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Volume 154, Issue 3

NADH dehydrogenase deficiency results in low respiration rate and improved aerobic growth of Free

Abstract

The respiratory chain of the ethanol-producing bacterium is able to oxidize both species of nicotinamide cofactors, NADH and NADPH. A mutant strain with a chloramphenicol-resistance determinant inserted in (encoding an NADH : CoQ oxidoreductase of type II) lacked the membrane NADH and NADPH oxidase activities, while its respiratory -lactate oxidase activity was increased. Cells of the mutant strain showed a very low respiration rate with glucose and no respiration with ethanol. The aerobic growth rate of the mutant was elevated; exponential growth persisted longer, resulting in higher biomass densities. For the parent strain a similar effect of aerobic growth stimulation was achieved previously in the presence of submillimolar cyanide concentrations. It is concluded (i) that the respiratory chain of contains only one functional NAD(P)H dehydrogenase, product of the gene, and (ii) that inhibition of respiration, whether resulting from a mutation or from inhibitor action, stimulates aerobic growth due to redirection of the NADH flux from respiration to ethanol synthesis, thus minimizing accumulation of toxic intermediates by contributing to the reduction of acetaldehyde to ethanol.

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2008-03-01
2024-05-04
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NADH dehydrogenase deficiency results in low respiration rate and improved aerobic growth of Zymomonas mobilis
Microbiology 154, 989 (2008); https://doi.org/10.1099/mic.0.2007/012682-0
/content/journal/micro/10.1099/mic.0.2007/012682-0
/content/journal/micro/10.1099/mic.0.2007/012682-0
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