kargul J (2017) Biofunctionalisation of p-doped silicon with cytochrome 659
c553 minimises charge recombination and enhances photovoltaic performance of the 660
all-solid-state photosystem I-based biophotoelectrode RSC Adv 7 47854-47866 661
Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations 662
ACS Chem Biol 6 533-539 663
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Jensen PE Leister D (2014) Chloroplast evolution structure and functions F1000Prime 664
Rep 6 40 665
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip 666
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2872-2873 668
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and 669
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hydrogen production by a hybrid complex of photosystem I and [NiFe]-hydrogenase 678
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Improving photosynthesis and crop productivity by accelerating recovery from 681
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Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
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Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future 702
by engineering crop photosynthesis and yield potential Cell 161 56-66 703
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Photosynth Res 116 277-293 705
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4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
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Proc Natl Acad Sci U S A 108 20988-20991 710
Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
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production Biochemistry 49 10264-10266 713
Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
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503-519 716
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hydrogenases J Biochem 123 644-649 718
Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
(2016) Fusion of ferredoxin and cytochrome P450 enables direct light-driven 720
biosynthesis ACS Chem Biol 11 1862-1869 721
Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous 722
enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
Y Nishihara H (2010) A photosensing system composed of photosystem I 725
molecular wire gold nanoparticle and double surfactants in water Chem Commun 726
(Camb) 46 2557-2559 727
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
(2009) Surface immobilization of PSI using vitamin K1-like molecular wires for 729
fabrication of a bio-photoelectrode J Nanosci Nanotechnol 9 1722-1726 730
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37
Molina-Heredia FP Wastl J Navarro JA Bendall DS Hervas M Howe CJ De La Rosa 731
MA (2003) Photosynthesis a new function for an old cytochrome Nature 424 33-34 732
Mullineaux CW Emlyn-Jones D (2005) State transitions an example of acclimation to 733
low-light stress J Exp Bot 56 389-393 734
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J 735
Nanosci Nanotechnol 9 1709-1713 736
Nguyen K Bruce BD (2014) Growing green electricity progress and strategies for use of 737
photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello 742
Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in 748
understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in 750
Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
complex Plant Cell 3 383-395 752
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
S Cazzaniga S Bassi R (2015) Heterologous expression of moss light-harvesting 764
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38
complex stress-related 1 (LHCSR1) the chlorophyll a-xanthophyll pigment-protein 765
complex catalyzing non-photochemical quenching in Nicotiana sp J Biol Chem 290 766
24340-24354 767
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins 768
Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
phosphatase TAP38 in LHCII dephosphorylation and thylakoid electron flow PLoS 771
Biol 8 e1000288 772
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
natural product biosynthesis Protoplasma 253 1197-1209 774
Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS 775
Lett 581 2768-2775 776
Schiffels J Pinkenburg O Schelden M Aboulnaga el-HA Baumann ME Selmer T 777
(2013) An innovative cloning platform enables large-scale production and maturation 778
of an oxygen-tolerant [NiFe]-hydrogenase from Cupriavidus necator in Escherichia 779
coli PLoS One 8 e6881 780
Schmid VH (2008) Light-harvesting complexes of vascular plants Cell Mol Life Sci 65 781
3619-3639 782
Shi T Bibby TS Jiang L Irwin AJ Falkowski PG (2005) Protein interactions limit the 783
rate of evolution of photosynthetic genes in cyanobacteria Mol Biol Evol 22 2179-784
2189 785
Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS 786
Protein Increases Electron Transport Rates and Biomass Yield Plant Physiol 175 787
134-145 788
Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J 789
(2017) Plasmon-induced absorption of blind chlorophylls in photosynthetic proteins 790
assembled on silver nanowires Nanoscale 9 10475-10486 791
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Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
Sakai M Fujii M Tohri A Iwai M Inoue Y Yoneyama S Minakata M Enami I 794
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1585-1587 797
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Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M 798
Iwai M Taguchi S Enami I Inoue Y Yamanoi Y Yonezawa T Mizuno K 799
Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M 800
(2007) Bio-photosensor Cyanobacterial photosystem I coupled with transistor via 801
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Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N 803
(2006) Functional replacement of ferredoxin by a cyanobacterial flavodoxin in 804
tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050 805
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
U S A 104 11495-11500 809
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M 810
Norici A Shotland Y Ohad I Kaplan A (2016) The mechanisms whereby the 811
green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled 812
photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
Photosystem I-catalyst hybrids Curr Opin Chem Biol 25 1-8 815
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium 816
Synechocystis sp PCC 6803 carrying spinach sequences Construction and function 817
Photosynth Res 48 147-162 818
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene 819
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Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
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Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M 827
Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
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40
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14168-14173 833
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) 834
Photosynthetic electron partitioning between [FeFe]-hydrogenase and 835
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Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of 838
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(2018) Ectopic expression of SsPETE2 a plastocyanin from Suaeda salsa improves 841
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843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
26
hydrogenase wired
to cyanobacterial
PSI (in vitro)
Fe4S4 cluster in PSI of Synechococcus sp PCC
7002 to the distal Fe4S4 cluster in the
hydrogenase from Clostridium acetobutylicum
the two components were covalently coupled to
each other via a molecular wire ndash the thiolated
organic molecule octanedithiol This allowed
electrons to tunnel through the wire from PSI to
the hydrogenase Self-assembly of the PSI-wire-
hydrogenase complex was obtained in vitro
2010 Lubner
et al 2011
491
492
493
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27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
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32
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566
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Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
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J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
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Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
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Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
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Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
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Frolov L Rosenwaks Y Richter S Carmeli C Carmeli I (2008) Photoelectric junctions 612
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13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I 617
Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
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Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
state biophotovoltaic cells containing photosystem I Adv Mater 26 4863-4869 630
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DR Niyogi KK Long SP (2018) Photosystem II subunit S overexpression increases 632
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Gnanasekaran T Karcher D Nielsen AZ Martens HJ Ruf S Kroop X Olsen CE 634
Motawie MS Pribil M Moller BL Bock R Jensen PE (2016) Transfer of the 635
cytochrome P450-dependent dhurrin pathway from Sorghum bicolor into Nicotiana 636
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Haniewicz P Abram M Nosek L Kirkpatrick J El-Mohsnawy E Olmos JDJ Kouřil 638
R Kargul JM (2018) Molecular mechanisms of photoadaptation of photosystem I 639
supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
harvesting chlorophyll ab-binding protein in Synechocystis sp PCC 6803 Eur J 643
Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
synthase is a highly divergent paralog of PsbA of photosystem II Science 353 646
Holt NE Fleming GR Niyogi KK (2004) Toward an understanding of the mechanism of 647
nonphotochemical quenching in green plants Biochemistry 43 8281-8289 648
Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
D Kamachi T Okura I (2006a) Light-driven hydrogen production by a hybrid 650
complex of a [NiFe]-hydrogenase and the cyanobacterial photosystem I Photochem 651
Photobiol 82 676-682 652
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production by direct electron transfer from photosystem I cross-linked with 654
cytochrome c3 to [NiFe]-hydrogenase Photochem Photobiol 82 1677-1685Janna 655
Olmos JD Kargul J (2015) A quest for the artificial leaf Int J Biochem Cell Biol 656
66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
Pawlak D Kargul J (2017) Biofunctionalisation of p-doped silicon with cytochrome 659
c553 minimises charge recombination and enhances photovoltaic performance of the 660
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Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations 662
ACS Chem Biol 6 533-539 663
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35
Jensen PE Leister D (2014) Chloroplast evolution structure and functions F1000Prime 664
Rep 6 40 665
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip 666
functionalization of carbon nanotubes with photosystem I J Am Chem Soc 132 667
2872-2873 668
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and 669
its application in biomimetic solar-to-fuel systems J Plant Physiol 169 1639-1653 670
Kargul J Bubak G Andryianau G (2018) Biophotovoltaic systems based on 671
photosynthetic complexes In Wandelt K (Ed) Encyclopedia of Interfacial 672
Chemistry Surface Science and Electrochemistry vol 7 pp 43-63 673
Kim YS Hara M Ikebukuro K Miyake J Ohkawa H Karube I (1996) Photo-induced 674
activation of cytochrome P450reductase fusion enzyme coupled with spinach 675
chloroplasts Biotechnol Tech 10 717minus720 676
Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic 677
hydrogen production by a hybrid complex of photosystem I and [NiFe]-hydrogenase 678
ACS Nano 3 4055-4061 679
Kromdijk J Glowacka K Leonelli L Gabilly ST Iwai M Niyogi KK Long SP (2016) 680
Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
Kubota H Sakurai I Katayama K Mizusawa N Ohashi S Kobayashi M Zhang P Aro 683
EM Wada H (2010) Purification and characterization of photosystem I complex 684
from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim 685
Biophys Acta 1797 98-105 686
Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future 702
by engineering crop photosynthesis and yield potential Cell 161 56-66 703
Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
(2011) Solar hydrogen-producing bionanodevice outperforms natural photosynthesis 709
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Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
production Biochemistry 49 10264-10266 713
Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
organisms using whole-cell and cell-free systems Appl Biochem Biotechnol 183 715
503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
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Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
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biosynthesis ACS Chem Biol 11 1862-1869 721
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enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
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37
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low-light stress J Exp Bot 56 389-393 734
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Nanosci Nanotechnol 9 1709-1713 736
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1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
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Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
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understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in 750
Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
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Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
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24340-24354 767
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Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
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Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
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2189 785
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134-145 788
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Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
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Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
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Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
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40
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843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
27
Table 4 Combination of PSI with non-biological materials bio-nano hybrids 494
System non-biological
components
Description Reference
H2-producing PSI bio-
nano hybrids
PSI-biohybrid photocatalytic systems for H2
production contain cyanobacterial PSI and
precious metal catalysts including platinum
nanoparticles platinum nanowires and
platinum nanoclusters Examples for earth-
abundant molecular catalysts in PSI-
biohybrids include cobaloxime Ni
diphosphine and Ni-apoflavodoxin
reviewed in
Kargul et al
2012
Fukuzumi
2015 Utschig
et al 2015
PSI-based
photocurrent-generating
bio-nano hybrids
PSI-based photocurrent-generating devices
contain PSI from either plants or
cyanobacteria immobilized on electrode
materials such as Au graphene indium tin
oxide (ITO) fluorine-doped tin oxide
(FTO) TiO2 glass ZnO or alumina The
most commonly utilized immobilization
strategies involve the usage of organothiol-
based self-assembled monolayers (SAMs)
Electron donors to PSI include sodium
ascorbate 26-dichlorophenolindophenol
reduced ferricyanide osmium complexes
ruthenium hexamine trichloride PSI or the
reviewed in
Nguyen and
Bruce 2014
Gordiichuk et
al 2014
Gizzie et al
2015 Janna
Olmos et al
2017
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
32
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566
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Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
chloroplast-ferredoxin-hydrogenase system Proc Natl Acad Sci U S A 70 2317-2320 571
Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
complements ferredoxin deficiency in knocked-down transgenic tobacco plants Plant 574
J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
photosynthesis for energy production Curr Opin Chem Biol 17 457-461 577
Burgdorf T Lenz O Buhrke T van der Linden E Jones AK Albracht SP Friedrich B 578
(2005) [NiFe]-hydrogenases of Ralstonia eutropha H16 modular enzymes for 579
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Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
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nanoparticle antennas Nano Lett 10 2069-2074 584
Carpenter SD Ohad I Vermaas WF (1993) Analysis of chimeric spinachcyanobacterial 585
CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
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Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
Eur J Biochem 260 833-843 593
Chida H Nakazawa A Akazaki H Hirano T Suruga K Ogawa M Satoh T Kadokura 594
K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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33
Ciornii D Riedel M Stieger KR Feifel SC Hejazi M Lokstein H Zouni A Lisdat F 598
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Interconnected with Photosystem I J Am Chem Soc 139 16478-16481 600
Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel 601
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Das R Kiley PJ Segal M Norville J Yu AA Wang L Trammell SA Reddick LE 603
Kumar R Stellacci F Lebedev N Schnur J Bruce BD Zhang S Baldo M (2004) 604
Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
by thermal dissipation of excess energy Biochem Soc Trans 38 651-660 608
Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
device by direct chemical binding of the photosynthetic reaction center protein to 610
metal surfaces Advanced Materials 17 2434-2437 611
Frolov L Rosenwaks Y Richter S Carmeli C Carmeli I (2008) Photoelectric junctions 612
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13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I 617
Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
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Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
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DR Niyogi KK Long SP (2018) Photosystem II subunit S overexpression increases 632
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Gnanasekaran T Karcher D Nielsen AZ Martens HJ Ruf S Kroop X Olsen CE 634
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tabacum chloroplasts for light-driven synthesis J Exp Bot 67 2495-2506 637
Haniewicz P Abram M Nosek L Kirkpatrick J El-Mohsnawy E Olmos JDJ Kouřil 638
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176 1433-1451 641
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Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
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Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
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Photobiol 82 676-682 652
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Olmos JD Kargul J (2015) A quest for the artificial leaf Int J Biochem Cell Biol 656
66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
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Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations 662
ACS Chem Biol 6 533-539 663
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35
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Rep 6 40 665
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip 666
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2872-2873 668
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and 669
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chloroplasts Biotechnol Tech 10 717minus720 676
Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic 677
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ACS Nano 3 4055-4061 679
Kromdijk J Glowacka K Leonelli L Gabilly ST Iwai M Niyogi KK Long SP (2016) 680
Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
Kubota H Sakurai I Katayama K Mizusawa N Ohashi S Kobayashi M Zhang P Aro 683
EM Wada H (2010) Purification and characterization of photosystem I complex 684
from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim 685
Biophys Acta 1797 98-105 686
Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future 702
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Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
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Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
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Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
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503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
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Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
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enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
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Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
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37
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low-light stress J Exp Bot 56 389-393 734
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Nanosci Nanotechnol 9 1709-1713 736
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photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
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Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
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understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
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Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
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Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
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24340-24354 767
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Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
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Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
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2189 785
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134-145 788
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Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
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photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
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Synechocystis sp PCC 6803 carrying spinach sequences Construction and function 817
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Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
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Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
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40
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843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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Ihara M Nakamoto H Kamachi T Okura I Maeda M (2006b) Photoinduced hydrogen production by direct electron transfer fromphotosystem I cross-linked with cytochrome c3 to [NiFe]-hydrogenase Photochem Photobiol 82 1677-1685Janna Olmos JD Kargul J(2015) A quest for the artificial leaf Int J Biochem Cell Biol 66 37-44
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Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-sensitive pathway of cyclic electron flow in plantsFront Plant Sci 4 161 wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
28
immobilization wire (NTAndashNindashHis6ndashPSI)
Acceptors of PSI electrons include
naphthoquinone-derivative molecular wire
methyl viologen oxidized ferricyanide
composite Bis-aniline nanoparticle-
ferredoxin and methylene blue Also all-
solid-state PSI-based solar cells that do not
employ any exogenous redox mediators or
buffer solutions have been generated
495
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29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
32
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566
Aigner H Wilson RH Bracher A Calisse L Bhat JY Hartl FU Hayer-Hartl M (2017) 567
Plant RuBisCo assembly in E coli with five chloroplast chaperones including BSD2 568
Science 358 1272-1278 569
Benemann JR Berenson JA Kaplan NO Kamen MD (1973) Hydrogen evolution by a 570
chloroplast-ferredoxin-hydrogenase system Proc Natl Acad Sci U S A 70 2317-2320 571
Blanco NE Ceccoli RD Segretin ME Poli HO Voss I Melzer M Bravo-Almonacid FF 572
Scheibe R Hajirezaei MR Carrillo N (2011) Cyanobacterial flavodoxin 573
complements ferredoxin deficiency in knocked-down transgenic tobacco plants Plant 574
J 65 922-935 575
Blankenship RE Chen M (2013) Spectral expansion and antenna reduction can enhance 576
photosynthesis for energy production Curr Opin Chem Biol 17 457-461 577
Burgdorf T Lenz O Buhrke T van der Linden E Jones AK Albracht SP Friedrich B 578
(2005) [NiFe]-hydrogenases of Ralstonia eutropha H16 modular enzymes for 579
oxygen-tolerant biological hydrogen oxidation J Mol Microbiol Biotechnol 10 181-580
96 581
Carmeli I Lieberman I Kraversky L Fan Z Govorov AO Markovich G Richter S 582
(2010) Broad band enhancement of light absorption in photosystem I by metal 583
nanoparticle antennas Nano Lett 10 2069-2074 584
Carpenter SD Ohad I Vermaas WF (1993) Analysis of chimeric spinachcyanobacterial 585
CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
the water-splitting system of Photosystem II Biochim Biophys Acta 1144 204-212 587
Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
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a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
Eur J Biochem 260 833-843 593
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K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
(2007) Expression of the algal cytochrome c6 gene in Arabidopsis enhances 596
photosynthesis and growth Plant Cell Physiol 48 948-957 597
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Ciornii D Riedel M Stieger KR Feifel SC Hejazi M Lokstein H Zouni A Lisdat F 598
(2017) Bioelectronic Circuit on a 3D Electrode Architecture Enzymatic Catalysis 599
Interconnected with Photosystem I J Am Chem Soc 139 16478-16481 600
Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel 601
genetic diversity Philos Trans R Soc Lond B Biol Sci 372 602
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devices Nano Letters 4 1079-1083 606
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between GaAs and photosynthetic reaction center protein J Phys Chem C 112 613
13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I 617
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176 1433-1451 641
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Biochem 263 561-570 644
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Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
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Photobiol 82 676-682 652
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66 37-44 657
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Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations 662
ACS Chem Biol 6 533-539 663
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Rep 6 40 665
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2872-2873 668
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and 669
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chloroplasts Biotechnol Tech 10 717minus720 676
Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic 677
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ACS Nano 3 4055-4061 679
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Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
Kubota H Sakurai I Katayama K Mizusawa N Ohashi S Kobayashi M Zhang P Aro 683
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from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim 685
Biophys Acta 1797 98-105 686
Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
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Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
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4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
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Proc Natl Acad Sci U S A 108 20988-20991 710
Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
production Biochemistry 49 10264-10266 713
Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
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503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
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Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
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enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
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Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
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37
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low-light stress J Exp Bot 56 389-393 734
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Nanosci Nanotechnol 9 1709-1713 736
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photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello 742
Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
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understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
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Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
complex Plant Cell 3 383-395 752
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
S Cazzaniga S Bassi R (2015) Heterologous expression of moss light-harvesting 764
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24340-24354 767
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Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
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Biol 8 e1000288 772
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
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Lett 581 2768-2775 776
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3619-3639 782
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2189 785
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Protein Increases Electron Transport Rates and Biomass Yield Plant Physiol 175 787
134-145 788
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Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
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Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
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Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
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Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
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Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
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40
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843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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Parsed CitationsAigner H Wilson RH Bracher A Calisse L Bhat JY Hartl FU Hayer-Hartl M (2017) Plant RuBisCo assembly in E coli with fivechloroplast chaperones including BSD2 Science 358 1272-1278
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
29
FIGURE LEGENDS 496
497
Figure 1 Subunit composition of cyanobacterial (Synechocystis) and plant 498
(Arabidopsis) thylakoid multiprotein complexes 499
Subunits specific to either the cyanobacterium Synechocystis or the flowering plant 500
Arabidopsis are indicated by black shading subunits with domains specific to one group of 501
organisms are shown in dark grey conserved subunits in light grey c6 cytochrome c6 Cyt 502
b6f cytochrome b6f complex Fd ferredoxin Fv flavodoxin FLV flavodiiron protein FNR 503
ferredoxin-NADP reductase LHCI (II) light-harvesting complex I (II) PSI (II) photosystem 504
I (II) 505
For reasons of clarity the ATP synthase and NAD(P)H dehydrogenase complex are not 506
shown 507
508
Figure 2 Overview of genetic engineering and synthetic biology approaches related to 509
the light reactions of photosynthesis 510
Different shading is used to indicate cyanobacterial (blue) and plant (green) proteins 511
(complexes) and proteins (complexes) that are typically not directly associated with 512
photosynthesis (red) Yellow shading indicates non-biological materials For designation of 513
proteins see Fig Box 1 514
515
Figure 3 Evolutionary plasticity of the photosynthetic proteome 516
The changes in the composition of the inventory of photosynthetic proteins (top panel) during 517
evolution from the cyanobacterial endosymbiont to the chloroplast in flowering plants 518
(bottom panel) are shown As proxies for the original endosymbiont and the unicellular 519
chloroplast-containing protist that gave rise to flowering plants the model cyanobacterium 520
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30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
32
References 565
566
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66 37-44 657
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ACS Nano 3 4055-4061 679
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Improving photosynthesis and crop productivity by accelerating recovery from 681
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Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
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Plant Sci 3 199 694
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enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
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Photosynth Res 116 277-293 705
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Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
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Rev Plant Biol 64 609-635 741
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biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
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hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
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236-248 762
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Adv Biochem Eng Biotechnol 158 111-136 769
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Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
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40
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843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
30
Synechocystis PCC6803 the model green alga C reinhardtii (middle) and the model 521
flowering plant A thaliana (right) are used In the top panel left side the entire inventory of 522
photosynthetic proteins in the Synechocystis PCC6803 is listed and assigned to the five 523
different classes ldquoPSIIrdquo ldquoPSIrdquo other electron transport components (ldquoother ETrdquo) ldquoantennardquo 524
and ldquophotoprotectionrdquo whereby the transition from ldquoother ETrdquo to ldquophotoprotectionrdquo is fluid 525
The proteins that have been acquired or lost during evolution in C reinhardtii and A thaliana 526
are listed in the middle and right section respectively of the top panel Note that for reasons 527
of simplicity we have not considered the ATP synthase complex in this figure The NDH 528
complex (or Nda2 in case of C reinhardtii) appears only as a whole (without its individual 529
subunits) in this figure NDH listed in parentheses indicates that the NDH complex is 530
specifically lost only in C reinhardtii and that therefore the plant NDH complex is not a re-531
acquisition Accordingly Nda2 replaces the NDH complex in C reinhardtii A detailed 532
catalogue of the indicated proteins with their full names functions and further literature links 533
is available in Supplemental Table 1 The bottom panel provides a sketch of the evolution of 534
flowering plants that traces back to the endosymbiosis between a unicellular eukaryote and a 535
cyanobacterium resulting (besides the red algal and glaucophyte lineages that are not shown) 536
in chloroplast-containing protists that further evolved to plants 537
538
Figure 4 Design of bio-bio hybrids 539
A Harnessing the reducing power of photosynthesis for cytochrome P450 enzymes (red) has 540
been demonstrated in vitro and in vivo In-vitro approaches were based either on a CPR-541
CYP1A1 fusion protein that could use NADPH produced by photosynthesis or on CYP79A1 542
that can directly utilize photoreduced ferredoxin The latter approach was also realized in 543
vivo by fusing CYP79A1 to ferredoxin (not shown) or the PSI subunit PsaM The most 544
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
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32
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Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
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Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
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Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
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Plant Sci 3 199 694
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enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
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Photosynth Res 116 277-293 705
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4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
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Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
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enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
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37
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Rev Plant Biol 64 609-635 741
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biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
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hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
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Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
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plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
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38
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Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
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Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
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2189 785
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134-145 788
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39
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Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
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Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
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40
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843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
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- Parsed Citations
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31
elaborate approach reported utilizes three enzymes (CYP79A1 CYP71E1 and UGT85B1) to 545
couple dhurrin synthesis with photosynthesis 546
B PSI-hydrogenase complexes are either based on genetic fusions of the hydrogenase (Hyd) 547
to PsaE or ferredoxin or on covalent linking of the hydrogenase and PSI via a molecular 548
wire Currently these bio-bio hybrids function only in vitro 549
550
Figure 5 Design of selected bio-nano hybrids 551
A PSI-platinum hybrids are generated by combining platinum nanoparticles (dots) or 552
nanoclusters (star) with PSI Platinum nanoparticles can also be linked to PSI via nanowires 553
B PSI-based photocurrent-generating system A variety of such systems have been 554
developed which consist of PSI molecules immobilized on electrodes and implement electron 555
transfer by means of diffusible redox mediators or nanowires Moreover all-solid-state PSI-556
based solar cells and systems in which cytochrome c was employed to interface PSI with 557
electrode materials have been generated (Gordiichuk et al 2014 Gizzie et al 2015 Janna 558
Olmos et al 2017 Ciornii et al 2017) The circle-containing cross indicates a current-using 559
device and the yellow rectangles symbolize the electrodes 560
561
562
563
564
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
32
References 565
566
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Carpenter SD Ohad I Vermaas WF (1993) Analysis of chimeric spinachcyanobacterial 585
CP43 mutants of Synechocystis sp PCC 6803 the chlorophyll-protein CP43 affects 586
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Chang H Huang HE Cheng CF Ho MH Ger MJ (2017) Constitutive expression of a 588
plant ferredoxin-like protein (pflp) enhances capacity of photosynthetic carbon 589
assimilation in rice (Oryza sativa) Transgenic Res 26 279-289 590
Chiaramonte S Giacometti GM Bergantino E (1999) Construction and characterization of 591
a functional mutant of Synechocystis 6803 harbouring a eukaryotic PSII-H subunit 592
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K Yamada S Hakamata W Isobe K Ito T Ishii R Nishio T Sonoike K Oku T 595
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photosynthesis and growth Plant Cell Physiol 48 948-957 597
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(2017) Bioelectronic Circuit on a 3D Electrode Architecture Enzymatic Catalysis 599
Interconnected with Photosystem I J Am Chem Soc 139 16478-16481 600
Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel 601
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13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
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176 1433-1451 641
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Photobiol 82 676-682 652
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66 37-44 657
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ACS Chem Biol 6 533-539 663
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ACS Nano 3 4055-4061 679
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Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
Kubota H Sakurai I Katayama K Mizusawa N Ohashi S Kobayashi M Zhang P Aro 683
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from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim 685
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Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
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Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
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4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
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Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
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Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
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McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
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Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
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biosynthesis ACS Chem Biol 11 1862-1869 721
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enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
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(Camb) 46 2557-2559 727
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
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37
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low-light stress J Exp Bot 56 389-393 734
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J 735
Nanosci Nanotechnol 9 1709-1713 736
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photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello 742
Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in 748
understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in 750
Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
complex Plant Cell 3 383-395 752
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
S Cazzaniga S Bassi R (2015) Heterologous expression of moss light-harvesting 764
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38
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24340-24354 767
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins 768
Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
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Biol 8 e1000288 772
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
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Lett 581 2768-2775 776
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3619-3639 782
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2189 785
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Protein Increases Electron Transport Rates and Biomass Yield Plant Physiol 175 787
134-145 788
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Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
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39
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Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
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Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
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Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
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40
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Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) 834
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843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
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32
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33
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Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
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Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
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DR Niyogi KK Long SP (2018) Photosystem II subunit S overexpression increases 632
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Gnanasekaran T Karcher D Nielsen AZ Martens HJ Ruf S Kroop X Olsen CE 634
Motawie MS Pribil M Moller BL Bock R Jensen PE (2016) Transfer of the 635
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tabacum chloroplasts for light-driven synthesis J Exp Bot 67 2495-2506 637
Haniewicz P Abram M Nosek L Kirkpatrick J El-Mohsnawy E Olmos JDJ Kouřil 638
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176 1433-1451 641
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Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
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Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
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Photobiol 82 676-682 652
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Olmos JD Kargul J (2015) A quest for the artificial leaf Int J Biochem Cell Biol 656
66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
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Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations 662
ACS Chem Biol 6 533-539 663
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35
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Rep 6 40 665
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip 666
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2872-2873 668
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and 669
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chloroplasts Biotechnol Tech 10 717minus720 676
Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic 677
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ACS Nano 3 4055-4061 679
Kromdijk J Glowacka K Leonelli L Gabilly ST Iwai M Niyogi KK Long SP (2016) 680
Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
Kubota H Sakurai I Katayama K Mizusawa N Ohashi S Kobayashi M Zhang P Aro 683
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from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim 685
Biophys Acta 1797 98-105 686
Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future 702
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Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
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Proc Natl Acad Sci U S A 108 20988-20991 710
Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
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Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
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503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
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Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
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enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
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Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
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37
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low-light stress J Exp Bot 56 389-393 734
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Nanosci Nanotechnol 9 1709-1713 736
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photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
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Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
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understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
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Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
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Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
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24340-24354 767
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Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
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Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
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Lett 581 2768-2775 776
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2189 785
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134-145 788
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Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
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photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
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Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
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Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
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40
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843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel genetic diversity Philos Trans R Soc Lond BBiol Sci 372
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Das R Kiley PJ Segal M Norville J Yu AA Wang L Trammell SA Reddick LE Kumar R Stellacci F Lebedev N Schnur J Bruce BDZhang S Baldo M (2004) Integration of photosynthetic protein molecular complexes in solid-state electronic devices Nano Letters 41079-1083
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wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic device by direct chemical binding of thephotosynthetic reaction center protein to metal surfaces Advanced Materials 17 2434-2437
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Frolov L Rosenwaks Y Richter S Carmeli C Carmeli I (2008) Photoelectric junctions between GaAs and photosynthetic reactioncenter protein J Phys Chem C 112 13426-13430
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Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin Chem Biol 25 18-26Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I Sergani S Carmeli I (2012) Photocurrent of a singlephotosynthetic protein Nat Nanotechnol 7 673-676
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Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of hydrogenases Photosynth Res 125 383-93Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-gene photosystem II core in the chloroplast of thegreen algae Chlamydomonas reinhardtii ACS Synth Biol 5 589-596
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Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576
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Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M Gautier DA Catarci S Pesce D Richter S Blom PWHerrmann A (2014) Solid-state biophotovoltaic cells containing photosystem I Adv Mater 26 4863-4869
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Glowacka K Kromdijk J Kucera K Xie J Cavanagh AP Leonelli L Leakey ADB Ort DR Niyogi KK Long SP (2018) Photosystem IIsubunit S overexpression increases the efficiency of water use in a field-grown crop Nat Commun 9 868
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
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33
Ciornii D Riedel M Stieger KR Feifel SC Hejazi M Lokstein H Zouni A Lisdat F 598
(2017) Bioelectronic Circuit on a 3D Electrode Architecture Enzymatic Catalysis 599
Interconnected with Photosystem I J Am Chem Soc 139 16478-16481 600
Dann M Leister D (2017) Enhancing (crop) plant photosynthesis by introducing novel 601
genetic diversity Philos Trans R Soc Lond B Biol Sci 372 602
Das R Kiley PJ Segal M Norville J Yu AA Wang L Trammell SA Reddick LE 603
Kumar R Stellacci F Lebedev N Schnur J Bruce BD Zhang S Baldo M (2004) 604
Integration of photosynthetic protein molecular complexes in solid-state electronic 605
devices Nano Letters 4 1079-1083 606
de Bianchi S Ballottari M Dallosto L Bassi R (2010) Regulation of plant light harvesting 607
by thermal dissipation of excess energy Biochem Soc Trans 38 651-660 608
Frolov L Rosenwaks Y Carmeli C Carmeli I (2005) Fabrication of a photoelectronic 609
device by direct chemical binding of the photosynthetic reaction center protein to 610
metal surfaces Advanced Materials 17 2434-2437 611
Frolov L Rosenwaks Y Richter S Carmeli C Carmeli I (2008) Photoelectric junctions 612
between GaAs and photosynthetic reaction center protein J Phys Chem C 112 613
13426-13430 614
Fukuzumi S (2015) Artificial photosynthetic systems for production of hydrogen Curr Opin 615
Chem Biol 25 18-26 616
Gerster D Reichert J Bi H Barth JV Kaniber SM Holleitner AW Visoly-Fisher I 617
Sergani S Carmeli I (2012) Photocurrent of a single photosynthetic protein Nat 618
Nanotechnol 7 673-676 619
Ghirardi ML (2015) Implementation of photobiological H2 production the O2 sensitivity of 620
hydrogenases Photosynth Res 125 383-93 621
Gimpel JA Nour-Eldin HH Scranton MA Li D Mayfield SP (2016) Refactoring the six-622
gene photosystem II core in the chloroplast of the green algae Chlamydomonas 623
reinhardtii ACS Synth Biol 5 589-596 624
Gizzie EA Niezgoda JS Robinson MT Harris AG Jennings GK Rosenthal SJ 625
Cliffel DE (2015) Photosystem I-polyanilineTiO2 solid-state solar cells simple 626
devices for biohybrid solar energy conversion Energy Environ Sci 8 3572-3576 627
Gordiichuk PI Wetzelaer GJ Rimmerman D Gruszka A de Vries JW Saller M 628
Gautier DA Catarci S Pesce D Richter S Blom PW Herrmann A (2014) Solid-629
state biophotovoltaic cells containing photosystem I Adv Mater 26 4863-4869 630
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
34
Glowacka K Kromdijk J Kucera K Xie J Cavanagh AP Leonelli L Leakey ADB Ort 631
DR Niyogi KK Long SP (2018) Photosystem II subunit S overexpression increases 632
the efficiency of water use in a field-grown crop Nat Commun 9 868 633
Gnanasekaran T Karcher D Nielsen AZ Martens HJ Ruf S Kroop X Olsen CE 634
Motawie MS Pribil M Moller BL Bock R Jensen PE (2016) Transfer of the 635
cytochrome P450-dependent dhurrin pathway from Sorghum bicolor into Nicotiana 636
tabacum chloroplasts for light-driven synthesis J Exp Bot 67 2495-2506 637
Haniewicz P Abram M Nosek L Kirkpatrick J El-Mohsnawy E Olmos JDJ Kouřil 638
R Kargul JM (2018) Molecular mechanisms of photoadaptation of photosystem I 639
supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
harvesting chlorophyll ab-binding protein in Synechocystis sp PCC 6803 Eur J 643
Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
synthase is a highly divergent paralog of PsbA of photosystem II Science 353 646
Holt NE Fleming GR Niyogi KK (2004) Toward an understanding of the mechanism of 647
nonphotochemical quenching in green plants Biochemistry 43 8281-8289 648
Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
D Kamachi T Okura I (2006a) Light-driven hydrogen production by a hybrid 650
complex of a [NiFe]-hydrogenase and the cyanobacterial photosystem I Photochem 651
Photobiol 82 676-682 652
Ihara M Nakamoto H Kamachi T Okura I Maeda M (2006b) Photoinduced hydrogen 653
production by direct electron transfer from photosystem I cross-linked with 654
cytochrome c3 to [NiFe]-hydrogenase Photochem Photobiol 82 1677-1685Janna 655
Olmos JD Kargul J (2015) A quest for the artificial leaf Int J Biochem Cell Biol 656
66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
Pawlak D Kargul J (2017) Biofunctionalisation of p-doped silicon with cytochrome 659
c553 minimises charge recombination and enhances photovoltaic performance of the 660
all-solid-state photosystem I-based biophotoelectrode RSC Adv 7 47854-47866 661
Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations 662
ACS Chem Biol 6 533-539 663
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
35
Jensen PE Leister D (2014) Chloroplast evolution structure and functions F1000Prime 664
Rep 6 40 665
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip 666
functionalization of carbon nanotubes with photosystem I J Am Chem Soc 132 667
2872-2873 668
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and 669
its application in biomimetic solar-to-fuel systems J Plant Physiol 169 1639-1653 670
Kargul J Bubak G Andryianau G (2018) Biophotovoltaic systems based on 671
photosynthetic complexes In Wandelt K (Ed) Encyclopedia of Interfacial 672
Chemistry Surface Science and Electrochemistry vol 7 pp 43-63 673
Kim YS Hara M Ikebukuro K Miyake J Ohkawa H Karube I (1996) Photo-induced 674
activation of cytochrome P450reductase fusion enzyme coupled with spinach 675
chloroplasts Biotechnol Tech 10 717minus720 676
Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic 677
hydrogen production by a hybrid complex of photosystem I and [NiFe]-hydrogenase 678
ACS Nano 3 4055-4061 679
Kromdijk J Glowacka K Leonelli L Gabilly ST Iwai M Niyogi KK Long SP (2016) 680
Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
Kubota H Sakurai I Katayama K Mizusawa N Ohashi S Kobayashi M Zhang P Aro 683
EM Wada H (2010) Purification and characterization of photosystem I complex 684
from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim 685
Biophys Acta 1797 98-105 686
Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future 702
by engineering crop photosynthesis and yield potential Cell 161 56-66 703
Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
(2011) Solar hydrogen-producing bionanodevice outperforms natural photosynthesis 709
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Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
production Biochemistry 49 10264-10266 713
Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
organisms using whole-cell and cell-free systems Appl Biochem Biotechnol 183 715
503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
hydrogenases J Biochem 123 644-649 718
Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
(2016) Fusion of ferredoxin and cytochrome P450 enables direct light-driven 720
biosynthesis ACS Chem Biol 11 1862-1869 721
Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous 722
enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
Y Nishihara H (2010) A photosensing system composed of photosystem I 725
molecular wire gold nanoparticle and double surfactants in water Chem Commun 726
(Camb) 46 2557-2559 727
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
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37
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Mullineaux CW Emlyn-Jones D (2005) State transitions an example of acclimation to 733
low-light stress J Exp Bot 56 389-393 734
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J 735
Nanosci Nanotechnol 9 1709-1713 736
Nguyen K Bruce BD (2014) Growing green electricity progress and strategies for use of 737
photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello 742
Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in 748
understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in 750
Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
complex Plant Cell 3 383-395 752
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
S Cazzaniga S Bassi R (2015) Heterologous expression of moss light-harvesting 764
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38
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24340-24354 767
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins 768
Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
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Biol 8 e1000288 772
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
natural product biosynthesis Protoplasma 253 1197-1209 774
Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS 775
Lett 581 2768-2775 776
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3619-3639 782
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2189 785
Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS 786
Protein Increases Electron Transport Rates and Biomass Yield Plant Physiol 175 787
134-145 788
Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J 789
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Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
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Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M 800
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Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N 803
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tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050 805
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
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Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M 810
Norici A Shotland Y Ohad I Kaplan A (2016) The mechanisms whereby the 811
green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled 812
photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
Photosystem I-catalyst hybrids Curr Opin Chem Biol 25 1-8 815
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Synechocystis sp PCC 6803 carrying spinach sequences Construction and function 817
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Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
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Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
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40
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843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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Ihara M Nakamoto H Kamachi T Okura I Maeda M (2006b) Photoinduced hydrogen production by direct electron transfer fromphotosystem I cross-linked with cytochrome c3 to [NiFe]-hydrogenase Photochem Photobiol 82 1677-1685Janna Olmos JD Kargul J(2015) A quest for the artificial leaf Int J Biochem Cell Biol 66 37-44
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Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M Pawlak D Kargul J (2017) Biofunctionalisation of p-doped silicon with cytochrome c553 minimises charge recombination and enhances photovoltaic performance of the all-solid-statephotosystem I-based biophotoelectrode RSC Adv 7 47854-47866
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations ACS Chem Biol 6 533-539Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Jensen PE Leister D (2014) Chloroplast evolution structure and functions F1000Prime Rep 6 40Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip functionalization of carbon nanotubes withphotosystem I J Am Chem Soc 132 2872-2873
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and its application in biomimetic solar-to-fuelsystems J Plant Physiol 169 1639-1653
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Kargul J Bubak G Andryianau G (2018) Biophotovoltaic systems based on photosynthetic complexes In Wandelt K (Ed)Encyclopedia of Interfacial Chemistry Surface Science and Electrochemistry vol 7 pp 43-63
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Kim YS Hara M Ikebukuro K Miyake J Ohkawa H Karube I (1996) Photo-induced activation of cytochrome P450reductase fusionenzyme coupled with spinach chloroplasts Biotechnol Tech 10 717minus720
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic hydrogen production by a hybrid complex ofphotosystem I and [NiFe]-hydrogenase ACS Nano 3 4055-4061
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Kromdijk J Glowacka K Leonelli L Gabilly ST Iwai M Niyogi KK Long SP (2016) Improving photosynthesis and crop productivity byaccelerating recovery from photoprotection Science 354 857-861
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Kubota H Sakurai I Katayama K Mizusawa N Ohashi S Kobayashi M Zhang P Aro EM Wada H (2010) Purification andcharacterization of photosystem I complex from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim BiophysActa 1797 98-105
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) Redirecting photosynthetic electron flow into light-driven synthesis of alternative products including high-value bioactive natural compounds ACS Synth Biol 3 1-12
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) Anchoring a plant cytochrome P450 via PsaM tothe thylakoids in Synechococcus sp PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184
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Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front Plant Sci 3 199
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of enhancing chloroplast functions EssaysBiochem DOI 101042EBC20170010
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Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-sensitive pathway of cyclic electron flow in plantsFront Plant Sci 4 161 wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
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Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) Overexpression of ferredoxin PETF enhances tolerance toheat stress in Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929
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Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future by engineering crop photosynthesis and yieldpotential Cell 161 56-66
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status Photosynth Res 116 277-293Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-4148Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH (2011) Solar hydrogen-producing bionanodeviceoutperforms natural photosynthesis Proc Natl Acad Sci U S A 108 20988-20991
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Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) Wiring an [FeFe]-hydrogenase with photosystem Ifor light-induced hydrogen production Biochemistry 49 10264-10266
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Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic organisms using whole-cell and cell-free systemsAppl Biochem Biotechnol 183 503-519
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McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to hydrogenases J Biochem 123 644-649Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE (2016) Fusion of ferredoxin and cytochrome P450enables direct light-driven biosynthesis ACS Chem Biol 11 1862-1869
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Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous enzymes the role of electron carrierproteins Photosynth Res 134 329-342
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Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue Y Nishihara H (2010) A photosensing systemcomposed of photosystem I molecular wire gold nanoparticle and double surfactants in water Chem Commun (Camb) 46 2557-2559
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Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y (2009) Surface immobilization of PSI using vitaminK1-like molecular wires for fabrication of a bio-photoelectrode J Nanosci Nanotechnol 9 1722-1726
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Molina-Heredia FP Wastl J Navarro JA Bendall DS Hervas M Howe CJ De La Rosa MA (2003) Photosynthesis a new function for anold cytochrome Nature 424 33-34
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Mullineaux CW Emlyn-Jones D (2005) State transitions an example of acclimation to low-light stress J Exp Bot 56 389-393Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J Nanosci Nanotechnol 9 1709-1713Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nguyen K Bruce BD (2014) Growing green electricity progress and strategies for use of photosystem I for sustainable photovoltaicenergy conversion Biochim Biophys Acta 1837 1553-1566 wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
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Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu Rev Plant Biol 64 609-635Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello Ramos HdJM King BC Bakowski K Jensen PE (2016)Extending the biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102
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Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) Redirecting photosynthetic reducing powertoward bioactive natural product synthesis ACS Synth Biol 2 308-315
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Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in understanding the assembly and repair of photosystem IIAnn Bot 106 1-16
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Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in Synechocystis 6803 yields a functional hybridphotosystem II reaction center complex Plant Cell 3 383-395
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Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for hydrogen production from microalgae PlantBiotechnol J 14 1487-99
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Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G Rappaport F Masiero S Furini A Jahns P Leister D (2009)Mutants overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of plastocyanin in photosyntheticelectron flow and thylakoid redox state Mol Plant 2 236-248
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Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi S Cazzaniga S Bassi R (2015) Heterologousexpression of moss light-harvesting complex stress-related 1 (LHCSR1) the chlorophyll a-xanthophyll pigment-protein complexcatalyzing non-photochemical quenching in Nicotiana sp J Biol Chem 290 24340-24354
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Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein phosphatase TAP38 in LHCII dephosphorylation andthylakoid electron flow PLoS Biol 8 e1000288
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Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in natural product biosynthesis Protoplasma253 1197-1209
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Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS Lett 581 2768-2775Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Schiffels J Pinkenburg O Schelden M Aboulnaga el-HA Baumann ME Selmer T (2013) An innovative cloning platform enables large-scale production and maturation of an oxygen-tolerant [NiFe]-hydrogenase from Cupriavidus necator in Escherichia coli PLoS One 8e6881
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
34
Glowacka K Kromdijk J Kucera K Xie J Cavanagh AP Leonelli L Leakey ADB Ort 631
DR Niyogi KK Long SP (2018) Photosystem II subunit S overexpression increases 632
the efficiency of water use in a field-grown crop Nat Commun 9 868 633
Gnanasekaran T Karcher D Nielsen AZ Martens HJ Ruf S Kroop X Olsen CE 634
Motawie MS Pribil M Moller BL Bock R Jensen PE (2016) Transfer of the 635
cytochrome P450-dependent dhurrin pathway from Sorghum bicolor into Nicotiana 636
tabacum chloroplasts for light-driven synthesis J Exp Bot 67 2495-2506 637
Haniewicz P Abram M Nosek L Kirkpatrick J El-Mohsnawy E Olmos JDJ Kouřil 638
R Kargul JM (2018) Molecular mechanisms of photoadaptation of photosystem I 639
supercomplex from an evolutionary cyanobacterialalgal intermediate Plant Physiol 640
176 1433-1451 641
He Q Schlich T Paulsen H Vermaas W (1999) Expression of a higher plant light-642
harvesting chlorophyll ab-binding protein in Synechocystis sp PCC 6803 Eur J 643
Biochem 263 561-570 644
Ho MY Shen G Canniffe DP Zhao C Bryant DA (2016) Light-dependent chlorophyll f 645
synthase is a highly divergent paralog of PsbA of photosystem II Science 353 646
Holt NE Fleming GR Niyogi KK (2004) Toward an understanding of the mechanism of 647
nonphotochemical quenching in green plants Biochemistry 43 8281-8289 648
Ihara M Nishihara H Yoon KS Lenz O Friedrich B Nakamoto H Kojima K Honma 649
D Kamachi T Okura I (2006a) Light-driven hydrogen production by a hybrid 650
complex of a [NiFe]-hydrogenase and the cyanobacterial photosystem I Photochem 651
Photobiol 82 676-682 652
Ihara M Nakamoto H Kamachi T Okura I Maeda M (2006b) Photoinduced hydrogen 653
production by direct electron transfer from photosystem I cross-linked with 654
cytochrome c3 to [NiFe]-hydrogenase Photochem Photobiol 82 1677-1685Janna 655
Olmos JD Kargul J (2015) A quest for the artificial leaf Int J Biochem Cell Biol 656
66 37-44 657
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M 658
Pawlak D Kargul J (2017) Biofunctionalisation of p-doped silicon with cytochrome 659
c553 minimises charge recombination and enhances photovoltaic performance of the 660
all-solid-state photosystem I-based biophotoelectrode RSC Adv 7 47854-47866 661
Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations 662
ACS Chem Biol 6 533-539 663
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
35
Jensen PE Leister D (2014) Chloroplast evolution structure and functions F1000Prime 664
Rep 6 40 665
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip 666
functionalization of carbon nanotubes with photosystem I J Am Chem Soc 132 667
2872-2873 668
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and 669
its application in biomimetic solar-to-fuel systems J Plant Physiol 169 1639-1653 670
Kargul J Bubak G Andryianau G (2018) Biophotovoltaic systems based on 671
photosynthetic complexes In Wandelt K (Ed) Encyclopedia of Interfacial 672
Chemistry Surface Science and Electrochemistry vol 7 pp 43-63 673
Kim YS Hara M Ikebukuro K Miyake J Ohkawa H Karube I (1996) Photo-induced 674
activation of cytochrome P450reductase fusion enzyme coupled with spinach 675
chloroplasts Biotechnol Tech 10 717minus720 676
Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic 677
hydrogen production by a hybrid complex of photosystem I and [NiFe]-hydrogenase 678
ACS Nano 3 4055-4061 679
Kromdijk J Glowacka K Leonelli L Gabilly ST Iwai M Niyogi KK Long SP (2016) 680
Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
Kubota H Sakurai I Katayama K Mizusawa N Ohashi S Kobayashi M Zhang P Aro 683
EM Wada H (2010) Purification and characterization of photosystem I complex 684
from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim 685
Biophys Acta 1797 98-105 686
Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future 702
by engineering crop photosynthesis and yield potential Cell 161 56-66 703
Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
(2011) Solar hydrogen-producing bionanodevice outperforms natural photosynthesis 709
Proc Natl Acad Sci U S A 108 20988-20991 710
Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
production Biochemistry 49 10264-10266 713
Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
organisms using whole-cell and cell-free systems Appl Biochem Biotechnol 183 715
503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
hydrogenases J Biochem 123 644-649 718
Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
(2016) Fusion of ferredoxin and cytochrome P450 enables direct light-driven 720
biosynthesis ACS Chem Biol 11 1862-1869 721
Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous 722
enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
Y Nishihara H (2010) A photosensing system composed of photosystem I 725
molecular wire gold nanoparticle and double surfactants in water Chem Commun 726
(Camb) 46 2557-2559 727
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
(2009) Surface immobilization of PSI using vitamin K1-like molecular wires for 729
fabrication of a bio-photoelectrode J Nanosci Nanotechnol 9 1722-1726 730
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
37
Molina-Heredia FP Wastl J Navarro JA Bendall DS Hervas M Howe CJ De La Rosa 731
MA (2003) Photosynthesis a new function for an old cytochrome Nature 424 33-34 732
Mullineaux CW Emlyn-Jones D (2005) State transitions an example of acclimation to 733
low-light stress J Exp Bot 56 389-393 734
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J 735
Nanosci Nanotechnol 9 1709-1713 736
Nguyen K Bruce BD (2014) Growing green electricity progress and strategies for use of 737
photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello 742
Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in 748
understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in 750
Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
complex Plant Cell 3 383-395 752
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
S Cazzaniga S Bassi R (2015) Heterologous expression of moss light-harvesting 764
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
38
complex stress-related 1 (LHCSR1) the chlorophyll a-xanthophyll pigment-protein 765
complex catalyzing non-photochemical quenching in Nicotiana sp J Biol Chem 290 766
24340-24354 767
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins 768
Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
phosphatase TAP38 in LHCII dephosphorylation and thylakoid electron flow PLoS 771
Biol 8 e1000288 772
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
natural product biosynthesis Protoplasma 253 1197-1209 774
Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS 775
Lett 581 2768-2775 776
Schiffels J Pinkenburg O Schelden M Aboulnaga el-HA Baumann ME Selmer T 777
(2013) An innovative cloning platform enables large-scale production and maturation 778
of an oxygen-tolerant [NiFe]-hydrogenase from Cupriavidus necator in Escherichia 779
coli PLoS One 8 e6881 780
Schmid VH (2008) Light-harvesting complexes of vascular plants Cell Mol Life Sci 65 781
3619-3639 782
Shi T Bibby TS Jiang L Irwin AJ Falkowski PG (2005) Protein interactions limit the 783
rate of evolution of photosynthetic genes in cyanobacteria Mol Biol Evol 22 2179-784
2189 785
Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS 786
Protein Increases Electron Transport Rates and Biomass Yield Plant Physiol 175 787
134-145 788
Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J 789
(2017) Plasmon-induced absorption of blind chlorophylls in photosynthetic proteins 790
assembled on silver nanowires Nanoscale 9 10475-10486 791
792
Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
Sakai M Fujii M Tohri A Iwai M Inoue Y Yoneyama S Minakata M Enami I 794
(2009) Plugging a molecular wire into photosystem I reconstitution of the 795
photoelectric conversion system on a gold electrode Angew Chem Int Ed Engl 48 796
1585-1587 797
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39
Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M 798
Iwai M Taguchi S Enami I Inoue Y Yamanoi Y Yonezawa T Mizuno K 799
Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M 800
(2007) Bio-photosensor Cyanobacterial photosystem I coupled with transistor via 801
molecular wire Biochim Biophys Acta 1767 653-659 802
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N 803
(2006) Functional replacement of ferredoxin by a cyanobacterial flavodoxin in 804
tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050 805
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
U S A 104 11495-11500 809
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M 810
Norici A Shotland Y Ohad I Kaplan A (2016) The mechanisms whereby the 811
green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled 812
photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
Photosystem I-catalyst hybrids Curr Opin Chem Biol 25 1-8 815
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium 816
Synechocystis sp PCC 6803 carrying spinach sequences Construction and function 817
Photosynth Res 48 147-162 818
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene 819
replacement in Synechocystis sp PCC 6803 Microb Cell Fact 13 4 820
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
thaliana J Biol Chem 278 31286-31289 826
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M 827
Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
dependent pathways into Synechocystis sp PCC 6803 Metab Eng 33 1-11 830
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40
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in 831
functional photosystem II complexes of cyanobacteria Proc Natl Acad Sci U S A 98 832
14168-14173 833
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) 834
Photosynthetic electron partitioning between [FeFe]-hydrogenase and 835
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A 108 9396-9401 837
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of 838
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(2018) Ectopic expression of SsPETE2 a plastocyanin from Suaeda salsa improves 841
plant tolerance to oxidative stress Plant Sci 268 1-10 842
843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for hydrogen production from microalgae PlantBiotechnol J 14 1487-99
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein phosphorylation in thylakoids of flowering plants theroles of STN7 STN8 and TAP38 Biochim Biophys Acta 1807 887-896
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G Rappaport F Masiero S Furini A Jahns P Leister D (2009)Mutants overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of plastocyanin in photosyntheticelectron flow and thylakoid redox state Mol Plant 2 236-248
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi S Cazzaniga S Bassi R (2015) Heterologousexpression of moss light-harvesting complex stress-related 1 (LHCSR1) the chlorophyll a-xanthophyll pigment-protein complexcatalyzing non-photochemical quenching in Nicotiana sp J Biol Chem 290 24340-24354
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins Adv Biochem Eng Biotechnol 158 111-136Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein phosphatase TAP38 in LHCII dephosphorylation andthylakoid electron flow PLoS Biol 8 e1000288
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in natural product biosynthesis Protoplasma253 1197-1209
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS Lett 581 2768-2775Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Schiffels J Pinkenburg O Schelden M Aboulnaga el-HA Baumann ME Selmer T (2013) An innovative cloning platform enables large-scale production and maturation of an oxygen-tolerant [NiFe]-hydrogenase from Cupriavidus necator in Escherichia coli PLoS One 8e6881
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Schmid VH (2008) Light-harvesting complexes of vascular plants Cell Mol Life Sci 65 3619-3639Pubmed Author and Title wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Google Scholar Author Only Title Only Author and Title
Shi T Bibby TS Jiang L Irwin AJ Falkowski PG (2005) Protein interactions limit the rate of evolution of photosynthetic genes incyanobacteria Mol Biol Evol 22 2179-2189
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS Protein Increases Electron Transport Ratesand Biomass Yield Plant Physiol 175 134-145
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J (2017) Plasmon-induced absorption of blindchlorophylls in photosynthetic proteins assembled on silver nanowires Nanoscale 9 10475-10486
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T Sakai M Fujii M Tohri A Iwai M Inoue YYoneyama S Minakata M Enami I (2009) Plugging a molecular wire into photosystem I reconstitution of the photoelectric conversionsystem on a gold electrode Angew Chem Int Ed Engl 48 1585-1587
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M Iwai M Taguchi S Enami I Inoue Y Yamanoi YYonezawa T Mizuno K Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M (2007) Bio-photosensorCyanobacterial photosystem I coupled with transistor via molecular wire Biochim Biophys Acta 1767 653-659
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N (2006) Functional replacement of ferredoxin by acyanobacterial flavodoxin in tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR Carrillo N (2007) Enhanced plant tolerance to ironstarvation by functional substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci U S A 104 11495-11500
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M Norici A Shotland Y Ohad I Kaplan A (2016) Themechanisms whereby the green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled photodamage resistanceNew Phytol 210 1229-1243
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from Photosystem I-catalyst hybrids Curr Opin Chem Biol25 1-8
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium Synechocystis sp PCC 6803 carrying spinachsequences Construction and function Photosynth Res 48 147-162
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene replacement in Synechocystis sp PCC 6803Microb Cell Fact 13 4
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron Protein Substitutes for Cyclic Electron Flow withoutCompeting CO2 Assimilation in Rice Plant Physiol 176 1509-1518
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) Plastocyanin is indispensable for photosyntheticelectron flow in Arabidopsis thaliana J Biol Chem 278 31286-31289
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M Thofner JF Olsen CE Mottawie MS Burow M Pribil MFeussner I Moller BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 dependent pathways intoSynechocystis sp PCC 6803 Metab Eng 33 1-11
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Google Scholar Author Only Title Only Author and Title
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in functional photosystem II complexes ofcyanobacteria Proc Natl Acad Sci U S A 98 14168-14173
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) Photosynthetic electron partitioning between [FeFe]-hydrogenase and ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S A 108 9396-9401
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of alternative electron flow by flavodiiron proteins inArabidopsis Nat Plants 2 16012
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ (2018) Ectopic expression of SsPETE2 a plastocyanin fromSuaeda salsa improves plant tolerance to oxidative stress Plant Sci 268 1-10
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
35
Jensen PE Leister D (2014) Chloroplast evolution structure and functions F1000Prime 664
Rep 6 40 665
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip 666
functionalization of carbon nanotubes with photosystem I J Am Chem Soc 132 667
2872-2873 668
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and 669
its application in biomimetic solar-to-fuel systems J Plant Physiol 169 1639-1653 670
Kargul J Bubak G Andryianau G (2018) Biophotovoltaic systems based on 671
photosynthetic complexes In Wandelt K (Ed) Encyclopedia of Interfacial 672
Chemistry Surface Science and Electrochemistry vol 7 pp 43-63 673
Kim YS Hara M Ikebukuro K Miyake J Ohkawa H Karube I (1996) Photo-induced 674
activation of cytochrome P450reductase fusion enzyme coupled with spinach 675
chloroplasts Biotechnol Tech 10 717minus720 676
Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic 677
hydrogen production by a hybrid complex of photosystem I and [NiFe]-hydrogenase 678
ACS Nano 3 4055-4061 679
Kromdijk J Glowacka K Leonelli L Gabilly ST Iwai M Niyogi KK Long SP (2016) 680
Improving photosynthesis and crop productivity by accelerating recovery from 681
photoprotection Science 354 857-861 682
Kubota H Sakurai I Katayama K Mizusawa N Ohashi S Kobayashi M Zhang P Aro 683
EM Wada H (2010) Purification and characterization of photosystem I complex 684
from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim 685
Biophys Acta 1797 98-105 686
Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) 687
Redirecting photosynthetic electron flow into light-driven synthesis of alternative 688
products including high-value bioactive natural compounds ACS Synth Biol 3 1-12 689
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) 690
Anchoring a plant cytochrome P450 via PsaM to the thylakoids in Synechococcus sp 691
PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184 692
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front 693
Plant Sci 3 199 694
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of 695
enhancing chloroplast functions Essays Biochem DOI 101042EBC20170010 696
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future 702
by engineering crop photosynthesis and yield potential Cell 161 56-66 703
Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
(2011) Solar hydrogen-producing bionanodevice outperforms natural photosynthesis 709
Proc Natl Acad Sci U S A 108 20988-20991 710
Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
production Biochemistry 49 10264-10266 713
Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
organisms using whole-cell and cell-free systems Appl Biochem Biotechnol 183 715
503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
hydrogenases J Biochem 123 644-649 718
Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
(2016) Fusion of ferredoxin and cytochrome P450 enables direct light-driven 720
biosynthesis ACS Chem Biol 11 1862-1869 721
Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous 722
enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
Y Nishihara H (2010) A photosensing system composed of photosystem I 725
molecular wire gold nanoparticle and double surfactants in water Chem Commun 726
(Camb) 46 2557-2559 727
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
(2009) Surface immobilization of PSI using vitamin K1-like molecular wires for 729
fabrication of a bio-photoelectrode J Nanosci Nanotechnol 9 1722-1726 730
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
37
Molina-Heredia FP Wastl J Navarro JA Bendall DS Hervas M Howe CJ De La Rosa 731
MA (2003) Photosynthesis a new function for an old cytochrome Nature 424 33-34 732
Mullineaux CW Emlyn-Jones D (2005) State transitions an example of acclimation to 733
low-light stress J Exp Bot 56 389-393 734
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J 735
Nanosci Nanotechnol 9 1709-1713 736
Nguyen K Bruce BD (2014) Growing green electricity progress and strategies for use of 737
photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello 742
Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in 748
understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in 750
Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
complex Plant Cell 3 383-395 752
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
S Cazzaniga S Bassi R (2015) Heterologous expression of moss light-harvesting 764
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
38
complex stress-related 1 (LHCSR1) the chlorophyll a-xanthophyll pigment-protein 765
complex catalyzing non-photochemical quenching in Nicotiana sp J Biol Chem 290 766
24340-24354 767
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins 768
Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
phosphatase TAP38 in LHCII dephosphorylation and thylakoid electron flow PLoS 771
Biol 8 e1000288 772
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
natural product biosynthesis Protoplasma 253 1197-1209 774
Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS 775
Lett 581 2768-2775 776
Schiffels J Pinkenburg O Schelden M Aboulnaga el-HA Baumann ME Selmer T 777
(2013) An innovative cloning platform enables large-scale production and maturation 778
of an oxygen-tolerant [NiFe]-hydrogenase from Cupriavidus necator in Escherichia 779
coli PLoS One 8 e6881 780
Schmid VH (2008) Light-harvesting complexes of vascular plants Cell Mol Life Sci 65 781
3619-3639 782
Shi T Bibby TS Jiang L Irwin AJ Falkowski PG (2005) Protein interactions limit the 783
rate of evolution of photosynthetic genes in cyanobacteria Mol Biol Evol 22 2179-784
2189 785
Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS 786
Protein Increases Electron Transport Rates and Biomass Yield Plant Physiol 175 787
134-145 788
Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J 789
(2017) Plasmon-induced absorption of blind chlorophylls in photosynthetic proteins 790
assembled on silver nanowires Nanoscale 9 10475-10486 791
792
Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
Sakai M Fujii M Tohri A Iwai M Inoue Y Yoneyama S Minakata M Enami I 794
(2009) Plugging a molecular wire into photosystem I reconstitution of the 795
photoelectric conversion system on a gold electrode Angew Chem Int Ed Engl 48 796
1585-1587 797
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
39
Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M 798
Iwai M Taguchi S Enami I Inoue Y Yamanoi Y Yonezawa T Mizuno K 799
Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M 800
(2007) Bio-photosensor Cyanobacterial photosystem I coupled with transistor via 801
molecular wire Biochim Biophys Acta 1767 653-659 802
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N 803
(2006) Functional replacement of ferredoxin by a cyanobacterial flavodoxin in 804
tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050 805
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
U S A 104 11495-11500 809
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M 810
Norici A Shotland Y Ohad I Kaplan A (2016) The mechanisms whereby the 811
green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled 812
photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
Photosystem I-catalyst hybrids Curr Opin Chem Biol 25 1-8 815
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium 816
Synechocystis sp PCC 6803 carrying spinach sequences Construction and function 817
Photosynth Res 48 147-162 818
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene 819
replacement in Synechocystis sp PCC 6803 Microb Cell Fact 13 4 820
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
thaliana J Biol Chem 278 31286-31289 826
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M 827
Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
dependent pathways into Synechocystis sp PCC 6803 Metab Eng 33 1-11 830
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
40
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in 831
functional photosystem II complexes of cyanobacteria Proc Natl Acad Sci U S A 98 832
14168-14173 833
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) 834
Photosynthetic electron partitioning between [FeFe]-hydrogenase and 835
ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S 836
A 108 9396-9401 837
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of 838
alternative electron flow by flavodiiron proteins in Arabidopsis Nat Plants 2 16012 839
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ 840
(2018) Ectopic expression of SsPETE2 a plastocyanin from Suaeda salsa improves 841
plant tolerance to oxidative stress Plant Sci 268 1-10 842
843
844
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
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36
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-697
sensitive pathway of cyclic electron flow in plants Front Plant Sci 4 161 698
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) 699
Overexpression of ferredoxin PETF enhances tolerance to heat stress in 700
Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929 701
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future 702
by engineering crop photosynthesis and yield potential Cell 161 56-66 703
Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status 704
Photosynth Res 116 277-293 705
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-706
4148 707
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH 708
(2011) Solar hydrogen-producing bionanodevice outperforms natural photosynthesis 709
Proc Natl Acad Sci U S A 108 20988-20991 710
Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) 711
Wiring an [FeFe]-hydrogenase with photosystem I for light-induced hydrogen 712
production Biochemistry 49 10264-10266 713
Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic 714
organisms using whole-cell and cell-free systems Appl Biochem Biotechnol 183 715
503-519 716
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to 717
hydrogenases J Biochem 123 644-649 718
Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE 719
(2016) Fusion of ferredoxin and cytochrome P450 enables direct light-driven 720
biosynthesis ACS Chem Biol 11 1862-1869 721
Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous 722
enzymes the role of electron carrier proteins Photosynth Res 134 329-342 723
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue 724
Y Nishihara H (2010) A photosensing system composed of photosystem I 725
molecular wire gold nanoparticle and double surfactants in water Chem Commun 726
(Camb) 46 2557-2559 727
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y 728
(2009) Surface immobilization of PSI using vitamin K1-like molecular wires for 729
fabrication of a bio-photoelectrode J Nanosci Nanotechnol 9 1722-1726 730
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37
Molina-Heredia FP Wastl J Navarro JA Bendall DS Hervas M Howe CJ De La Rosa 731
MA (2003) Photosynthesis a new function for an old cytochrome Nature 424 33-34 732
Mullineaux CW Emlyn-Jones D (2005) State transitions an example of acclimation to 733
low-light stress J Exp Bot 56 389-393 734
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J 735
Nanosci Nanotechnol 9 1709-1713 736
Nguyen K Bruce BD (2014) Growing green electricity progress and strategies for use of 737
photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello 742
Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in 748
understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in 750
Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
complex Plant Cell 3 383-395 752
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
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complex stress-related 1 (LHCSR1) the chlorophyll a-xanthophyll pigment-protein 765
complex catalyzing non-photochemical quenching in Nicotiana sp J Biol Chem 290 766
24340-24354 767
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins 768
Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
phosphatase TAP38 in LHCII dephosphorylation and thylakoid electron flow PLoS 771
Biol 8 e1000288 772
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
natural product biosynthesis Protoplasma 253 1197-1209 774
Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS 775
Lett 581 2768-2775 776
Schiffels J Pinkenburg O Schelden M Aboulnaga el-HA Baumann ME Selmer T 777
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coli PLoS One 8 e6881 780
Schmid VH (2008) Light-harvesting complexes of vascular plants Cell Mol Life Sci 65 781
3619-3639 782
Shi T Bibby TS Jiang L Irwin AJ Falkowski PG (2005) Protein interactions limit the 783
rate of evolution of photosynthetic genes in cyanobacteria Mol Biol Evol 22 2179-784
2189 785
Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS 786
Protein Increases Electron Transport Rates and Biomass Yield Plant Physiol 175 787
134-145 788
Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J 789
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assembled on silver nanowires Nanoscale 9 10475-10486 791
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Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
Sakai M Fujii M Tohri A Iwai M Inoue Y Yoneyama S Minakata M Enami I 794
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1585-1587 797
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Iwai M Taguchi S Enami I Inoue Y Yamanoi Y Yonezawa T Mizuno K 799
Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M 800
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Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N 803
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tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050 805
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
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Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M 810
Norici A Shotland Y Ohad I Kaplan A (2016) The mechanisms whereby the 811
green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled 812
photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
Photosystem I-catalyst hybrids Curr Opin Chem Biol 25 1-8 815
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium 816
Synechocystis sp PCC 6803 carrying spinach sequences Construction and function 817
Photosynth Res 48 147-162 818
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Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
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Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
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40
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(2018) Ectopic expression of SsPETE2 a plastocyanin from Suaeda salsa improves 841
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843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous enzymes the role of electron carrierproteins Photosynth Res 134 329-342
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
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Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Molina-Heredia FP Wastl J Navarro JA Bendall DS Hervas M Howe CJ De La Rosa MA (2003) Photosynthesis a new function for anold cytochrome Nature 424 33-34
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Mullineaux CW Emlyn-Jones D (2005) State transitions an example of acclimation to low-light stress J Exp Bot 56 389-393Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J Nanosci Nanotechnol 9 1709-1713Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nguyen K Bruce BD (2014) Growing green electricity progress and strategies for use of photosystem I for sustainable photovoltaicenergy conversion Biochim Biophys Acta 1837 1553-1566 wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu Rev Plant Biol 64 609-635Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello Ramos HdJM King BC Bakowski K Jensen PE (2016)Extending the biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) Redirecting photosynthetic reducing powertoward bioactive natural product synthesis ACS Synth Biol 2 308-315
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in understanding the assembly and repair of photosystem IIAnn Bot 106 1-16
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in Synechocystis 6803 yields a functional hybridphotosystem II reaction center complex Plant Cell 3 383-395
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for hydrogen production from microalgae PlantBiotechnol J 14 1487-99
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein phosphorylation in thylakoids of flowering plants theroles of STN7 STN8 and TAP38 Biochim Biophys Acta 1807 887-896
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G Rappaport F Masiero S Furini A Jahns P Leister D (2009)Mutants overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of plastocyanin in photosyntheticelectron flow and thylakoid redox state Mol Plant 2 236-248
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi S Cazzaniga S Bassi R (2015) Heterologousexpression of moss light-harvesting complex stress-related 1 (LHCSR1) the chlorophyll a-xanthophyll pigment-protein complexcatalyzing non-photochemical quenching in Nicotiana sp J Biol Chem 290 24340-24354
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins Adv Biochem Eng Biotechnol 158 111-136Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein phosphatase TAP38 in LHCII dephosphorylation andthylakoid electron flow PLoS Biol 8 e1000288
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in natural product biosynthesis Protoplasma253 1197-1209
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS Lett 581 2768-2775Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Schiffels J Pinkenburg O Schelden M Aboulnaga el-HA Baumann ME Selmer T (2013) An innovative cloning platform enables large-scale production and maturation of an oxygen-tolerant [NiFe]-hydrogenase from Cupriavidus necator in Escherichia coli PLoS One 8e6881
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Schmid VH (2008) Light-harvesting complexes of vascular plants Cell Mol Life Sci 65 3619-3639Pubmed Author and Title wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Google Scholar Author Only Title Only Author and Title
Shi T Bibby TS Jiang L Irwin AJ Falkowski PG (2005) Protein interactions limit the rate of evolution of photosynthetic genes incyanobacteria Mol Biol Evol 22 2179-2189
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS Protein Increases Electron Transport Ratesand Biomass Yield Plant Physiol 175 134-145
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J (2017) Plasmon-induced absorption of blindchlorophylls in photosynthetic proteins assembled on silver nanowires Nanoscale 9 10475-10486
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T Sakai M Fujii M Tohri A Iwai M Inoue YYoneyama S Minakata M Enami I (2009) Plugging a molecular wire into photosystem I reconstitution of the photoelectric conversionsystem on a gold electrode Angew Chem Int Ed Engl 48 1585-1587
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M Iwai M Taguchi S Enami I Inoue Y Yamanoi YYonezawa T Mizuno K Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M (2007) Bio-photosensorCyanobacterial photosystem I coupled with transistor via molecular wire Biochim Biophys Acta 1767 653-659
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N (2006) Functional replacement of ferredoxin by acyanobacterial flavodoxin in tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR Carrillo N (2007) Enhanced plant tolerance to ironstarvation by functional substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci U S A 104 11495-11500
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M Norici A Shotland Y Ohad I Kaplan A (2016) Themechanisms whereby the green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled photodamage resistanceNew Phytol 210 1229-1243
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from Photosystem I-catalyst hybrids Curr Opin Chem Biol25 1-8
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium Synechocystis sp PCC 6803 carrying spinachsequences Construction and function Photosynth Res 48 147-162
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene replacement in Synechocystis sp PCC 6803Microb Cell Fact 13 4
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron Protein Substitutes for Cyclic Electron Flow withoutCompeting CO2 Assimilation in Rice Plant Physiol 176 1509-1518
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) Plastocyanin is indispensable for photosyntheticelectron flow in Arabidopsis thaliana J Biol Chem 278 31286-31289
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M Thofner JF Olsen CE Mottawie MS Burow M Pribil MFeussner I Moller BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 dependent pathways intoSynechocystis sp PCC 6803 Metab Eng 33 1-11
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Google Scholar Author Only Title Only Author and Title
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in functional photosystem II complexes ofcyanobacteria Proc Natl Acad Sci U S A 98 14168-14173
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) Photosynthetic electron partitioning between [FeFe]-hydrogenase and ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S A 108 9396-9401
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of alternative electron flow by flavodiiron proteins inArabidopsis Nat Plants 2 16012
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ (2018) Ectopic expression of SsPETE2 a plastocyanin fromSuaeda salsa improves plant tolerance to oxidative stress Plant Sci 268 1-10
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
37
Molina-Heredia FP Wastl J Navarro JA Bendall DS Hervas M Howe CJ De La Rosa 731
MA (2003) Photosynthesis a new function for an old cytochrome Nature 424 33-34 732
Mullineaux CW Emlyn-Jones D (2005) State transitions an example of acclimation to 733
low-light stress J Exp Bot 56 389-393 734
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J 735
Nanosci Nanotechnol 9 1709-1713 736
Nguyen K Bruce BD (2014) Growing green electricity progress and strategies for use of 737
photosystem I for sustainable photovoltaic energy conversion Biochim Biophys Acta 738
1837 1553-1566 739
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu 740
Rev Plant Biol 64 609-635 741
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello 742
Ramos HdJM King BC Bakowski K Jensen PE (2016) Extending the 743
biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102 744
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) 745
Redirecting photosynthetic reducing power toward bioactive natural product 746
synthesis ACS Synth Biol 2 308-315 747
Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in 748
understanding the assembly and repair of photosystem II Ann Bot 106 1-16 749
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in 750
Synechocystis 6803 yields a functional hybrid photosystem II reaction center 751
complex Plant Cell 3 383-395 752
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for 753
hydrogen production from microalgae Plant Biotechnol J 14 1487-99 754
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein 755
phosphorylation in thylakoids of flowering plants the roles of STN7 STN8 and 756
TAP38 Biochim Biophys Acta 1807 887-896 757
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G 758
Rappaport F Masiero S Furini A Jahns P Leister D (2009) Mutants 759
overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of 760
plastocyanin in photosynthetic electron flow and thylakoid redox state Mol Plant 2 761
236-248 762
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi 763
S Cazzaniga S Bassi R (2015) Heterologous expression of moss light-harvesting 764
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
38
complex stress-related 1 (LHCSR1) the chlorophyll a-xanthophyll pigment-protein 765
complex catalyzing non-photochemical quenching in Nicotiana sp J Biol Chem 290 766
24340-24354 767
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins 768
Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
phosphatase TAP38 in LHCII dephosphorylation and thylakoid electron flow PLoS 771
Biol 8 e1000288 772
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
natural product biosynthesis Protoplasma 253 1197-1209 774
Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS 775
Lett 581 2768-2775 776
Schiffels J Pinkenburg O Schelden M Aboulnaga el-HA Baumann ME Selmer T 777
(2013) An innovative cloning platform enables large-scale production and maturation 778
of an oxygen-tolerant [NiFe]-hydrogenase from Cupriavidus necator in Escherichia 779
coli PLoS One 8 e6881 780
Schmid VH (2008) Light-harvesting complexes of vascular plants Cell Mol Life Sci 65 781
3619-3639 782
Shi T Bibby TS Jiang L Irwin AJ Falkowski PG (2005) Protein interactions limit the 783
rate of evolution of photosynthetic genes in cyanobacteria Mol Biol Evol 22 2179-784
2189 785
Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS 786
Protein Increases Electron Transport Rates and Biomass Yield Plant Physiol 175 787
134-145 788
Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J 789
(2017) Plasmon-induced absorption of blind chlorophylls in photosynthetic proteins 790
assembled on silver nanowires Nanoscale 9 10475-10486 791
792
Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
Sakai M Fujii M Tohri A Iwai M Inoue Y Yoneyama S Minakata M Enami I 794
(2009) Plugging a molecular wire into photosystem I reconstitution of the 795
photoelectric conversion system on a gold electrode Angew Chem Int Ed Engl 48 796
1585-1587 797
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
39
Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M 798
Iwai M Taguchi S Enami I Inoue Y Yamanoi Y Yonezawa T Mizuno K 799
Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M 800
(2007) Bio-photosensor Cyanobacterial photosystem I coupled with transistor via 801
molecular wire Biochim Biophys Acta 1767 653-659 802
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N 803
(2006) Functional replacement of ferredoxin by a cyanobacterial flavodoxin in 804
tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050 805
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
U S A 104 11495-11500 809
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M 810
Norici A Shotland Y Ohad I Kaplan A (2016) The mechanisms whereby the 811
green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled 812
photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
Photosystem I-catalyst hybrids Curr Opin Chem Biol 25 1-8 815
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium 816
Synechocystis sp PCC 6803 carrying spinach sequences Construction and function 817
Photosynth Res 48 147-162 818
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene 819
replacement in Synechocystis sp PCC 6803 Microb Cell Fact 13 4 820
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
thaliana J Biol Chem 278 31286-31289 826
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M 827
Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
dependent pathways into Synechocystis sp PCC 6803 Metab Eng 33 1-11 830
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
40
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in 831
functional photosystem II complexes of cyanobacteria Proc Natl Acad Sci U S A 98 832
14168-14173 833
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) 834
Photosynthetic electron partitioning between [FeFe]-hydrogenase and 835
ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S 836
A 108 9396-9401 837
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of 838
alternative electron flow by flavodiiron proteins in Arabidopsis Nat Plants 2 16012 839
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ 840
(2018) Ectopic expression of SsPETE2 a plastocyanin from Suaeda salsa improves 841
plant tolerance to oxidative stress Plant Sci 268 1-10 842
843
844
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
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38
complex stress-related 1 (LHCSR1) the chlorophyll a-xanthophyll pigment-protein 765
complex catalyzing non-photochemical quenching in Nicotiana sp J Biol Chem 290 766
24340-24354 767
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins 768
Adv Biochem Eng Biotechnol 158 111-136 769
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein 770
phosphatase TAP38 in LHCII dephosphorylation and thylakoid electron flow PLoS 771
Biol 8 e1000288 772
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in 773
natural product biosynthesis Protoplasma 253 1197-1209 774
Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS 775
Lett 581 2768-2775 776
Schiffels J Pinkenburg O Schelden M Aboulnaga el-HA Baumann ME Selmer T 777
(2013) An innovative cloning platform enables large-scale production and maturation 778
of an oxygen-tolerant [NiFe]-hydrogenase from Cupriavidus necator in Escherichia 779
coli PLoS One 8 e6881 780
Schmid VH (2008) Light-harvesting complexes of vascular plants Cell Mol Life Sci 65 781
3619-3639 782
Shi T Bibby TS Jiang L Irwin AJ Falkowski PG (2005) Protein interactions limit the 783
rate of evolution of photosynthetic genes in cyanobacteria Mol Biol Evol 22 2179-784
2189 785
Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS 786
Protein Increases Electron Transport Rates and Biomass Yield Plant Physiol 175 787
134-145 788
Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J 789
(2017) Plasmon-induced absorption of blind chlorophylls in photosynthetic proteins 790
assembled on silver nanowires Nanoscale 9 10475-10486 791
792
Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T 793
Sakai M Fujii M Tohri A Iwai M Inoue Y Yoneyama S Minakata M Enami I 794
(2009) Plugging a molecular wire into photosystem I reconstitution of the 795
photoelectric conversion system on a gold electrode Angew Chem Int Ed Engl 48 796
1585-1587 797
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
39
Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M 798
Iwai M Taguchi S Enami I Inoue Y Yamanoi Y Yonezawa T Mizuno K 799
Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M 800
(2007) Bio-photosensor Cyanobacterial photosystem I coupled with transistor via 801
molecular wire Biochim Biophys Acta 1767 653-659 802
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N 803
(2006) Functional replacement of ferredoxin by a cyanobacterial flavodoxin in 804
tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050 805
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
U S A 104 11495-11500 809
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M 810
Norici A Shotland Y Ohad I Kaplan A (2016) The mechanisms whereby the 811
green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled 812
photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
Photosystem I-catalyst hybrids Curr Opin Chem Biol 25 1-8 815
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium 816
Synechocystis sp PCC 6803 carrying spinach sequences Construction and function 817
Photosynth Res 48 147-162 818
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene 819
replacement in Synechocystis sp PCC 6803 Microb Cell Fact 13 4 820
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
thaliana J Biol Chem 278 31286-31289 826
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M 827
Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
dependent pathways into Synechocystis sp PCC 6803 Metab Eng 33 1-11 830
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40
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in 831
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14168-14173 833
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) 834
Photosynthetic electron partitioning between [FeFe]-hydrogenase and 835
ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S 836
A 108 9396-9401 837
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of 838
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(2018) Ectopic expression of SsPETE2 a plastocyanin from Suaeda salsa improves 841
plant tolerance to oxidative stress Plant Sci 268 1-10 842
843
844
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in natural product biosynthesis Protoplasma253 1197-1209
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Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS Lett 581 2768-2775Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Schiffels J Pinkenburg O Schelden M Aboulnaga el-HA Baumann ME Selmer T (2013) An innovative cloning platform enables large-scale production and maturation of an oxygen-tolerant [NiFe]-hydrogenase from Cupriavidus necator in Escherichia coli PLoS One 8e6881
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Schmid VH (2008) Light-harvesting complexes of vascular plants Cell Mol Life Sci 65 3619-3639Pubmed Author and Title wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
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Shi T Bibby TS Jiang L Irwin AJ Falkowski PG (2005) Protein interactions limit the rate of evolution of photosynthetic genes incyanobacteria Mol Biol Evol 22 2179-2189
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Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS Protein Increases Electron Transport Ratesand Biomass Yield Plant Physiol 175 134-145
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Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J (2017) Plasmon-induced absorption of blindchlorophylls in photosynthetic proteins assembled on silver nanowires Nanoscale 9 10475-10486
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Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T Sakai M Fujii M Tohri A Iwai M Inoue YYoneyama S Minakata M Enami I (2009) Plugging a molecular wire into photosystem I reconstitution of the photoelectric conversionsystem on a gold electrode Angew Chem Int Ed Engl 48 1585-1587
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Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M Iwai M Taguchi S Enami I Inoue Y Yamanoi YYonezawa T Mizuno K Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M (2007) Bio-photosensorCyanobacterial photosystem I coupled with transistor via molecular wire Biochim Biophys Acta 1767 653-659
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Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N (2006) Functional replacement of ferredoxin by acyanobacterial flavodoxin in tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050
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Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR Carrillo N (2007) Enhanced plant tolerance to ironstarvation by functional substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci U S A 104 11495-11500
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Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M Norici A Shotland Y Ohad I Kaplan A (2016) Themechanisms whereby the green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled photodamage resistanceNew Phytol 210 1229-1243
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Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from Photosystem I-catalyst hybrids Curr Opin Chem Biol25 1-8
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Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium Synechocystis sp PCC 6803 carrying spinachsequences Construction and function Photosynth Res 48 147-162
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Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene replacement in Synechocystis sp PCC 6803Microb Cell Fact 13 4
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Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron Protein Substitutes for Cyclic Electron Flow withoutCompeting CO2 Assimilation in Rice Plant Physiol 176 1509-1518
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Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) Plastocyanin is indispensable for photosyntheticelectron flow in Arabidopsis thaliana J Biol Chem 278 31286-31289
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Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M Thofner JF Olsen CE Mottawie MS Burow M Pribil MFeussner I Moller BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 dependent pathways intoSynechocystis sp PCC 6803 Metab Eng 33 1-11
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Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in functional photosystem II complexes ofcyanobacteria Proc Natl Acad Sci U S A 98 14168-14173
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Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) Photosynthetic electron partitioning between [FeFe]-hydrogenase and ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S A 108 9396-9401
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Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of alternative electron flow by flavodiiron proteins inArabidopsis Nat Plants 2 16012
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Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ (2018) Ectopic expression of SsPETE2 a plastocyanin fromSuaeda salsa improves plant tolerance to oxidative stress Plant Sci 268 1-10
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wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
39
Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M 798
Iwai M Taguchi S Enami I Inoue Y Yamanoi Y Yonezawa T Mizuno K 799
Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M 800
(2007) Bio-photosensor Cyanobacterial photosystem I coupled with transistor via 801
molecular wire Biochim Biophys Acta 1767 653-659 802
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N 803
(2006) Functional replacement of ferredoxin by a cyanobacterial flavodoxin in 804
tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050 805
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR 806
Carrillo N (2007) Enhanced plant tolerance to iron starvation by functional 807
substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci 808
U S A 104 11495-11500 809
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M 810
Norici A Shotland Y Ohad I Kaplan A (2016) The mechanisms whereby the 811
green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled 812
photodamage resistance New Phytol 210 1229-1243 813
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from 814
Photosystem I-catalyst hybrids Curr Opin Chem Biol 25 1-8 815
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium 816
Synechocystis sp PCC 6803 carrying spinach sequences Construction and function 817
Photosynth Res 48 147-162 818
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene 819
replacement in Synechocystis sp PCC 6803 Microb Cell Fact 13 4 820
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron 821
Protein Substitutes for Cyclic Electron Flow without Competing CO2 Assimilation in 822
Rice Plant Physiol 176 1509-1518 823
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) 824
Plastocyanin is indispensable for photosynthetic electron flow in Arabidopsis 825
thaliana J Biol Chem 278 31286-31289 826
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M 827
Thofner JF Olsen CE Mottawie MS Burow M Pribil M Feussner I Moller 828
BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 829
dependent pathways into Synechocystis sp PCC 6803 Metab Eng 33 1-11 830
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
40
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in 831
functional photosystem II complexes of cyanobacteria Proc Natl Acad Sci U S A 98 832
14168-14173 833
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) 834
Photosynthetic electron partitioning between [FeFe]-hydrogenase and 835
ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S 836
A 108 9396-9401 837
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of 838
alternative electron flow by flavodiiron proteins in Arabidopsis Nat Plants 2 16012 839
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ 840
(2018) Ectopic expression of SsPETE2 a plastocyanin from Suaeda salsa improves 841
plant tolerance to oxidative stress Plant Sci 268 1-10 842
843
844
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
40
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in 831
functional photosystem II complexes of cyanobacteria Proc Natl Acad Sci U S A 98 832
14168-14173 833
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) 834
Photosynthetic electron partitioning between [FeFe]-hydrogenase and 835
ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S 836
A 108 9396-9401 837
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of 838
alternative electron flow by flavodiiron proteins in Arabidopsis Nat Plants 2 16012 839
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ 840
(2018) Ectopic expression of SsPETE2 a plastocyanin from Suaeda salsa improves 841
plant tolerance to oxidative stress Plant Sci 268 1-10 842
843
844
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wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in functional photosystem II complexes ofcyanobacteria Proc Natl Acad Sci U S A 98 14168-14173
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Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) Photosynthetic electron partitioning between [FeFe]-hydrogenase and ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S A 108 9396-9401
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T Sakai M Fujii M Tohri A Iwai M Inoue YYoneyama S Minakata M Enami I (2009) Plugging a molecular wire into photosystem I reconstitution of the photoelectric conversionsystem on a gold electrode Angew Chem Int Ed Engl 48 1585-1587
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Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N (2006) Functional replacement of ferredoxin by acyanobacterial flavodoxin in tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050
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Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR Carrillo N (2007) Enhanced plant tolerance to ironstarvation by functional substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci U S A 104 11495-11500
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Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M Norici A Shotland Y Ohad I Kaplan A (2016) Themechanisms whereby the green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled photodamage resistanceNew Phytol 210 1229-1243
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Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from Photosystem I-catalyst hybrids Curr Opin Chem Biol25 1-8
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Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium Synechocystis sp PCC 6803 carrying spinachsequences Construction and function Photosynth Res 48 147-162
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Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene replacement in Synechocystis sp PCC 6803Microb Cell Fact 13 4
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Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) Plastocyanin is indispensable for photosyntheticelectron flow in Arabidopsis thaliana J Biol Chem 278 31286-31289
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Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M Thofner JF Olsen CE Mottawie MS Burow M Pribil MFeussner I Moller BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 dependent pathways intoSynechocystis sp PCC 6803 Metab Eng 33 1-11
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Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) Photosynthetic electron partitioning between [FeFe]-hydrogenase and ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S A 108 9396-9401
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
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ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
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OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
ADVANCES
bull Individual photosynthetic proteins can be exchanged between species but the replacement of proteins embedded in photosynthetic multiprotein complexes is complicated due to their ldquofrozen metabolic staterdquo
bull Entire multiprotein (sub)complexes can be exchanged via ldquosynthetic photosynthetic modulesrdquo that contain a sufficient number of proteins to overcome the ldquofrozen metabolic staterdquo as well as all genetic elements and auxiliary factors for their efficient expression biogenesis and function
bull Overexpression of photosynthetic proteins that are not organized in complexes can enhance photosynthetic efficiency and growth
bull Photosynthesis can be coupled in vivo to previously unrelated enzymes and pathways to enable light-driven production of valuable compounds
bull Photosystem I is a highly efficient and robust nano-photochemical machine that can be technically applied in vitro for the production of hydrogen or electricity
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
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BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
OUTSTANDING QUESTIONS
bull Can photosynthesis be enhanced by combining ldquosynthetic photosynthetic modulesrdquo from different species
bull Can the ldquofrozen metabolic accidentsrdquo be substituted by more efficient proteins via re-designing ldquosynthetic photosynthetic modulesrdquo
bull Can a fundamentally different type of photosynthesis be realized
bull Can bio-bio and bio-nano hybrids be generated efficiently and provide valuable substances and energy safely and economically
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
BOX 1 The Conserved Basic Principle of
Photosynthesis
Cyanobacteria and plants possess two photosystems photosystems I (PSI) and II (PSII see Fig 1 and Fig Box 1) which respond optimally to light of different wavelengths Upon absorption of light PSII transfers electrons to plastoquinone (an electron carrier located in the thylakoid membrane) and these electrons are replaced by electrons obtained through the oxidation of water which produces oxygen Plastoquinone transfers its electrons to PSI via the cytochrome b6f complex (Cyt b6f) and a soluble electron carrier in the thylakoid lumen (plastocyanin or cytochrome c6) Upon an additional light absorption step electrons are transferred from the reaction center of PSI (P700 chlorophyll a) via a number of cofactors (P700 rarr A0 rarr A1 rarr FX rarr FA rarr FB with A0 being a chlorophyll a molecule A1 a phylloquinone molecule and FA FB and FX being iron-sulfur clusters) to soluble electron carriers (ferredoxin or flavodoxin) on the other side of the thylakoid membrane and from there to NADP+ to generate NADPH Protons accumulate in the thylakoid lumen during the oxidation of water and electron transfer through Cyt b6f The energy released by the passage of protons back across the thylakoid membrane is harnessed by the ATPase complex to produce ATP This process involving both photosystems is known as linear electron flow (see Fig Box 1) Cyclic electron flow is an alternative process that involves the movement of electrons around PSI only and drives the formation of ATP without the production of NADPH The basic structure of the multiprotein complexes involved in linear or cyclic electron flow is conserved between cyanobacteria and plants but both cyanobacteria and plants contain a number of specific subunits (see Fig 1)
Figure Box 1 Scheme of linear (A) and cyclic electron flow (B)
Components specific to cyanobacteria or plants are highlighted in blue and green respectively Conserved components are shown in gray AA antimycin A NDH NAD(P)H dehydrogenase complex OEC oxygen-evolving complex otherwise the same abbreviations as in Fig 1 are used
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
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BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
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BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
BOX 2 Where Photosynthesis Varies Most
Antennas Pigments and Regulation
The photosynthetic machineries of cyanobacteria and plants differ markedly in their light-harvesting pigment-protein complexes and their regulation Cyanobacteria harvest light with phycobilisomes giant soluble complexes associated with the inner membrane surface that contain phycobiliproteins Plants employ intramembranous antennae the light-harvesting complexes I (LHCI) and II (LHCII) Additional Lhc proteins (CP24 CP26 CP29 and PsbS) are present in the PSII of plants but not in cyanobacteria (see Fig 1)
In addition the pigment composition-- particularly that of the light-harvesting systems--differs between cyanobacteria and plants In both cyanobacteria and plants PSI and PSII (without CP24 CP26 and CP29) bind chlorophyll (Chl) a and β-carotene molecules but phycobilisomes contain linear tetrapyrroles (bilins) as pigments LHCI contains Chl a and b and the carotenoids violaxanthin lutein and β-carotene In LHCII and the inner antenna proteins CP24 CP26 and CP29 neoxanthin substitute for β-carotene Both cyanobacteria and plants utilize Chl a and β-carotene but plants use Chl b and the carotenoids lutein violaxanthin and neoxanthin although cyanobacteria can synthesize their precursors (zeaxanthin and lycopene)
Photosynthetic electron flow is regulated at various levels of which three are highlighted here (1) Adjustment of the ratio of linear to cyclic electron flow (CEF) controls the output of photosynthesis in terms of the ATPNADPH ratio One major CEF route is antimycin A-sensitive and involves the PGRL1PGR5 complex in plants cyanobacteria lack this complex (Leister and Shikanai 2013 see Fig Box 1 and Fig 1) (2) In plants excess energy absorbed during exposure to high light levels can be dissipated by LHCII via a mechanism known as the energy-dependent component (qE) of non-photochemical quenching (NPQ) which involves the xanthophyll cycle (with enzymes like violaxanthin de-epoxidase and zeaxanthin epoxidase) and the PSII subunit PsbS and is activated by a decrease in pH in the thylakoid lumen (Holt et al 2004 de Bianchi et al 2010) (3) Reversible relocation of phycobilisomes (Mullineaux and Emlyn-Jones 2005) or LHCII (Rochaix 2007) from PSII to PSI depending on light conditions is used to balance the distribution of excitation energy between the photosystems and is referred to as ldquostate transitionsrdquo In plants but not in cyanobacteria the process depends on reversible protein phosphorylation (Pesaresi et al 2011)
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
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- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
BOX 3 Overexpression of Photosynthetic
Proteins Can Enhance Photosynthesis
Boosting the efficiency of the photosynthetic light reactions by synthetic biology is a long-term project whereas optimizing the process under agriculturally relevant conditions is already feasible by much simpler means A prominent example of this is represented by the parallel overexpression of the three photoprotective proteins PsbS violaxanthin de-epoxidase (VDE) and zeaxanthin epoxidase (ZE) in tobacco (Kromdijk et al 2016) This PsbS-VDE-ZE overexpressor line displayed an accelerated photoprotective response to natural shading events resulting in increased plant dry matter productivity under field conditions Moreover tobacco plants overexpressing PsbS alone showed less stomatal opening in response to light decreasing water loss under field conditions (Glowacka et al 2018)
Also overexpression of soluble electron transporters can enhance photosynthesis These proteins can be easily overexpressed because their actions are not dependent on strict stoichiometries For instance overexpression of both the endogenous thylakoid lumen protein plastocyanin and the heterologous red algal cytochrome c6 protein can enhance growth in plants (Chida et al 2007 Pesaresi et al 2009 Zhou et al 2018) and a similar effect is seen for cyanobacterial flavodoxin and endogenous plant
ferredoxins (Tognetti et al 2006 Tognetti et al 2007 Blanco et al 2011 Lin et al 2013 Chang et al 2017)
A third instance for enhancing photosynthesis is provided by overexpression of the tobacco Rieske protein (PETC) in Arabidopsis (Simkin et al 2017) resulting in enhanced levels of other Cyt b6f complex subunits together with enhanced plant growth and dry weight production This implies that PETC may be rate-limiting for the accumulation of the Cyt b6f complex and that the additional tobacco PETC copies can escape the limitations of the ldquofrozen metabolic staterdquo due to the high similarity with their Arabidopsis counterparts
These instances of enhancing photosynthesis by ldquosimplerdquo overexpression of (endogenous) photosynthetic proteins raise the question of why evolution has not already produced such plants in nature by positively selecting mutations in regulatory regions that increase the expression of such genes The most plausible explanation is that under natural conditions overexpression of these genes involves a trade-off This hypothetical trade-off should be related to plant fitness in terms of reproductive efficiency which might not necessarily interfere with crop yield under non-natural (agricultural) conditions
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
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Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) Redirecting photosynthetic electron flow into light-driven synthesis of alternative products including high-value bioactive natural compounds ACS Synth Biol 3 1-12
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Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front Plant Sci 3 199
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of enhancing chloroplast functions EssaysBiochem DOI 101042EBC20170010
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Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-sensitive pathway of cyclic electron flow in plantsFront Plant Sci 4 161 wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
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- Parsed Citations
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- Parsed Citations
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Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue Y Nishihara H (2010) A photosensing systemcomposed of photosystem I molecular wire gold nanoparticle and double surfactants in water Chem Commun (Camb) 46 2557-2559
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Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y (2009) Surface immobilization of PSI using vitaminK1-like molecular wires for fabrication of a bio-photoelectrode J Nanosci Nanotechnol 9 1722-1726
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Molina-Heredia FP Wastl J Navarro JA Bendall DS Hervas M Howe CJ De La Rosa MA (2003) Photosynthesis a new function for anold cytochrome Nature 424 33-34
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Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J Nanosci Nanotechnol 9 1709-1713Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nguyen K Bruce BD (2014) Growing green electricity progress and strategies for use of photosystem I for sustainable photovoltaicenergy conversion Biochim Biophys Acta 1837 1553-1566 wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu Rev Plant Biol 64 609-635Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello Ramos HdJM King BC Bakowski K Jensen PE (2016)Extending the biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) Redirecting photosynthetic reducing powertoward bioactive natural product synthesis ACS Synth Biol 2 308-315
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in understanding the assembly and repair of photosystem IIAnn Bot 106 1-16
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in Synechocystis 6803 yields a functional hybridphotosystem II reaction center complex Plant Cell 3 383-395
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for hydrogen production from microalgae PlantBiotechnol J 14 1487-99
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein phosphorylation in thylakoids of flowering plants theroles of STN7 STN8 and TAP38 Biochim Biophys Acta 1807 887-896
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G Rappaport F Masiero S Furini A Jahns P Leister D (2009)Mutants overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of plastocyanin in photosyntheticelectron flow and thylakoid redox state Mol Plant 2 236-248
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi S Cazzaniga S Bassi R (2015) Heterologousexpression of moss light-harvesting complex stress-related 1 (LHCSR1) the chlorophyll a-xanthophyll pigment-protein complexcatalyzing non-photochemical quenching in Nicotiana sp J Biol Chem 290 24340-24354
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins Adv Biochem Eng Biotechnol 158 111-136Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein phosphatase TAP38 in LHCII dephosphorylation andthylakoid electron flow PLoS Biol 8 e1000288
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in natural product biosynthesis Protoplasma253 1197-1209
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS Lett 581 2768-2775Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Schiffels J Pinkenburg O Schelden M Aboulnaga el-HA Baumann ME Selmer T (2013) An innovative cloning platform enables large-scale production and maturation of an oxygen-tolerant [NiFe]-hydrogenase from Cupriavidus necator in Escherichia coli PLoS One 8e6881
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Schmid VH (2008) Light-harvesting complexes of vascular plants Cell Mol Life Sci 65 3619-3639Pubmed Author and Title wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Google Scholar Author Only Title Only Author and Title
Shi T Bibby TS Jiang L Irwin AJ Falkowski PG (2005) Protein interactions limit the rate of evolution of photosynthetic genes incyanobacteria Mol Biol Evol 22 2179-2189
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS Protein Increases Electron Transport Ratesand Biomass Yield Plant Physiol 175 134-145
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J (2017) Plasmon-induced absorption of blindchlorophylls in photosynthetic proteins assembled on silver nanowires Nanoscale 9 10475-10486
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T Sakai M Fujii M Tohri A Iwai M Inoue YYoneyama S Minakata M Enami I (2009) Plugging a molecular wire into photosystem I reconstitution of the photoelectric conversionsystem on a gold electrode Angew Chem Int Ed Engl 48 1585-1587
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M Iwai M Taguchi S Enami I Inoue Y Yamanoi YYonezawa T Mizuno K Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M (2007) Bio-photosensorCyanobacterial photosystem I coupled with transistor via molecular wire Biochim Biophys Acta 1767 653-659
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N (2006) Functional replacement of ferredoxin by acyanobacterial flavodoxin in tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR Carrillo N (2007) Enhanced plant tolerance to ironstarvation by functional substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci U S A 104 11495-11500
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M Norici A Shotland Y Ohad I Kaplan A (2016) Themechanisms whereby the green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled photodamage resistanceNew Phytol 210 1229-1243
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from Photosystem I-catalyst hybrids Curr Opin Chem Biol25 1-8
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium Synechocystis sp PCC 6803 carrying spinachsequences Construction and function Photosynth Res 48 147-162
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene replacement in Synechocystis sp PCC 6803Microb Cell Fact 13 4
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron Protein Substitutes for Cyclic Electron Flow withoutCompeting CO2 Assimilation in Rice Plant Physiol 176 1509-1518
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) Plastocyanin is indispensable for photosyntheticelectron flow in Arabidopsis thaliana J Biol Chem 278 31286-31289
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M Thofner JF Olsen CE Mottawie MS Burow M Pribil MFeussner I Moller BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 dependent pathways intoSynechocystis sp PCC 6803 Metab Eng 33 1-11
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Google Scholar Author Only Title Only Author and Title
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in functional photosystem II complexes ofcyanobacteria Proc Natl Acad Sci U S A 98 14168-14173
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) Photosynthetic electron partitioning between [FeFe]-hydrogenase and ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S A 108 9396-9401
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of alternative electron flow by flavodiiron proteins inArabidopsis Nat Plants 2 16012
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ (2018) Ectopic expression of SsPETE2 a plastocyanin fromSuaeda salsa improves plant tolerance to oxidative stress Plant Sci 268 1-10
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
- Parsed Citations
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- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
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Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-sensitive pathway of cyclic electron flow in plantsFront Plant Sci 4 161 wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
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Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y (2009) Surface immobilization of PSI using vitaminK1-like molecular wires for fabrication of a bio-photoelectrode J Nanosci Nanotechnol 9 1722-1726
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Mullineaux CW Emlyn-Jones D (2005) State transitions an example of acclimation to low-light stress J Exp Bot 56 389-393Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
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Nguyen K Bruce BD (2014) Growing green electricity progress and strategies for use of photosystem I for sustainable photovoltaicenergy conversion Biochim Biophys Acta 1837 1553-1566 wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
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Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu Rev Plant Biol 64 609-635Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello Ramos HdJM King BC Bakowski K Jensen PE (2016)Extending the biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102
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Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) Redirecting photosynthetic reducing powertoward bioactive natural product synthesis ACS Synth Biol 2 308-315
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in understanding the assembly and repair of photosystem IIAnn Bot 106 1-16
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in Synechocystis 6803 yields a functional hybridphotosystem II reaction center complex Plant Cell 3 383-395
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for hydrogen production from microalgae PlantBiotechnol J 14 1487-99
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein phosphorylation in thylakoids of flowering plants theroles of STN7 STN8 and TAP38 Biochim Biophys Acta 1807 887-896
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G Rappaport F Masiero S Furini A Jahns P Leister D (2009)Mutants overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of plastocyanin in photosyntheticelectron flow and thylakoid redox state Mol Plant 2 236-248
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi S Cazzaniga S Bassi R (2015) Heterologousexpression of moss light-harvesting complex stress-related 1 (LHCSR1) the chlorophyll a-xanthophyll pigment-protein complexcatalyzing non-photochemical quenching in Nicotiana sp J Biol Chem 290 24340-24354
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins Adv Biochem Eng Biotechnol 158 111-136Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein phosphatase TAP38 in LHCII dephosphorylation andthylakoid electron flow PLoS Biol 8 e1000288
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in natural product biosynthesis Protoplasma253 1197-1209
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS Lett 581 2768-2775Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Schiffels J Pinkenburg O Schelden M Aboulnaga el-HA Baumann ME Selmer T (2013) An innovative cloning platform enables large-scale production and maturation of an oxygen-tolerant [NiFe]-hydrogenase from Cupriavidus necator in Escherichia coli PLoS One 8e6881
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Schmid VH (2008) Light-harvesting complexes of vascular plants Cell Mol Life Sci 65 3619-3639Pubmed Author and Title wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Google Scholar Author Only Title Only Author and Title
Shi T Bibby TS Jiang L Irwin AJ Falkowski PG (2005) Protein interactions limit the rate of evolution of photosynthetic genes incyanobacteria Mol Biol Evol 22 2179-2189
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS Protein Increases Electron Transport Ratesand Biomass Yield Plant Physiol 175 134-145
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J (2017) Plasmon-induced absorption of blindchlorophylls in photosynthetic proteins assembled on silver nanowires Nanoscale 9 10475-10486
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T Sakai M Fujii M Tohri A Iwai M Inoue YYoneyama S Minakata M Enami I (2009) Plugging a molecular wire into photosystem I reconstitution of the photoelectric conversionsystem on a gold electrode Angew Chem Int Ed Engl 48 1585-1587
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M Iwai M Taguchi S Enami I Inoue Y Yamanoi YYonezawa T Mizuno K Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M (2007) Bio-photosensorCyanobacterial photosystem I coupled with transistor via molecular wire Biochim Biophys Acta 1767 653-659
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N (2006) Functional replacement of ferredoxin by acyanobacterial flavodoxin in tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR Carrillo N (2007) Enhanced plant tolerance to ironstarvation by functional substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci U S A 104 11495-11500
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M Norici A Shotland Y Ohad I Kaplan A (2016) Themechanisms whereby the green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled photodamage resistanceNew Phytol 210 1229-1243
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from Photosystem I-catalyst hybrids Curr Opin Chem Biol25 1-8
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium Synechocystis sp PCC 6803 carrying spinachsequences Construction and function Photosynth Res 48 147-162
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene replacement in Synechocystis sp PCC 6803Microb Cell Fact 13 4
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron Protein Substitutes for Cyclic Electron Flow withoutCompeting CO2 Assimilation in Rice Plant Physiol 176 1509-1518
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) Plastocyanin is indispensable for photosyntheticelectron flow in Arabidopsis thaliana J Biol Chem 278 31286-31289
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M Thofner JF Olsen CE Mottawie MS Burow M Pribil MFeussner I Moller BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 dependent pathways intoSynechocystis sp PCC 6803 Metab Eng 33 1-11
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Google Scholar Author Only Title Only Author and Title
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in functional photosystem II complexes ofcyanobacteria Proc Natl Acad Sci U S A 98 14168-14173
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) Photosynthetic electron partitioning between [FeFe]-hydrogenase and ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S A 108 9396-9401
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of alternative electron flow by flavodiiron proteins inArabidopsis Nat Plants 2 16012
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ (2018) Ectopic expression of SsPETE2 a plastocyanin fromSuaeda salsa improves plant tolerance to oxidative stress Plant Sci 268 1-10
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
Ihara M Nakamoto H Kamachi T Okura I Maeda M (2006b) Photoinduced hydrogen production by direct electron transfer fromphotosystem I cross-linked with cytochrome c3 to [NiFe]-hydrogenase Photochem Photobiol 82 1677-1685Janna Olmos JD Kargul J(2015) A quest for the artificial leaf Int J Biochem Cell Biol 66 37-44
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Janna Olmos JD Becquet P Gront D Sar J Dąbrowski A Gawlik G Teodorczyk M Pawlak D Kargul J (2017) Biofunctionalisation of p-doped silicon with cytochrome c553 minimises charge recombination and enhances photovoltaic performance of the all-solid-statephotosystem I-based biophotoelectrode RSC Adv 7 47854-47866
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Jensen K Jensen PE Moller BL (2011) Light-driven cytochrome P450 hydroxylations ACS Chem Biol 6 533-539Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Jensen PE Leister D (2014) Chloroplast evolution structure and functions F1000Prime Rep 6 40Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Kaniber SM Brandstetter M Simmel FC Carmeli I Holleitner AW (2010) On-chip functionalization of carbon nanotubes withphotosystem I J Am Chem Soc 132 2872-2873
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Kargul J Janna Olmos JD Krupnik T (2012) Structure and function of photosystem I and its application in biomimetic solar-to-fuelsystems J Plant Physiol 169 1639-1653
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Kargul J Bubak G Andryianau G (2018) Biophotovoltaic systems based on photosynthetic complexes In Wandelt K (Ed)Encyclopedia of Interfacial Chemistry Surface Science and Electrochemistry vol 7 pp 43-63
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Kim YS Hara M Ikebukuro K Miyake J Ohkawa H Karube I (1996) Photo-induced activation of cytochrome P450reductase fusionenzyme coupled with spinach chloroplasts Biotechnol Tech 10 717minus720
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Krassen H Schwarze A Friedrich B Ataka K Lenz O Heberle J (2009) Photosynthetic hydrogen production by a hybrid complex ofphotosystem I and [NiFe]-hydrogenase ACS Nano 3 4055-4061
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Kromdijk J Glowacka K Leonelli L Gabilly ST Iwai M Niyogi KK Long SP (2016) Improving photosynthesis and crop productivity byaccelerating recovery from photoprotection Science 354 857-861
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Kubota H Sakurai I Katayama K Mizusawa N Ohashi S Kobayashi M Zhang P Aro EM Wada H (2010) Purification andcharacterization of photosystem I complex from Synechocystis sp PCC 6803 by expressing histidine-tagged subunits Biochim BiophysActa 1797 98-105
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Lassen LM Nielsen AZ Ziersen B Gnanasekaran T Moller BL Jensen PE (2014a) Redirecting photosynthetic electron flow into light-driven synthesis of alternative products including high-value bioactive natural compounds ACS Synth Biol 3 1-12
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Lassen LM Nielsen AZ Olsen CE Bialek W Jensen K Moller BL Jensen PE (2014b) Anchoring a plant cytochrome P450 via PsaM tothe thylakoids in Synechococcus sp PCC 7002 evidence for light-driven biosynthesis PLoS One 9 e102184
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Leister D (2012) How can the light reactions of photosynthesis be improved in plants Front Plant Sci 3 199
Leister D (2017) Experimental evolution in photoautotrophic microorganisms as a means of enhancing chloroplast functions EssaysBiochem DOI 101042EBC20170010
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Leister D Shikanai T (2013) Complexities and protein complexes in the antimycin A-sensitive pathway of cyclic electron flow in plantsFront Plant Sci 4 161 wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) Overexpression of ferredoxin PETF enhances tolerance toheat stress in Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future by engineering crop photosynthesis and yieldpotential Cell 161 56-66
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status Photosynth Res 116 277-293Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-4148Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH (2011) Solar hydrogen-producing bionanodeviceoutperforms natural photosynthesis Proc Natl Acad Sci U S A 108 20988-20991
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) Wiring an [FeFe]-hydrogenase with photosystem Ifor light-induced hydrogen production Biochemistry 49 10264-10266
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic organisms using whole-cell and cell-free systemsAppl Biochem Biotechnol 183 503-519
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to hydrogenases J Biochem 123 644-649Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE (2016) Fusion of ferredoxin and cytochrome P450enables direct light-driven biosynthesis ACS Chem Biol 11 1862-1869
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous enzymes the role of electron carrierproteins Photosynth Res 134 329-342
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue Y Nishihara H (2010) A photosensing systemcomposed of photosystem I molecular wire gold nanoparticle and double surfactants in water Chem Commun (Camb) 46 2557-2559
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y (2009) Surface immobilization of PSI using vitaminK1-like molecular wires for fabrication of a bio-photoelectrode J Nanosci Nanotechnol 9 1722-1726
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Molina-Heredia FP Wastl J Navarro JA Bendall DS Hervas M Howe CJ De La Rosa MA (2003) Photosynthesis a new function for anold cytochrome Nature 424 33-34
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Mullineaux CW Emlyn-Jones D (2005) State transitions an example of acclimation to low-light stress J Exp Bot 56 389-393Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J Nanosci Nanotechnol 9 1709-1713Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nguyen K Bruce BD (2014) Growing green electricity progress and strategies for use of photosystem I for sustainable photovoltaicenergy conversion Biochim Biophys Acta 1837 1553-1566 wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu Rev Plant Biol 64 609-635Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello Ramos HdJM King BC Bakowski K Jensen PE (2016)Extending the biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) Redirecting photosynthetic reducing powertoward bioactive natural product synthesis ACS Synth Biol 2 308-315
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in understanding the assembly and repair of photosystem IIAnn Bot 106 1-16
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in Synechocystis 6803 yields a functional hybridphotosystem II reaction center complex Plant Cell 3 383-395
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for hydrogen production from microalgae PlantBiotechnol J 14 1487-99
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein phosphorylation in thylakoids of flowering plants theroles of STN7 STN8 and TAP38 Biochim Biophys Acta 1807 887-896
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G Rappaport F Masiero S Furini A Jahns P Leister D (2009)Mutants overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of plastocyanin in photosyntheticelectron flow and thylakoid redox state Mol Plant 2 236-248
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi S Cazzaniga S Bassi R (2015) Heterologousexpression of moss light-harvesting complex stress-related 1 (LHCSR1) the chlorophyll a-xanthophyll pigment-protein complexcatalyzing non-photochemical quenching in Nicotiana sp J Biol Chem 290 24340-24354
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins Adv Biochem Eng Biotechnol 158 111-136Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein phosphatase TAP38 in LHCII dephosphorylation andthylakoid electron flow PLoS Biol 8 e1000288
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in natural product biosynthesis Protoplasma253 1197-1209
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS Lett 581 2768-2775Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Schiffels J Pinkenburg O Schelden M Aboulnaga el-HA Baumann ME Selmer T (2013) An innovative cloning platform enables large-scale production and maturation of an oxygen-tolerant [NiFe]-hydrogenase from Cupriavidus necator in Escherichia coli PLoS One 8e6881
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Schmid VH (2008) Light-harvesting complexes of vascular plants Cell Mol Life Sci 65 3619-3639Pubmed Author and Title wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Google Scholar Author Only Title Only Author and Title
Shi T Bibby TS Jiang L Irwin AJ Falkowski PG (2005) Protein interactions limit the rate of evolution of photosynthetic genes incyanobacteria Mol Biol Evol 22 2179-2189
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS Protein Increases Electron Transport Ratesand Biomass Yield Plant Physiol 175 134-145
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J (2017) Plasmon-induced absorption of blindchlorophylls in photosynthetic proteins assembled on silver nanowires Nanoscale 9 10475-10486
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T Sakai M Fujii M Tohri A Iwai M Inoue YYoneyama S Minakata M Enami I (2009) Plugging a molecular wire into photosystem I reconstitution of the photoelectric conversionsystem on a gold electrode Angew Chem Int Ed Engl 48 1585-1587
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M Iwai M Taguchi S Enami I Inoue Y Yamanoi YYonezawa T Mizuno K Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M (2007) Bio-photosensorCyanobacterial photosystem I coupled with transistor via molecular wire Biochim Biophys Acta 1767 653-659
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N (2006) Functional replacement of ferredoxin by acyanobacterial flavodoxin in tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR Carrillo N (2007) Enhanced plant tolerance to ironstarvation by functional substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci U S A 104 11495-11500
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M Norici A Shotland Y Ohad I Kaplan A (2016) Themechanisms whereby the green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled photodamage resistanceNew Phytol 210 1229-1243
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from Photosystem I-catalyst hybrids Curr Opin Chem Biol25 1-8
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium Synechocystis sp PCC 6803 carrying spinachsequences Construction and function Photosynth Res 48 147-162
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene replacement in Synechocystis sp PCC 6803Microb Cell Fact 13 4
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron Protein Substitutes for Cyclic Electron Flow withoutCompeting CO2 Assimilation in Rice Plant Physiol 176 1509-1518
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) Plastocyanin is indispensable for photosyntheticelectron flow in Arabidopsis thaliana J Biol Chem 278 31286-31289
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M Thofner JF Olsen CE Mottawie MS Burow M Pribil MFeussner I Moller BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 dependent pathways intoSynechocystis sp PCC 6803 Metab Eng 33 1-11
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Google Scholar Author Only Title Only Author and Title
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in functional photosystem II complexes ofcyanobacteria Proc Natl Acad Sci U S A 98 14168-14173
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) Photosynthetic electron partitioning between [FeFe]-hydrogenase and ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S A 108 9396-9401
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of alternative electron flow by flavodiiron proteins inArabidopsis Nat Plants 2 16012
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ (2018) Ectopic expression of SsPETE2 a plastocyanin fromSuaeda salsa improves plant tolerance to oxidative stress Plant Sci 268 1-10
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Lin YH Pan KY Hung CH Huang HE Chen CL Feng TY Huang LF (2013) Overexpression of ferredoxin PETF enhances tolerance toheat stress in Chlamydomonas reinhardtii Int J Mol Sci 14 20913-20929
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Long SP Marshall-Colon A Zhu XG (2015) Meeting the global food demand of the future by engineering crop photosynthesis and yieldpotential Cell 161 56-66
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Loughlin P Lin Y Chen M (2013) Chlorophyll d and Acaryochloris marina current status Photosynth Res 116 277-293Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Lubitz W Ogata H Rudiger O Reijerse E (2014) Hydrogenases Chem Rev 114 4081-4148Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Lubner CE Applegate AM Knorzer P Ganago A Bryant DA Happe T Golbeck JH (2011) Solar hydrogen-producing bionanodeviceoutperforms natural photosynthesis Proc Natl Acad Sci U S A 108 20988-20991
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Lubner CE Knorzer P Silva PJ Vincent KA Happe T Bryant DA Golbeck JH (2010) Wiring an [FeFe]-hydrogenase with photosystem Ifor light-induced hydrogen production Biochemistry 49 10264-10266
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Martin BA Frymier PD (2017) A review of hydrogen production by photosynthetic organisms using whole-cell and cell-free systemsAppl Biochem Biotechnol 183 503-519
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
McTavish H (1998) Hydrogen evolution by direct electron transfer from photosystem I to hydrogenases J Biochem 123 644-649Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Mellor SB Nielsen AZ Burow M Motawia MS Jakubauskas D Moller BL Jensen PE (2016) Fusion of ferredoxin and cytochrome P450enables direct light-driven biosynthesis ACS Chem Biol 11 1862-1869
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Mellor SB Vavitsas K Nielsen AZ Jensen PE (2017) Photosynthetic fuel for heterologous enzymes the role of electron carrierproteins Photosynth Res 134 329-342
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Miyachi M Yamanoi Y Shibata Y Matsumoto H Nakazato K Konno M Ito K Inoue Y Nishihara H (2010) A photosensing systemcomposed of photosystem I molecular wire gold nanoparticle and double surfactants in water Chem Commun (Camb) 46 2557-2559
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Miyachi M Yamanoi Y Yonezawa T Nishihara H Iwai M Konno M Iwai M Inoue Y (2009) Surface immobilization of PSI using vitaminK1-like molecular wires for fabrication of a bio-photoelectrode J Nanosci Nanotechnol 9 1722-1726
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Molina-Heredia FP Wastl J Navarro JA Bendall DS Hervas M Howe CJ De La Rosa MA (2003) Photosynthesis a new function for anold cytochrome Nature 424 33-34
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Mullineaux CW Emlyn-Jones D (2005) State transitions an example of acclimation to low-light stress J Exp Bot 56 389-393Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nelson N (2009) Plant photosystem I--the most efficient nano-photochemical machine J Nanosci Nanotechnol 9 1709-1713Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nguyen K Bruce BD (2014) Growing green electricity progress and strategies for use of photosystem I for sustainable photovoltaicenergy conversion Biochim Biophys Acta 1837 1553-1566 wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nickelsen J Rengstl B (2013) Photosystem II assembly from cyanobacteria to plants Annu Rev Plant Biol 64 609-635Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nielsen AZ Mellor SB Vavitsas K Wlodarczyk AJ Gnanasekaran T Perestrello Ramos HdJM King BC Bakowski K Jensen PE (2016)Extending the biosynthetic repertoires of cyanobacteria and chloroplasts Plant J 87 87-102
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nielsen AZ Ziersen B Jensen K Lassen LM Olsen CE Moller BL Jensen PE (2013) Redirecting photosynthetic reducing powertoward bioactive natural product synthesis ACS Synth Biol 2 308-315
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nixon PJ Michoux F Yu J Boehm M Komenda J (2010) Recent advances in understanding the assembly and repair of photosystem IIAnn Bot 106 1-16
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Nixon PJ Rogner M Diner BA (1991) Expression of a higher plant psbA gene in Synechocystis 6803 yields a functional hybridphotosystem II reaction center complex Plant Cell 3 383-395
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Oey M Sawyer AL Ross IL Hankamer B (2016) Challenges and opportunities for hydrogen production from microalgae PlantBiotechnol J 14 1487-99
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pesaresi P Pribil M Wunder T Leister D (2011) Dynamics of reversible protein phosphorylation in thylakoids of flowering plants theroles of STN7 STN8 and TAP38 Biochim Biophys Acta 1807 887-896
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pesaresi P Scharfenberg M Weigel M Granlund I Schroder WP Finazzi G Rappaport F Masiero S Furini A Jahns P Leister D (2009)Mutants overexpressors and interactors of Arabidopsis plastocyanin isoforms revised roles of plastocyanin in photosyntheticelectron flow and thylakoid redox state Mol Plant 2 236-248
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pinnola A Ghin L Gecchele E Merlin M Alboresi A Avesani L Pezzotti M Capaldi S Cazzaniga S Bassi R (2015) Heterologousexpression of moss light-harvesting complex stress-related 1 (LHCSR1) the chlorophyll a-xanthophyll pigment-protein complexcatalyzing non-photochemical quenching in Nicotiana sp J Biol Chem 290 24340-24354
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Plumereacute N Nowaczyk MM (2016) Biophotoelectrochemistry of photosynthetic proteins Adv Biochem Eng Biotechnol 158 111-136Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Pribil M Pesaresi P Hertle A Barbato R Leister D (2010) Role of plastid protein phosphatase TAP38 in LHCII dephosphorylation andthylakoid electron flow PLoS Biol 8 e1000288
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Rasool S Mohamed R (2016) Plant cytochrome P450s nomenclature and involvement in natural product biosynthesis Protoplasma253 1197-1209
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Rochaix JD (2007) Role of thylakoid protein kinases in photosynthetic acclimation FEBS Lett 581 2768-2775Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Schiffels J Pinkenburg O Schelden M Aboulnaga el-HA Baumann ME Selmer T (2013) An innovative cloning platform enables large-scale production and maturation of an oxygen-tolerant [NiFe]-hydrogenase from Cupriavidus necator in Escherichia coli PLoS One 8e6881
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Schmid VH (2008) Light-harvesting complexes of vascular plants Cell Mol Life Sci 65 3619-3639Pubmed Author and Title wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Google Scholar Author Only Title Only Author and Title
Shi T Bibby TS Jiang L Irwin AJ Falkowski PG (2005) Protein interactions limit the rate of evolution of photosynthetic genes incyanobacteria Mol Biol Evol 22 2179-2189
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS Protein Increases Electron Transport Ratesand Biomass Yield Plant Physiol 175 134-145
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J (2017) Plasmon-induced absorption of blindchlorophylls in photosynthetic proteins assembled on silver nanowires Nanoscale 9 10475-10486
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T Sakai M Fujii M Tohri A Iwai M Inoue YYoneyama S Minakata M Enami I (2009) Plugging a molecular wire into photosystem I reconstitution of the photoelectric conversionsystem on a gold electrode Angew Chem Int Ed Engl 48 1585-1587
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M Iwai M Taguchi S Enami I Inoue Y Yamanoi YYonezawa T Mizuno K Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M (2007) Bio-photosensorCyanobacterial photosystem I coupled with transistor via molecular wire Biochim Biophys Acta 1767 653-659
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N (2006) Functional replacement of ferredoxin by acyanobacterial flavodoxin in tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR Carrillo N (2007) Enhanced plant tolerance to ironstarvation by functional substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci U S A 104 11495-11500
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M Norici A Shotland Y Ohad I Kaplan A (2016) Themechanisms whereby the green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled photodamage resistanceNew Phytol 210 1229-1243
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from Photosystem I-catalyst hybrids Curr Opin Chem Biol25 1-8
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium Synechocystis sp PCC 6803 carrying spinachsequences Construction and function Photosynth Res 48 147-162
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene replacement in Synechocystis sp PCC 6803Microb Cell Fact 13 4
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron Protein Substitutes for Cyclic Electron Flow withoutCompeting CO2 Assimilation in Rice Plant Physiol 176 1509-1518
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) Plastocyanin is indispensable for photosyntheticelectron flow in Arabidopsis thaliana J Biol Chem 278 31286-31289
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M Thofner JF Olsen CE Mottawie MS Burow M Pribil MFeussner I Moller BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 dependent pathways intoSynechocystis sp PCC 6803 Metab Eng 33 1-11
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Google Scholar Author Only Title Only Author and Title
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in functional photosystem II complexes ofcyanobacteria Proc Natl Acad Sci U S A 98 14168-14173
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) Photosynthetic electron partitioning between [FeFe]-hydrogenase and ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S A 108 9396-9401
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of alternative electron flow by flavodiiron proteins inArabidopsis Nat Plants 2 16012
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ (2018) Ectopic expression of SsPETE2 a plastocyanin fromSuaeda salsa improves plant tolerance to oxidative stress Plant Sci 268 1-10
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
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Shi T Bibby TS Jiang L Irwin AJ Falkowski PG (2005) Protein interactions limit the rate of evolution of photosynthetic genes incyanobacteria Mol Biol Evol 22 2179-2189
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Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS Protein Increases Electron Transport Ratesand Biomass Yield Plant Physiol 175 134-145
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Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J (2017) Plasmon-induced absorption of blindchlorophylls in photosynthetic proteins assembled on silver nanowires Nanoscale 9 10475-10486
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Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T Sakai M Fujii M Tohri A Iwai M Inoue YYoneyama S Minakata M Enami I (2009) Plugging a molecular wire into photosystem I reconstitution of the photoelectric conversionsystem on a gold electrode Angew Chem Int Ed Engl 48 1585-1587
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Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M Iwai M Taguchi S Enami I Inoue Y Yamanoi YYonezawa T Mizuno K Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M (2007) Bio-photosensorCyanobacterial photosystem I coupled with transistor via molecular wire Biochim Biophys Acta 1767 653-659
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Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N (2006) Functional replacement of ferredoxin by acyanobacterial flavodoxin in tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050
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Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR Carrillo N (2007) Enhanced plant tolerance to ironstarvation by functional substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci U S A 104 11495-11500
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Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M Norici A Shotland Y Ohad I Kaplan A (2016) Themechanisms whereby the green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled photodamage resistanceNew Phytol 210 1229-1243
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from Photosystem I-catalyst hybrids Curr Opin Chem Biol25 1-8
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium Synechocystis sp PCC 6803 carrying spinachsequences Construction and function Photosynth Res 48 147-162
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene replacement in Synechocystis sp PCC 6803Microb Cell Fact 13 4
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron Protein Substitutes for Cyclic Electron Flow withoutCompeting CO2 Assimilation in Rice Plant Physiol 176 1509-1518
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) Plastocyanin is indispensable for photosyntheticelectron flow in Arabidopsis thaliana J Biol Chem 278 31286-31289
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M Thofner JF Olsen CE Mottawie MS Burow M Pribil MFeussner I Moller BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 dependent pathways intoSynechocystis sp PCC 6803 Metab Eng 33 1-11
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Google Scholar Author Only Title Only Author and Title
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in functional photosystem II complexes ofcyanobacteria Proc Natl Acad Sci U S A 98 14168-14173
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) Photosynthetic electron partitioning between [FeFe]-hydrogenase and ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S A 108 9396-9401
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of alternative electron flow by flavodiiron proteins inArabidopsis Nat Plants 2 16012
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ (2018) Ectopic expression of SsPETE2 a plastocyanin fromSuaeda salsa improves plant tolerance to oxidative stress Plant Sci 268 1-10
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
Google Scholar Author Only Title Only Author and Title
Shi T Bibby TS Jiang L Irwin AJ Falkowski PG (2005) Protein interactions limit the rate of evolution of photosynthetic genes incyanobacteria Mol Biol Evol 22 2179-2189
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Simkin AJ McAusland L Lawson T Raines CA (2017) Overexpression of the RieskeFeS Protein Increases Electron Transport Ratesand Biomass Yield Plant Physiol 175 134-145
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Szalkowski M Janna Olmos JD Buczyńska D Maćkowski S Kowalska D Kargul J (2017) Plasmon-induced absorption of blindchlorophylls in photosynthetic proteins assembled on silver nanowires Nanoscale 9 10475-10486
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Terasaki N Yamamoto N Hiraga T Yamanoi Y Yonezawa T Nishihara H Ohmori T Sakai M Fujii M Tohri A Iwai M Inoue YYoneyama S Minakata M Enami I (2009) Plugging a molecular wire into photosystem I reconstitution of the photoelectric conversionsystem on a gold electrode Angew Chem Int Ed Engl 48 1585-1587
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Terasaki N Yamamoto N Tamada K Hattori M Hiraga T Tohri A Sato I Iwai M Iwai M Taguchi S Enami I Inoue Y Yamanoi YYonezawa T Mizuno K Murata M Nishihara H Yoneyama S Minakata M Ohmori T Sakai M Fujii M (2007) Bio-photosensorCyanobacterial photosystem I coupled with transistor via molecular wire Biochim Biophys Acta 1767 653-659
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Tognetti VB Palatnik JF Fillat MF Melzer M Hajirezaei MR Valle EM Carrillo N (2006) Functional replacement of ferredoxin by acyanobacterial flavodoxin in tobacco confers broad-range stress tolerance Plant Cell 18 2035-2050
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Tognetti VB Zurbriggen MD Morandi EN Fillat MF Valle EM Hajirezaei MR Carrillo N (2007) Enhanced plant tolerance to ironstarvation by functional substitution of chloroplast ferredoxin with a bacterial flavodoxin Proc Natl Acad Sci U S A 104 11495-11500
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Treves H Raanan H Kedem I Murik O Keren N Zer H Berkowicz SM Giordano M Norici A Shotland Y Ohad I Kaplan A (2016) Themechanisms whereby the green alga Chlorella ohadii isolated from desert soil crust exhibits unparalleled photodamage resistanceNew Phytol 210 1229-1243
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Utschig LM Soltau SR Tiede DM (2015) Light-driven hydrogen production from Photosystem I-catalyst hybrids Curr Opin Chem Biol25 1-8
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Vermaas WF Shen G Ohad I (1996) Chimaeric CP47 mutants of the cyanobacterium Synechocystis sp PCC 6803 carrying spinachsequences Construction and function Photosynth Res 48 147-162
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Viola S Ruhle T Leister D (2014) A single vector-based strategy for marker-less gene replacement in Synechocystis sp PCC 6803Microb Cell Fact 13 4
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Wada S Yamamoto H Suzuki Y Yamori W Shikanai T Makino A (2018) Flavodiiron Protein Substitutes for Cyclic Electron Flow withoutCompeting CO2 Assimilation in Rice Plant Physiol 176 1509-1518
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Weigel M Varotto C Pesaresi P Finazzi G Rappaport F Salamini F Leister D (2003) Plastocyanin is indispensable for photosyntheticelectron flow in Arabidopsis thaliana J Biol Chem 278 31286-31289
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Wlodarczyk A Gnanasekaran T Nielsen AZ Zulu NN Mellor SB Luckner M Thofner JF Olsen CE Mottawie MS Burow M Pribil MFeussner I Moller BL Jensen PE (2016) Metabolic engineering of light-driven cytochrome P450 dependent pathways intoSynechocystis sp PCC 6803 Metab Eng 33 1-11
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title wwwplantphysiolorgon April 12 2020 - Published by Downloaded from
Copyright copy 2018 American Society of Plant Biologists All rights reserved
Google Scholar Author Only Title Only Author and Title
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in functional photosystem II complexes ofcyanobacteria Proc Natl Acad Sci U S A 98 14168-14173
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) Photosynthetic electron partitioning between [FeFe]-hydrogenase and ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S A 108 9396-9401
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of alternative electron flow by flavodiiron proteins inArabidopsis Nat Plants 2 16012
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ (2018) Ectopic expression of SsPETE2 a plastocyanin fromSuaeda salsa improves plant tolerance to oxidative stress Plant Sci 268 1-10
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-
Google Scholar Author Only Title Only Author and Title
Xu H Vavilin D Vermaas W (2001) Chlorophyll b can serve as the major pigment in functional photosystem II complexes ofcyanobacteria Proc Natl Acad Sci U S A 98 14168-14173
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yacoby I Pochekailov S Toporik H Ghirardi ML King PW Zhang S (2011) Photosynthetic electron partitioning between [FeFe]-hydrogenase and ferredoxinNADP+-oxidoreductase (FNR) enzymes in vitro Proc Natl Acad Sci U S A 108 9396-9401
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Yamamoto H Takahashi S Badger MR Shikanai T (2016) Artificial remodelling of alternative electron flow by flavodiiron proteins inArabidopsis Nat Plants 2 16012
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
Zhou XT Wang F Ma YP Jia LJ Liu N Wang HY Zhao P Xia GX Zhong NQ (2018) Ectopic expression of SsPETE2 a plastocyanin fromSuaeda salsa improves plant tolerance to oxidative stress Plant Sci 268 1-10
Pubmed Author and TitleGoogle Scholar Author Only Title Only Author and Title
wwwplantphysiolorgon April 12 2020 - Published by Downloaded from Copyright copy 2018 American Society of Plant Biologists All rights reserved
- Parsed Citations
- Article File
- Figure 1
- Figure 2
- Figure 3
- Figure 4
- Figure 5
- Advances Box
- Outstanding Questions Box
- Box 1
- Box 1 Figure
- Box 2
- Box 3
- Parsed Citations
-