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The inhibition of acetate oxidation by ethanol in Acetobacter aceti (1985)

Jucker, Walter ; Ettlinger, Leopold

Springer

Archives of microbiology 143 (1985), S. 283-289

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ISSN: 1432-072X

Keywords: Acetobacter aceti ; Overoxidation ; Metabolic regulation ; Electron transport ; Quinoproteins

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: 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.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00411251

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Stoffwechselprodukte von Actinomyceten, XVI. Cinerubine (1959)

Ettlinger, Leopold ; Gäumann, Ernst ; Hütter, Ralf ; [et al.]

Weinheim : Wiley-Blackwell

Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1867-1879

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ISSN: 0009-2940

Keywords: Chemistry ; Inorganic Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Die von verschiedenen Streptomyces-Arten gleichzeitig gebildeten roten Antibiotica Cinerubin A und B geben bei der sauren Hydrolyse drei Zucker und ein Aglykon C22H20O9. Für das letztere wurde auf Grund physikalischer Eigenschaften und chemischer Reaktionen die Teilformel I abgeleitet. Das Aglykon der Cinerubine ist mit dem inzwischen von H. Brockmann und Mitarbb. isolierten und in seiner Konstitution aufgeklärten ∊-Pyrromycinon identisch.Wir danken Herrn Professor H. Brockmann für die freundliche Mitteilung seiner unveröffentlichten Ergebnisse. Einer von uns (V. P) hatte weiter die Gelegenheit, am 6. Oktober 1958, im Rahmen des Sommerkurses über die Chemie der Naturstoffe in Varenna, einen ausführlichen Vortrag von Professor Brockmann über die Chemie der Pyrromycinone zu hören. Bei diesem Anlaß wurde beschlossen, die Ergebnisse der beiden Forschungsgruppen gleichzeitig zu veröffentlichen (vgl. S. 1880, 1904 dieses Heftes)..

Additional Material: 2 Tab.