2AQJ

The structure of tryptophan 7-halogenase (PrnA) suggests a mechanism for regioselective chlorination


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.168 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Tryptophan 7-halogenase (PrnA) structure suggests a mechanism for regioselective chlorination.

Dong, C.Flecks, S.Unversucht, S.Haupt, C.van Pee, K.H.Naismith, J.H.

(2005) Science 309: 2216-2219

  • DOI: 10.1126/science.1116510
  • Primary Citation of Related Structures:  2AR8, 2ARD, 2APG
  • Also Cited By: 2JKC

  • PubMed Abstract: 
  • Chlorinated natural products include vancomycin and cryptophycin A. Their biosynthesis involves regioselective chlorination by flavin-dependent halogenases. We report the structural characterization of tryptophan 7-halogenase (PrnA), which regioselec ...

    Chlorinated natural products include vancomycin and cryptophycin A. Their biosynthesis involves regioselective chlorination by flavin-dependent halogenases. We report the structural characterization of tryptophan 7-halogenase (PrnA), which regioselectively chlorinates tryptophan. Tryptophan and flavin adenine dinucleotide (FAD) are separated by a 10 angstrom-long tunnel and bound by distinct enzyme modules. The FAD module is conserved in halogenases and is related to flavin-dependent monooxygenases. On the basis of biochemical studies, crystal structures, and by analogy with monooxygenases, we predict that FADH2 reacts with O2 to make peroxyflavin, which is decomposed by Cl-. The resulting HOCl is guided through the tunnel to tryptophan, where it is activated to participate in electrophilic aromatic substitution.


    Related Citations: 
    • Crystallization and X-ray diffraction of a halogenating enzyme, tryptophan 7-halogenase, from Pseudomonas fluorescens
      Dong, C.,Kotzsch, A.,Dorward, M.,Van Pee, K.-H.,Naismith, J.H.
      (2004) Acta Crystallogr.,Sect.D 60: 1438


    Organizational Affiliation

    Centre for Biomolecular Sciences, EaStchem, University of St. Andrews, St. Andrews KY16 9ST, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
tryptophan halogenase, PrnA
A
538Pseudomonas fluorescensGene Names: prnA
EC: 1.14.19.9
Find proteins for P95480 (Pseudomonas fluorescens)
Go to UniProtKB:  P95480
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

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

Download SDF File 
Download CCD File 
A
FLAVIN-ADENINE DINUCLEOTIDE
C27 H33 N9 O15 P2
VWWQXMAJTJZDQX-UYBVJOGSSA-N
 Ligand Interaction
TRP
Query on TRP

Download SDF File 
Download CCD File 
A
TRYPTOPHAN
C11 H12 N2 O2
QIVBCDIJIAJPQS-VIFPVBQESA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.168 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 67.630α = 90.00
b = 67.630β = 90.00
c = 276.027γ = 90.00
Software Package:
Software NamePurpose
CCP4data scaling
SOLVEphasing
SCALAdata scaling
MOSFLMdata reduction
RESOLVEphasing
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-10-04
    Type: Initial release
  • Version 1.1: 2008-04-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance