1YVE

ACETOHYDROXY ACID ISOMEROREDUCTASE COMPLEXED WITH NADPH, MAGNESIUM AND INHIBITOR IPOHA (N-HYDROXY-N-ISOPROPYLOXAMATE)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.197 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The crystal structure of plant acetohydroxy acid isomeroreductase complexed with NADPH, two magnesium ions and a herbicidal transition state analog determined at 1.65 A resolution.

Biou, V.Dumas, R.Cohen-Addad, C.Douce, R.Job, D.Pebay-Peyroula, E.

(1997) EMBO J. 16: 3405-3415

  • DOI: 10.1093/emboj/16.12.3405
  • Also Cited By: 1QMG

  • PubMed Abstract: 
  • Acetohydroxy acid isomeroreductase catalyzes the conversion of acetohydroxy acids into dihydroxy valerates. This reaction is the second in the synthetic pathway of the essential branched side chain amino acids valine and isoleucine. Because this path ...

    Acetohydroxy acid isomeroreductase catalyzes the conversion of acetohydroxy acids into dihydroxy valerates. This reaction is the second in the synthetic pathway of the essential branched side chain amino acids valine and isoleucine. Because this pathway is absent from animals, the enzymes involved in it are good targets for a systematic search for herbicides. The crystal structure of acetohydroxy acid isomeroreductase complexed with cofactor NADPH, Mg2+ ions and a competitive inhibitor with herbicidal activity, N-hydroxy-N-isopropyloxamate, was solved to 1.65 A resolution and refined to an R factor of 18.7% and an R free of 22.9%. The asymmetric unit shows two functional dimers related by non-crystallographic symmetry. The active site, nested at the interface between the NADPH-binding domain and the all-helical C-terminus domain, shows a situation analogous to the transition state. It contains two Mg2+ ions interacting with the inhibitor molecule and bridged by the carboxylate moiety of an aspartate residue. The inhibitor-binding site is well adjusted to it, with a hydrophobic pocket and a polar region. Only 24 amino acids are conserved among known acetohydroxy acid isomeroreductase sequences and all of these are located around the active site. Finally, a 140 amino acid region, present in plants but absent from other species, was found to make up most of the dimerization domain.


    Related Citations: 
    • Crystallization and Preliminary Crystallographic Data for Acetohydroxy Acid Isomeroreductase from Spinacia Oleracea
      Dumas, R.,Job, D.,Douce, R.,Pebay-Peyroula, E.,Cohen-Addad, C.
      (1994) J.Mol.Biol. 242: 578


    Organizational Affiliation

    Unité Mixte CNRS/Rhône-Poulenc (UMR41), Rhône-Poulenc Agrochimie, Lyon, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ACETOHYDROXY ACID ISOMEROREDUCTASE
I, J, K, L
524Spinacia oleraceaMutation(s): 0 
Gene Names: AHRI
EC: 1.1.1.86
Find proteins for Q01292 (Spinacia oleracea)
Go to UniProtKB:  Q01292
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
I, J, K
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
I, J, K, L
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
HIO
Query on HIO

Download SDF File 
Download CCD File 
I, J, K, L
N-HYDROXY-N-ISOPROPYLOXAMIC ACID
C5 H9 N O4
QVIOSGUKMDGWNN-UHFFFAOYSA-N
 Ligand Interaction
NDP
Query on NDP

Download SDF File 
Download CCD File 
I, K, L
NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H30 N7 O17 P3
ACFIXJIJDZMPPO-NNYOXOHSSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.197 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 111.430α = 90.00
b = 61.940β = 95.08
c = 162.540γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
X-PLORmodel building
SCALEPACKdata scaling
X-PLORphasing
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-09-04
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance