Abstract
The effect of fumarate (C4-dicarboxylic acid, a gluconeogenesis precursor) and citrate (a lipid synthesis regulator) on the production of surfactants by Acinetobacter calcoaceticus K-4 grown on ethanol has been studied. Simultaneous addition of fumarate and citrate to concentrations of 0.01–0.02% at the end of the exponential phase of K-4 growth in a medium with 2 vol % ethanol increases the conditional surfactant concentration by 45–55% in comparison with indices in medium without organic acids. The increased level of surfactant production in the presence of fumarate and citrate is determined by the increase in the activities of enzymes involved in the production of glycolipids (phosphoenolpyruvate synthase and trehalose phosphate synthase) and aminolipids (NADP+-dependent glutamate dehydrogenase) in of 1.7–7 times, as well as by the simultaneous functioning of two anaplerotic pathways: the glyoxylate cycle and the reaction catalyzed by phosphoenolpyruvate carboxylase.
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Original Russian Text © T.P. Pirog, T.A. Shevchuk, A.D. Konon, E.Yu. Dolotenko, 2012, published in Prikladnaya Biokhimiya i Mikrobiologiya, 2012, Vol. 48, No. 6, pp. 631–639.
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Pirog, T.P., Shevchuk, T.A., Konon, A.D. et al. Production of surfactants by Acinetobacter calcoaceticus K-4 grown on ethanol with organic acids. Appl Biochem Microbiol 48, 569–576 (2012). https://doi.org/10.1134/S0003683812040102
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DOI: https://doi.org/10.1134/S0003683812040102