1yve | pdb_00001yve

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

spinqualitylabelsall models 1yve, resolution 1.65Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1yve is a 4 chain structure with sequence from Spinacia oleracea. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, HIO, MG, NDP Gene: CDNA FROM ACETOHYDROXY ACID (Spinacia oleracea) Activity: Ketol-acid reductoisomerase, with EC number 1.1.1.86 Resources: FirstGlance, OCA, RCSB, PDBsum Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed 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. 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 EMBO J. 1997 Jun 16;16(12):3405-15. PMID:9218783 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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