2bvf | pdb_00002bvf

CRYSTAL STRUCTURE OF 6-HYDOXY-D-NICOTINE OXIDASE FROM ARTHROBACTER NICOTINOVORANS. CRYSTAL FORM 3 (P1)

spinqualitylabelsall models 2bvf, resolution 1.92Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2bvf is a 2 chain structure with sequence from Arthrobacter nicotinovorans. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: FAD Related: 2bvg, 2bvh Activity: (R)-6-hydroxynicotine oxidase, with EC number 1.5.3.6 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 The crystal structure of 6-hydroxy-d-nicotine oxidase (EC 1.5.3.6) was solved by X-ray diffraction analysis in three crystal forms at resolutions up to 1.9 A. The enzyme is monomeric in solution and also in the mother liquor but formed disulfide-dimers in all crystals. It belongs to the p-cresol methylhydroxylase-vanillyl-alcohol oxidase family and contains an FAD covalently bound to the polypeptide. The covalent bond of this enzyme was the first for which a purely autocatalytic formation had been shown. In contrast to previous reports, the bond does not involve N(epsilon2) (N3) of His72 but the N(delta1) (N1) atom. The geometry of this reaction is proposed and the autoflavinylation is discussed in the light of homologous structures. The enzyme is specific for 6-hydroxy-D-nicotine and is inhibited by the L-enantiomer. This observation was verified by modeling enzyme-substrate and enzyme-inhibitor complexes, which also showed the geometry of the catalyzed reaction. The binding models indicated that the deprotonation of the substrate rather than the hydride transfer is the specificity-determining step. The functionally closely related 6-hydroxy-L-nicotine oxidase processing the L-enantiomer is sequence-related to the greater glutathione reductase family with quite a different chainfold. A model of this "sister enzyme" derived from known homologous structures suggests that the reported L-substrate specificity and D-enantiomer inhibition are also determined by the location of the deprotonating base. Crystal structure of 6-hydroxy-D-nicotine oxidase from Arthrobacter nicotinovorans.,Koetter JW, Schulz GE J Mol Biol. 2005 Sep 16;352(2):418-28. PMID:16095622 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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