Apr 1, 1981

In vivo inactivation of soluble hydrogenase of Alcaligenes eutrophus

Archives of Microbiology
M Schlesier, Bärbel Friedrich

Abstract

The soluble, NAD+-reducing hydrogenase in intact cells of Alcaligenes eutrophus was inactivated by oxygen when electron donors such as hydrogen or pyruvate were available. The sole presence of either oxygen or oxidizable substrates did not lead to inactivation of the enzyme. Inactivation occurred similarly under autotrophic growth conditions with hydrogen, oxygen and carbon dioxide. The inactivation followed first order reaction kinetics, and the half-life of the enzyme in cells exposed to a gas atmosphere of hydrogen and oxygen (8:2, v/v) at 30 degrees C was 1.5h. The process of inactivation did not require ATP-synthesis. There was no experimental evidence that the inactivation is a reversible process catalyzed by a regulatory protein. The possibility is discussed that the inactivation is due to superoxide radical anions (O2-) produced by the hydrogenase itself.

Mentioned in this Paper

Dinitrophenols
Dioxygen
Hydrogenase
Oxidase
Isocyanides
Myopathy
Sodium Azide
Alcaligenes
Carbon Dioxide
Striadyne

About this Paper

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