2c29 | pdb_00002c29

Structure of dihydroflavonol reductase from Vitis vinifera at 1.8 A.

spinqualitylabelsall models 2c29, resolution 1.81Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2c29 is a 2 chain structure with sequence from Grape. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: DQH, NAP Activity: Dihydrokaempferol 4-reductase, with EC number 1.1.1.219 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT 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 The nicotinamide adenine dinucleotide phosphate (NADPH)-dependent enzyme dihydroflavonol 4-reductase (DFR) catalyzes a late step in the biosynthesis of anthocyanins and condensed tannins, two flavonoid classes of importance to plant survival and human nutrition. This enzyme has been widely investigated in many plant species, but little is known about its structural and biochemical properties. To provide a basis for detailed structure-function studies, the crystal structure of Vitis vinifera DFR, heterologously expressed in Escherichia coli, has been determined at 1.8 A resolution. The 3D structure of the ternary complex obtained with the oxidized form of nicotinamide adenine dinucleotide phosphate and dihydroquercetin, one of the DFR substrates, presents common features with the short-chain dehydrogenase/reductase family, i.e., an N-terminal domain adopting a Rossmann fold and a variable C-terminal domain, which participates in substrate binding. The structure confirms the importance of the 131-156 region, which lines the substrate binding site and enlightens the role of a specific residue at position 133 (Asn or Asp), assumed to control substrate recognition. The activity of the wild-type enzyme and its variant N133D has been quantified in vitro, using dihydroquercetin or dihydrokaempferol. Our results demonstrate that position 133 cannot be solely responsible for the recognition of the B-ring hydroxylation pattern of dihydroflavonols. Crystal structure of grape dihydroflavonol 4-reductase, a key enzyme in flavonoid biosynthesis.,Petit P, Granier T, d'Estaintot BL, Manigand C, Bathany K, Schmitter JM, Lauvergeat V, Hamdi S, Gallois B J Mol Biol. 2007 May 18;368(5):1345-57. Epub 2007 Mar 6. PMID:17395203 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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