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Physiological regulation of the properties of alcohol dehydrogenase II (ADH II) of Zymomonas mobilis: NADH renders ADH II resistant to cyanide and aeration

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Abstract

The variable cyanide-sensitivity of the iron-containing alcohol dehydrogenase isoenzyme (ADH II) of the ethanol-producing bacterium Zymomonas mobilis was studied. In aerobically grown permeabilized cells, cyanide caused gradual inhibition of ADH II, which was largely prevented by externally added NADH. Cyanide-sensitivity of ADH II was highest in cells grown under conditions of vigorous aeration, in which intracellular NADH concentration was low. Anaerobically grown bacteria, as well as those cultivated aerobically in the presence of cyanide, maintained higher intracellular NADH levels along with a more cyanide-resistant ADH II. It was demonstrated that cyanide acted as a competitive inhibitor of ADH II, competing with nicotinamide nucleotides. NADH increased both cyanide-resistance and oxygen-resistance of ADH II.

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Acknowledgements

This work was supported by the grant 01.0401 of the Latvian Council of Science. We are grateful to Professor Robert K. Poole for stimulating discussions and support.

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  1. Institute of Microbiology and Biotechnology, University of Latvia, Kronvalda boulv. 4, 1586, Riga, Latvia

    Uldis Kalnenieks, Nina Galinina & Malda M. Toma

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  1. Uldis Kalnenieks
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  2. Nina Galinina
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  3. Malda M. Toma
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Correspondence to Uldis Kalnenieks.

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Kalnenieks, U., Galinina, N. & Toma, M.M. Physiological regulation of the properties of alcohol dehydrogenase II (ADH II) of Zymomonas mobilis: NADH renders ADH II resistant to cyanide and aeration. Arch Microbiol 183, 450–456 (2005). https://doi.org/10.1007/s00203-005-0023-2

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  • DOI: https://doi.org/10.1007/s00203-005-0023-2

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