5HY5

Crystal Structure of a Tryptophan 6-halogenase (SttH) from Streptomyces toxytricini


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.68 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.196 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

A Structure-Guided Switch in the Regioselectivity of a Tryptophan Halogenase.

Shepherd, S.A.Menon, B.R.Fisk, H.Struck, A.W.Levy, C.Leys, D.Micklefield, J.

(2016) Chembiochem 17: 821-824

  • DOI: 10.1002/cbic.201600051

  • PubMed Abstract: 
  • Flavin-dependent halogenases are potentially useful biocatalysts for the regioselective halogenation of aromatic compounds. Haloaromatic compounds can be utilised in the synthesis and biosynthesis of pharmaceuticals and other valuable products. Here ...

    Flavin-dependent halogenases are potentially useful biocatalysts for the regioselective halogenation of aromatic compounds. Haloaromatic compounds can be utilised in the synthesis and biosynthesis of pharmaceuticals and other valuable products. Here we report the first X-ray crystal structure of a tryptophan 6-halogenase (SttH), which enabled key residues that contribute to the regioselectivity in tryptophan halogenases to be identified. Structure-guided mutagenesis resulted in a triple mutant (L460F/P461E/P462T) that exhibited a complete switch in regioselectivity; with the substrate 3-indolepropionate 75 % 5-chlorination was observed with the mutant in comparison to 90 % 6-chlorination for the wild-type SttH. This is the first clear example of how regiocomplementary halogenases can be created from a single parent enzyme. The biocatalytic repertoire of SttH was also expanded to include a range of indolic and non-indolic substrates.


    Organizational Affiliation

    School of Chemistry and Manchester Institute of Biotechnology, The University of Manchester, 131 Princess Street, Manchester, M1 7DN, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Tryptophan 6-halogenase
A, B
523Streptomyces toxytriciniMutation(s): 0 
Gene Names: stth
Find proteins for E9P162 (Streptomyces toxytricini)
Go to UniProtKB:  E9P162
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
FAD
Query on FAD

Download SDF File 
Download CCD File 
A, B
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.68 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.196 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 171.660α = 90.00
b = 101.570β = 99.08
c = 83.120γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
xia2data scaling
PHENIXrefinement
xia2data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2016-02-01 
  • Released Date: 2016-02-17 
  • Deposition Author(s): Levy, C.

Revision History 

  • Version 1.0: 2016-02-17
    Type: Initial release
  • Version 1.1: 2016-04-20
    Type: Database references
  • Version 1.2: 2016-05-11
    Type: Database references