title: Peroxide reductase activity of NADH dehydrogenase of an alkaliphilic Bacillus in the presence of a 22-kDa protein component from Amphibacillus xylanus.
abstract: The NADH oxidase of Amphibacillus xylanus shows high NADH-peroxide reductase activity for hydrogen peroxide and alkyl hydroperoxides in the presence of a 22-kDa disulfide-containing protein component (Y. Niimura, L. B. Poole, and V. Massey, J. Biol.Chem. 270, 25645-25650, 1995). It was found that the membrane-bound NADH dehydrogenase of an alkaliphilic Bacillus (YN-1) involved in the respiratory chain also exhibits reductase activity for hydrogen peroxide and cumene hydroperoxide in the presence of the 22-kDa component from Amphibacillus xylanus. Vmax values for these substrates were as high as those of the NADH oxidase of A. xylanus. Although the 38-kDa protein produced by trypsin treatment of NADH dehydrogenase retains NADH dehydrogenase activity, it exhibited no peroxide reductase activity in the presence of the 22-kDa component from A. xylanus. The NADH dehydrogenase of YN-1 might not only catalyze electron flow from NADH to the respiratory chain, but also function for scavenging peroxide.
authors.affiliation: Department of Chemistry, Faculty of Science, Chiba University, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Koyama
authors.forename: T
authors.initials: T
authors.lastname: Koitabashi
authors.forename: Y
authors.initials: Y
authors.lastname: Niimura
authors.forename: V
authors.initials: V
authors.lastname: Massey
mesh_terms: D001407:Bacillus / Q000201:enzymology*; D001426:Bacterial Proteins / Q000737:chemistry*; D001555:Benzene Derivatives / Q000378:metabolism; D004579:Electron Transport / Q000502:physiology; D005182:Flavin-Adenine Dinucleotide / Q000494:pharmacology; D016166:Free Radical Scavengers / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000378:metabolism; D007700:Kinetics; D009243:NAD / Q000378:metabolism; D009245:NADH Dehydrogenase / Q000378:metabolism*; D010088:Oxidoreductases / Q000378:metabolism*; D010544:Peroxidases / Q000378:metabolism*; D014357:Trypsin / Q000378:metabolism
chemical_list: D001426:Bacterial Proteins; D001555:Benzene Derivatives; D016166:Free Radical Scavengers; D009243:NAD; D005182:Flavin-Adenine Dinucleotide; D006861:Hydrogen Peroxide; D010088:Oxidoreductases; D010544:Peroxidases; D009245:NADH Dehydrogenase; D014357:Trypsin; C007164:cumene hydroperoxide