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 
  • R-Value Observed: 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
  • Primary Citation of Related Structures:  
    1YVE

  • 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 pathway ...

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ACETOHYDROXY ACID ISOMEROREDUCTASE IJKL524Spinacia oleraceaMutation(s): 0 
Gene Names: CDNA FROM ACETOHYDROXY ACIDAHRI
EC: 1.1.1.86
Find proteins for Q01292 (Spinacia oleracea)
Explore Q01292 
Go to UniProtKB:  Q01292
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NDP
Query on NDP

Download Ideal Coordinates CCD File 
I, K, L
NADPH DIHYDRO-NICOTINAMIDE-ADENINE-DINUCLEOTIDE PHOSPHATE
C21 H30 N7 O17 P3
ACFIXJIJDZMPPO-NNYOXOHSSA-N
 Ligand Interaction
HIO
Query on HIO

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

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

Download Ideal Coordinates CCD File 
I, J, K, L
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-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 
  • R-Value Observed: 0.197 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 111.43α = 90
b = 61.94β = 95.08
c = 162.54γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

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