Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PQS (software)

Biological Assembly 2  

 3D View: Structure | Electron Density

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors and generated by PQS (software)

Macromolecule Content

• Total Structure Weight: 74.15 kDa 
• Atom Count: 5471 
• Residue Count: 641 
• Unique protein chains: 1

4UFO

Laboratory evolved variant R-C1B1D33E6 of potato epoxide hydrolase StEH1

• DOI: 10.2210/pdb4UFO/pdb

• Classification: HYDROLASE
• Organism(s): Solanum tuberosum
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2015-03-17 Released: 2016-04-13 
• Deposition Author(s): Carlsson, A.J., Bauer, P., Nilsson, M., Dobritzsch, D., Kamerlin, S.C.L., Widersten, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.02 Å
• R-Value Free: 0.232 
• R-Value Work: 0.189 
• R-Value Observed: 0.191 

Literature

Laboratory Evolved Enzymes Provide Snapshots of the Development of Enantioconvergence in Enzyme-Catalyzed Epoxide Hydrolysis.

Janfalk Carlsson, A., Bauer, P., Dobritzsch, D., Nilsson, M., Kamerlin, S.C., Widersten, M.

(2016) Chembiochem 17: 1693

• PubMed: 27383542 
• DOI: 10.1002/cbic.201600330
• Structures With Same Primary Citation


• PubMed Abstract: 
  

Engineered enzyme variants of potato epoxide hydrolase (StEH1) display varying degrees of enrichment of (2R)-3-phenylpropane-1,2-diol from racemic benzyloxirane. Curiously, the observed increase in the enantiomeric excess of the (R)-diol is not only a consequence of changes in enantioselectivity for the preferred epoxide enantiomer, but also to changes in the regioselectivity of the epoxide ring opening of (S)-benzyloxirane. In order to probe the structural origin of these differences in substrate selectivity and catalytic regiopreference, we solved the crystal structures for the evolved StEH1 variants. We used these structures as a starting point for molecular docking studies of the epoxide enantiomers into the respective active sites. Interestingly, despite the simplicity of our docking analysis, the apparent preferred binding modes appear to rationalize the experimentally determined regioselectivities. The analysis also identifies an active site residue (F33) as a potentially important interaction partner, a role that could explain the high conservation of this residue during evolution. Overall, our experimental, structural, and computational studies provide snapshots into the evolution of enantioconvergence in StEH1-catalyzed epoxide hydrolysis.

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Organizational Affiliation: 

Department of Chemistry, BMC, Uppsala University, Box 576, 751 23, Uppsala, Sweden. [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
EPOXIDE HYDROLASE	A, B	328	Solanum tuberosum	Mutation(s): 7  EC: 3.3.2.3
Find proteins for Q41415 (Solanum tuberosum) Explore Q41415  Go to UniProtKB:  Q41415

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.02 Å
• R-Value Free: 0.232 
• R-Value Work: 0.189 
• R-Value Observed: 0.191 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 55.678	α = 90
b = 98.444	β = 90
c = 122.571	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
XDS	data reduction
Aimless	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2015-03-17 
• Released Date: 2016-04-13 
Deposition Author(s): Carlsson, A.J., Bauer, P., Nilsson, M., Dobritzsch, D., Kamerlin, S.C.L., Widersten, M.

Revision History 

• Version 1.0: 2016-04-13
  Type: Initial release
  
• Version 1.1: 2016-07-20
  Changes: Database references
• Version 1.2: 2016-10-05
  Changes: Database references