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. 1993 May;175(10):2980–2987. doi: 10.1128/jb.175.10.2980-2987.1993

Purification and characterization of NADH oxidase from Serpulina (Treponema) hyodysenteriae.

T B Stanton 1, N S Jensen 1
PMCID: PMC204616  PMID: 8491717

Abstract

NADH oxidase (EC 1.6.99.3) was purified from cell lysates of Serpulina (Treponema) hyodysenteriae B204 by differential ultracentrifugation, ammonium sulfate precipitation, and chromatography on anion-exchange, dye-ligand-affinity, and size-exclusion columns. Purified NADH oxidase had a specific activity 119-fold higher than that of cell lysates and migrated as a single band during denaturing gel electrophoresis (sodium dodecyl sulfate-polyacrylamide gel electrophoresis [SDS-PAGE]). The enzyme was a monomeric protein with an estimated molecular mass of 47 to 48 kDa, as determined by SDS-PAGE and size-exclusion chromatography. Optimum enzyme activity occurred in buffers with a pH between 5.5 and 7.0. In the presence of oxygen, beta-NADH but not alpha-NADH, alpha-NADPH, or beta-NADPH was rapidly oxidized by the enzyme (Km = 10 microM beta-NADH; Vmax = 110 mumol beta-NADH min-1 mg of protein-1). Oxygen was the only identified electron acceptor for the enzyme. On isoelectric focusing gels, the enzyme separated into three subforms, with isoelectric pH values of 5.25, 5.35, and 5.45. Purified NADH oxidase had a typical flavoprotein absorption spectrum, with peak absorbances at wavelengths of 274, 376, and 448 nm. Flavin adenine dinucleotide was identified as a cofactor and was noncovalently associated with the enzyme at a molar ratio of 1:1. Assays of the enzyme after various chemical treatments indicated that a flavin cofactor and a sulfhydryl group(s), but not a metal cofactor, were essential for activity. Hydrogen peroxide and superoxide were not yielded in significant amounts by the S. hyodysenteriae NADH oxidase, indirect evidence that the enzyme produces water from reduction of oxygen with NADH. The N-terminal amino acid sequence of the NADH oxidase was determined to be MKVIVIGCHGAGTWAAK. In its biochemical properties, the NADH oxidase of S. hyodysenteriae resembles the NADH oxidase of another intestinal bacterium, Enterococcus faecalis.

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Selected References

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