5B12

Crystal structure of the B-type halohydrin hydrogen-halide-lyase mutant F71W/Q125T/D199H from Corynebacterium sp. N-1074


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.721 Å
  • R-Value Free: 0.194 
  • R-Value Work: 0.162 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Improvement of enantioselectivity of the B-type halohydrin hydrogen-halide-lyase from Corynebacterium sp. N-1074

Watanabe, F.Yu, F.Ohtaki, A.Yamanaka, Y.Noguchi, K.Odaka, M.Yohda, M.

(2016) J.Biosci.Bioeng. 122: 270-275

  • DOI: 10.1016/j.jbiosc.2016.02.003

  • PubMed Abstract: 
  • Halohydrin hydrogen-halide-lyase (H-Lyase) is a bacterial enzyme involved in the degradation of halohydrins. This enzyme catalyzes the intramolecular nucleophilic displacement of a halogen by a vicinal hydroxyl group in halohydrins, producing the cor ...

    Halohydrin hydrogen-halide-lyase (H-Lyase) is a bacterial enzyme involved in the degradation of halohydrins. This enzyme catalyzes the intramolecular nucleophilic displacement of a halogen by a vicinal hydroxyl group in halohydrins, producing the corresponding epoxides. The H-Lyases have been classified into A, B and C subtypes based on amino acid sequence similarities. These enzymes have attracted much attention as industrial catalysts in the synthesis of chiral chemicals from prochiral halohydrins. In the present study, we constructed mutants of B-type H-Lyase from Corynebacterium sp. N-1074 (HheB) displaying higher enantioselectivity by structure-based site-directed mutagenesis and random mutagenesis. A triple mutant of HheB exhibited 98.5% enantioselectivity, the highest ever reported, toward (R)-4-chloro-3-hydroxy-butyronitrile production, with the yield reaching approximately two-fold that of the wild-type enzyme. We discuss the structural basis of the high enantioselectivity and productivity of the mutant by comparing the crystal structures of the mutant HheB and the wild-type enzyme in complex with or without the substrate analogue.


    Organizational Affiliation

    Yokohama Research Laboratories, Mitsubishi Rayon Co. Ltd., Yokohama, Kanagawa 230-0053, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Halohydrin epoxidase B
A, B, C, D, E, F
227Corynebacterium spMutation(s): 3 
Gene Names: hheB
Find proteins for Q46347 (Corynebacterium sp)
Go to UniProtKB:  Q46347
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A, B, C, D, E, F
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.721 Å
  • R-Value Free: 0.194 
  • R-Value Work: 0.162 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 120.913α = 90.00
b = 215.005β = 90.00
c = 104.864γ = 90.00
Software Package:
Software NamePurpose
MOLREPphasing
HKL-2000data reduction
PHENIXrefinement
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-08-03
    Type: Initial release
  • Version 1.1: 2016-08-10
    Type: Database references
  • Version 1.2: 2017-02-15
    Type: Other