IRENE Conference
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Transcript of IRENE Conference

Industrial Strength QM/MM: Computa8onal high throughput screening of enzyme ac8vity in enzyme mutants
Jan H. Jensen, Mar$n Hediger, Luca De Vico, Kasper Primdal, Allan Svendsen, Werner Besenma=er
Department of Chemistry University of Copenhagen
MarFn R. Hediger, Luca De Vico, Allan Svendsen, Werner Besenma=er, Jan H. Jensen “A ComputaFonal Methodology to Screen AcFviFes of Enzyme Variants” PLoS ONE, submi=ed.
h=p://arxiv.org/abs/1203.2950
Slides at: h=p://Fnyurl.com/bsqbojf

Goal
Automated predicFon of barrier height for enzymaFc reacFon within 24 hr using < 10 cores IdenFfies promising candidates for further study
Industrial enzyme design
High-‐through put screening of 100s of mutants IdenFfies promising candidates for further study
ComputaFonal predicFon: Homology modeling
QSAR (QM or QM/MM too slow and lacks automaFon) IdenFfies promising candidates for further study
Further study: 20-‐50 mutants
Slides at: h=p://Fnyurl.com/bsqbojf

Methods
PM6 implemented in Mopac2009 (MOZYME)
Automated mutant builder (PYMOL)
Barrier from adiabaFc mapping
Applica$on Increase amidase acFvity in an estarase (CalB)
MarFn R. Hediger, Luca De Vico, Allan Svendsen, Werner Besenma=er, Jan H. Jensen “A ComputaFonal Methodology to Screen AcFviFes of Enzyme Variants” PLoS ONE, submi=ed.

PM6 is good enough

PM6 and MOZYME MOZYME = PM6 computed with MOZYME
PM6 = PM6//MOZYME MOZYMEReortho = MOZYME//MOZYME

PM6/MOZYME is fast enough
MOPAC2009 No parallelized
55 aa

PM6/MOZYME is fast enough
OpFmizaFon Single point



Future Direc$ons
Whole protein COSMO solvaFon
More automaFzaFon Be=er sampling
Complete scan of single mutants Single -‐> double -‐> triple mutants
PM6 in GAMESS Linear scaling PM6 PM6/PCM interface
AlternaFves to adiabaFc mapping
Beyond PM6: EFMO

Blurring the boundary between linear scaling QM, QM/MM and polarizable force fields
The Effec@ve Fragment Molecular Orbital Method
Jan H. Jensen, Casper Steinmann, Mikael Wistoi Ibsen, Kasper Thoie University of Copenhagen
Dmitri Fedorov AIST, Japan
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Casper Steinmann, Dmitri G. Fedorov, and Jan H. Jensen “The EffecFve Fragment Molecular Orbital Method: A Merger of the Fragment Molecular Orbital and EffecFve Fragment PotenFal Methods” Journal of Physical Chemistry A 2010, 114, 8705-‐8712
Casper Steinmann, Dmitri G. Fedorov, and Jan H. Jensen “The EffecFve Fragment Molecular Orbital Method for Fragments Connected by Covalent Bonds” PLoS ONE, submi=ed. h=p://arxiv.org/abs/1202.4935

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The Effec$ve Fragment Molecular Orbital (EFMO) method Using ideas from the EffecFve Fragment PotenFal (EFP) and the Fragment Molecular Orbital (FMO) method

The Effec$ve Fragment Molecular Orbital (EFMO) method (Using ideas from the EffecFve Fragment PotenFal (EFP) method)
Monomer SCF in the gas phase
Extract mulFpoles and dipole polarizability
13

The Effec$ve Fragment Molecular Orbital (EFMO) method (Using ideas from the EffecFve Fragment PotenFal (EFP) method)
Many-‐body polariza$on
Computed classically using induced dipoles for enFre system
14

The Effec$ve Fragment Molecular Orbital (EFMO) method (Using ideas from the EffecFve Fragment PotenFal (EFP) method)
Coulomb and Non-‐Coulomb effects
dimer SCF in the gas phase
15

The Effec$ve Fragment Molecular Orbital (EFMO) method (Using ideas from the EffecFve Fragment PotenFal (EFP) method)
Coulomb effects
Computed using staFc mulFpoles
16

MP2 (DFT doesn’t scale well)
+ 0
17

Covalent Fragmenta$on (ElectrostaFc screening crucial)
18

Implemented in GAMESS With gradients
Trp cage (20 residues) 2 residues/fragment
EFMO FMO2 Error in energy -‐4.3 6.4 kcal/mol
MP2/6-‐31G(d) gradient 314 409 minutes 20 cores (most Fme spent in MP2 dimers)
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QM/”MM” PCM
Large parts of MM region oien frozen
= Requires only monomer gas phase calculaFons
for that region =
Very fast
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To Do
Flexible EFP/Polarizable “Force Field”
EEFMO = EI0
I
N
∑ + EIJ0 − EI
0 − EJ0 − EIJ
POL( )IJ
covalentdimers
∑
+ EIJES + EIJ
XR /CT + EIJDisp( )
IJ
N
∑ + EtotPOL
Important miscellanea
EFMO GUI: FRAGIT (Mikael Ibsen)
TS search algorithms (Kasper Thoie)
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Funding: EU (IRENE collab program)
Thank You!
Ques$ons?
22
Slides at: h=p://Fnyurl.com/bsqbojf