Chemistry 15.3-Carbon-fixation-dark-reactions
Transcript of Chemistry 15.3-Carbon-fixation-dark-reactions
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Chapter 15 (part 3)
Carbon Fixation (dark reactions)
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Carbon Dioxide Fixation
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Reductive Pentose Phosphate Cycle
6CO2+9ATP+5H20 9ADP+8Pi+6NADP++(DHAP or G3P)
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Ribulose-1,5-Bisphosphate carboxylase/oxygenase
(rubisco)
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Activation of Rubisco
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Mg2+ plays role in binding and activating R 1,6-BP to accept
CO2
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Rubisco Rxn Mechanisms
carboxylase
oxygenase
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Reductive Pentose Phosphate Cycle
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Reduction Stage
Phosphoglycerate kinase
Glyceraldehyde dehydrogenase
aldolase
F 1,6-bisphophatase
cytosol
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Reductive Pentose Phosphate Cycle
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Transketolases and Aldolases are used to make 5 carbon
sugars
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Formation of 5 Carbon Sugars
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F-6-P + 2 G3P + DHAP + 3 ATP 3 R-1,5-BP + 3 ADP
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Regulation of RPP
Cycle
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Thioredoxin
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Oxygenase Activity of Rubisco
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Photorespiration
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C4 Photosynthesis
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CAM Photosynthesis
stoma
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