4UFO

Laboratory evolved variant R-C1B1D33E6 of potato epoxide hydrolase StEH1


Experimental Data Snapshot

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

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

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

  • DOI: 10.1002/cbic.201600330
  • Primary Citation of Related Structures:  

  • 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 ...

    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.


    Organizational Affiliation

    Department of Chemistry, BMC, Uppsala University, Box 576, 751 23, Uppsala, Sweden.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
EPOXIDE HYDROLASE
A, B
328Solanum tuberosumMutation(s): 7 
Find proteins for Q41415 (Solanum tuberosum)
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 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 55.678α = 90.00
b = 98.444β = 90.00
c = 122.571γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
XDSdata reduction
REFMACrefinement
Aimlessdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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