2BVH
Crystal structure of 6-hydoxy-D-nicotine oxidase from Arthrobacter nicotinovorans. Crystal Form 2 (P21)
Summary for 2BVH
| Entry DOI | 10.2210/pdb2bvh/pdb |
| Related | 2BVF 2BVG |
| Descriptor | 6-HYDROXY-D-NICOTINE OXIDASE, FLAVIN-ADENINE DINUCLEOTIDE (2 entities in total) |
| Functional Keywords | autoflavinylation, enantiomeric substrates, flavoenzymes, nicotine degradation, oxidase |
| Biological source | ARTHROBACTER NICOTINOVORANS |
| Total number of polymer chains | 4 |
| Total formula weight | 198814.50 |
| Authors | Koetter, J.W.A.,Schulz, G.E. (deposition date: 2005-06-28, release date: 2005-08-17, Last modification date: 2024-11-13) |
| Primary citation | Koetter, J.W.A.,Schulz, G.E. Crystal Structure of 6-Hydroxy-D-Nicotine Oxidase from Arthrobacter Nicotinovorans. J.Mol.Biol., 352:418-, 2005 Cited by 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: 16095622DOI: 10.1016/J.JMB.2005.07.041 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (2.9 Å) |
Structure validation
Download full validation report
