3LT5

X-ray Crystallographic structure of a Pseudomonas Aeruginosa Azoreductase in complex with balsalazide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.154 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

A Novel Mechanism for Azoreduction

Ryan, A.Laurieri, N.Westwood, I.Wang, C.-J.Lowe, E.Sim, E.

(2010) J.Mol.Biol. 400: 24-37

  • DOI: 10.1016/j.jmb.2010.04.023

  • PubMed Abstract: 
  • Azoreductases are important due to their ability to activate anti-inflammatory azo pro-drugs and to detoxify azo dyes. Three genes encoding azoreductases have been identified in Pseudomonas aeruginosa. We describe here a comparison of the three enzym ...

    Azoreductases are important due to their ability to activate anti-inflammatory azo pro-drugs and to detoxify azo dyes. Three genes encoding azoreductases have been identified in Pseudomonas aeruginosa. We describe here a comparison of the three enzymes. The pure recombinant proteins each have a distinct substrate specificity profile against a range of azo substrates. Using the structure of P. aeruginosa azoreductase (paAzoR) 1 and the homology models of paAzoR2 and paAzoR3, we have identified residues important for substrate specificity. We have defined a novel flavin mononucleotide binding cradle, which is a recurrent motif in many flavodoxin-like proteins. A novel structure of paAzoR1 with the azo pro-drug balsalazide bound within the active site was determined by X-ray crystallography and demonstrates that the substrate is present in a hydrazone tautomer conformation. We propose that the structure with balsalazide bound represents an enzyme intermediate and, together with the flavin mononucleotide binding cradle, we propose a novel catalytic mechanism.


    Organizational Affiliation

    Department of Pharmacology, University of Oxford, Mansfield Road, Oxford OX1 3QT, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
FMN-dependent NADH-azoreductase 1
A, B
212Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1)Mutation(s): 0 
Gene Names: azoR1
EC: 1.7.-.-
Find proteins for Q9I5F3 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Go to UniProtKB:  Q9I5F3
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FMN
Query on FMN

Download SDF File 
Download CCD File 
A, B
FLAVIN MONONUCLEOTIDE
RIBOFLAVIN MONOPHOSPHATE
C17 H21 N4 O9 P
FVTCRASFADXXNN-SCRDCRAPSA-N
 Ligand Interaction
GOL
Query on GOL

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Download CCD File 
A, B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
BLQ
Query on BLQ

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Download CCD File 
A
(3E)-3-({4-[(2-carboxyethyl)carbamoyl]phenyl}hydrazono)-6-oxocyclohexa-1,4-diene-1-carboxylic acid
balsalazide
C17 H15 N3 O6
KONZVQJABTUMFX-UDWIEESQSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.222 
  • R-Value Work: 0.154 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 83.097α = 90.00
b = 83.097β = 90.00
c = 109.050γ = 120.00
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
SCALAdata scaling
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-05-12
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance