Abstract
Ethanol grown Acetobacter aceti differed from acetate grown. In ethanol grown cells, acetate uptake, caused by the oxidation of acetate, was completely inhibited by ethanol, in acetate grown cells only to 20%. This was correlated with a 65-fold higher specific activity of the membrane bound NAD(P)-independent alcohol dehydrogenase in ethanol grown than in acetate grown cells. In comparison with ethanol grown cells, acetate grown cells showed a 3-fold higher acetate respiration rate and 3-fold higher specific activities of some tricarboxylic acid cycle enzymes tested. Both adaptations were due to induction by the homologous and not to repression by the heterologous growth substrate.
A. aceti showed a membrane bound NAD(P)-independent malate dehydrogenase and no activity of a soluble NAD(P)-dependent one, as was known before from A. xylinum. A hypothesis was proposed explaining the observed inhibition of malate dehydrogenase and of functioning of the tricarboxylic acid cycle in the presence of ethanol or butanol or glucose by a competition of two electron currents for a common link in the convergent electron transport chains. The electrons coming from the quinoproteins, alcohol dehydrogenase and glucose dehydrogenase on the one side and those coming from the flavoproteins, malate dehydrogenase and succinate dehydrogenase via ubiquinonecytochrome c reductase on the other side are meeting at cytochrome c. Here the quinoproteins may be favoured by higher affinity and so inhibit the flavoproteins. Inhibition could be alleviated in the cell free system by increasing the oxygen supply.
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Dedicated to Professor Carl Martius on the occasion of his 80th birthday, March 1st 1986
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Jucker, W., Ettlinger, L. The inhibition of acetate oxidation by ethanol in Acetobacter aceti . Arch. Microbiol. 143, 283–289 (1985). https://doi.org/10.1007/BF00411251
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DOI: https://doi.org/10.1007/BF00411251