3ZN2

protein engineering of halohydrin dehalogenase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.212 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

A Single Point Mutation Enhances Hydroxynitrile Synthesis by Halohydrin Dehalogenase.

Schallmey, M.Jekel, P.Tang, L.Majeric Elenkov, M.Hoffken, H.W.Hauer, B.Janssen, D.B.

(2015) Enzyme.Microb.Technol. 70: 50

  • DOI: 10.1016/j.enzmictec.2014.12.009

  • PubMed Abstract: 
  • The cyanide-mediated ring opening of epoxides catalyzed by halohydrin dehalogenases yields β-hydroxynitriles that are of high interest for synthetic chemistry. The best studied halohydrin dehalogenase to date is the enzyme from Agrobacterium radiobac ...

    The cyanide-mediated ring opening of epoxides catalyzed by halohydrin dehalogenases yields β-hydroxynitriles that are of high interest for synthetic chemistry. The best studied halohydrin dehalogenase to date is the enzyme from Agrobacterium radiobacter, but this enzyme (HheC) exhibits only low cyanolysis activities. Sequence comparison between a pair of related halohydrin dehalogenases from Corynebacterium and Mycobacterium suggested that substitution of a threonine that interacts with the active site might be responsible for the higher cyanolytic activity of the former enzyme. Here we report that a variant of HheC in which this substitution (T134A) is adopted displays an up to 11-fold higher activity in cyanide-mediated epoxide ring-opening. The mutation causes removal of the hydrogen bond between residue 134 and the side chain O of the active site serine 132, which donates a hydrogen bond to the substrate oxygen. The mutation also increases dehalogenase rates with various substrates. Structural analysis revealed that the anion-binding site of the mutant enzyme remained unaltered, showing that the enhanced activity is due to altered interactions with the substrate oxygen rather than changes in the nucleophile binding site.


    Organizational Affiliation

    Department of Biochemistry, Groningen Biomolecular Science and Biotechnology Institute, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HALOHYDRIN DEHALOGENASE
A, B
254Rhizobium radiobacterMutation(s): 3 
Gene Names: hheC
Find proteins for Q93D82 (Rhizobium radiobacter)
Go to UniProtKB:  Q93D82
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

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Download CCD File 
B
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
PG5
Query on PG5

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Download CCD File 
B
1-METHOXY-2-[2-(2-METHOXY-ETHOXY]-ETHANE
C8 H18 O4
YFNKIDBQEZZDLK-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

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Download CCD File 
A, B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

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Download CCD File 
A
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.212 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 103.330α = 90.00
b = 103.330β = 90.00
c = 118.430γ = 90.00
Software Package:
Software NamePurpose
XDSdata scaling
REFMACrefinement
XDSdata reduction
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-03-05
    Type: Initial release
  • Version 1.1: 2015-03-11
    Type: Database references