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. 1981 Jan 1;193(1):99–107. doi: 10.1042/bj1930099

Production of superoxide radicals by soluble hydrogenase from Alcaligenes eutrophus H16.

K Schneider, H G Schlegel
PMCID: PMC1162581  PMID: 6272708

Abstract

The soluble hydrogenase (hydrogen-NAD+ oxidoreductase, EC 1.12.1.2) of Alcaligenes eutrophus H16 was shown to be stabilized by oxidation with oxygen and ferricyanide as long as electron donors and reducing compounds were absent. The simultaneous presence of H2, NADH and O2 in the enzyme solution, however, caused an irreversible inactivation of hydrogenase that was dependent on the O2 concentration. The half-life periods of 4 degrees C under partial pressures of 0.1, 5, 20 and 50% O2 were 11, 5, 2.5 and 1.5 h respectively. Evidence has been obtained that hydrogenase produces superoxide free radical anions (O2-.), which were detected by their ability to oxidize hydroxylamine to nitrite. The correlation between O2 concentration, nitrite formation and inactivation rates and the stabilization of hydrogenase by addition of superoxide dismutase indicated that superoxide radicals are responsible for enzyme inactivation. During short-term activity measurements (NAD+ reduction, H2 evolution from NADH), hydrogenase activity was inhibited by O2 only very slightly. In the presence of 0.7 mM-O2 an inhibition of about 20% was observed.

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Selected References

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