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• W2106029612 endingPage "5051" @default.
• W2106029612 startingPage "5046" @default.
• W2106029612 abstract "ABSTRACT The Amphibacillus xylanus NADH oxidase, which catalyzes the reduction of oxygen to hydrogen peroxide with β-NADH, can also reduce hydrogen peroxide to water in the presence of free flavin adenine dinucleotide (FAD) or the small disulfide-containing Salmonella enterica AhpC protein. The enzyme has two disulfide bonds, Cys128-Cys131 and Cys337-Cys340, which can act as redox centers in addition to the enzyme-bound FAD (K. Ohnishi, Y. Niimura, M. Hidaka, H. Masaki, H. Suzuki, T. Uozumi, and T. Nishino, J. Biol. Chem. 270:5812–5817, 1995). The NADH-FAD reductase activity was directly dependent on the FAD concentration, with a second-order rate constant of approximately 2.0 × 10 6 M −1 s −1 . Rapid-reaction studies showed that the reduction of free flavin occurred through enzyme-bound FAD, which was reduced by NADH. The peroxidase activity of NADH oxidase in the presence of FAD resulted from reduction of peroxide by free FADH 2 reduced via enzyme-bound FAD. This peroxidase activity was markedly decreased in the presence of oxygen, since the free FADH 2 is easily oxidized by oxygen, indicating that this enzyme system is unlikely to be functional in aerobic growing cells. The A. xylanus ahpC gene was cloned and overexpressed in Escherichia coli . When the NADH oxidase was coupled with A. xylanus AhpC, the peroxidase activity was not inhibited by oxygen. The V max values for hydrogen peroxide and cumene hydroperoxide reduction were both approximately 150 s −1 . The K m values for hydrogen peroxide and cumene hydroperoxide were too low to allow accurate determination of their values. Both AhpC and NADH oxidase were induced under aerobic conditions, a clear indication that these proteins are involved in the removal of peroxides under aerobic growing conditions." @default.
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• W2106029612 date "2000-09-15" @default.
• W2106029612 modified "2023-10-03" @default.
• W2106029612 title "A Hydrogen Peroxide-Forming NADH Oxidase That Functions as an Alkyl Hydroperoxide Reductase in <i>Amphibacillus xylanus</i>" @default.
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• W2106029612 doi "https://doi.org/10.1128/jb.182.18.5046-5051.2000" @default.
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