2BVH

Crystal structure of 6-hydoxy-D-nicotine oxidase from Arthrobacter nicotinovorans. Crystal Form 2 (P21)

2BVH の概要

• エントリーDOI: 10.2210/pdb2bvh/pdb
• 関連するPDBエントリー: 2BVF 2BVG
• 分子名称: 6-HYDROXY-D-NICOTINE OXIDASE, FLAVIN-ADENINE DINUCLEOTIDE (2 entities in total)
• 機能のキーワード: autoflavinylation, enantiomeric substrates, flavoenzymes, nicotine degradation, oxidase
• 由来する生物種: ARTHROBACTER NICOTINOVORANS
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 198814.50

構造登録者

Koetter, J.W.A.,Schulz, G.E. (登録日: 2005-06-28, 公開日: 2005-08-17, 最終更新日: 2024-11-13)

主引用文献

Koetter, J.W.A.,Schulz, G.E.
Crystal Structure of 6-Hydroxy-D-Nicotine Oxidase from Arthrobacter Nicotinovorans.
J.Mol.Biol., 352:418-, 2005

PubMed Abstract: 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.

PubMed: 16095622
DOI: 10.1016/J.JMB.2005.07.041

実験手法

X-RAY DIFFRACTION (2.9 Å)