4UFN

Laboratory evolved variant R-C1B1 of potato epoxide hydrolase StEH1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.171 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Conformational Diversity and Enantioconvergence in Potato Epoxide Hydrolase 1.

Bauer, P.Carlsson, A.J.Amrein, B.A.Dobritzsch, D.Widersten, M.Kamerlin, S.C.L.

(2016) Org.Biomol.Chem. 14: 5639

  • DOI: 10.1039/c6ob00060f

  • PubMed Abstract: 
  • Potato epoxide hydrolase 1 (StEH1) is a biocatalytically important enzyme that exhibits rich enantio- and regioselectivity in the hydrolysis of chiral epoxide substrates. In particular, StEH1 has been demonstrated to enantioconvergently hydrolyze rac ...

    Potato epoxide hydrolase 1 (StEH1) is a biocatalytically important enzyme that exhibits rich enantio- and regioselectivity in the hydrolysis of chiral epoxide substrates. In particular, StEH1 has been demonstrated to enantioconvergently hydrolyze racemic mixes of styrene oxide (SO) to yield (R)-1-phenylethanediol. This work combines computational, crystallographic and biochemical analyses to understand both the origins of the enantioconvergent behavior of the wild-type enzyme, as well as shifts in activities and substrate binding preferences in an engineered StEH1 variant, R-C1B1, which contains four active site substitutions (W106L, L109Y, V141K and I155V). Our calculations are able to reproduce both the enantio- and regioselectivities of StEH1, and demonstrate a clear link between different substrate binding modes and the corresponding selectivity, with the preferred binding modes being shifted between the wild-type enzyme and the R-C1B1 variant. Additionally, we demonstrate that the observed changes in selectivity and the corresponding enantioconvergent behavior are due to a combination of steric and electrostatic effects that modulate both the accessibility of the different carbon atoms to the nucleophilic side chain of D105, as well as the interactions between the substrate and protein amino acid side chains and active site water molecules. Being able to computationally predict such subtle effects for different substrate enantiomers, as well as to understand their origin and how they are affected by mutations, is an important advance towards the computational design of improved biocatalysts for enantioselective synthesis.


    Organizational Affiliation

    Science for Life Laboratory, Department of Cell and Molecular Biology, Uppsala University, BMC Box 596, S-751 24 Uppsala, Sweden. kamerlin@icm.uu.se.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
EPOXIDE HYDROLASE
A, B
328Solanum tuberosumMutation(s): 5 
Find proteins for Q41415 (Solanum tuberosum)
Go to UniProtKB:  Q41415
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DIO
Query on DIO

Download SDF File 
Download CCD File 
A, B
1,4-DIETHYLENE DIOXIDE
C4 H8 O2
RYHBNJHYFVUHQT-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.171 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 56.003α = 90.00
b = 99.140β = 90.00
c = 123.461γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
PHASERphasing
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: 2016-10-19
    Type: Database references