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Peculiarities of C2 metabolism and intensification of the synthesis of surface-active substances in Rhodococcus erythropolis EK-1 grown in ethanol

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Abstract

Oxidation of ethanol, acetaldehyde, and acetate in Rhodococcus erythropolis EK-1, producer of surface-active substances (SAS), is catalyzed by N,N-dimethyl-4-nitrosoaniline (DMNA)-dependent alcohol dehydrogenase, NAD+/NADP+-dependent dehydrogenases (optimum pH 9.5), and acetate kinase/acetyl-CoA-synthetase, respectively. The glyoxylate cycle and complete tricarboxylic acid cycle function in the cells of R. erythropolis EK-1 growing on ethanol; the synthesis of phosphoenolpyruvate (PEP) is provided by the two key enzymes of gluconeogenesis, PEP carboxykinase and PEP synthetase. Introduction of citrate (0.1%) and fumarate (0.2%) into the cultivation medium of R. erythropolis EK-1 containing 2% ethanol resulted in the 1.5-and 3.5-fold increase in the activities of isocitrate lyase and PEP synthetase (the key enzymes of the glyoxylate cycle and gluconeogenesis branch of metabolism, respectively) and of lipid synthesis, as evidenced by the 1.5-fold decrease of isocitrate dehydrogenase activity. In the presence of fumarate and citrate, the indices of SAS synthesis by strain R. erythropolis EK-1 grown on ethanol increased by 40–100%.

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Authors and Affiliations

  1. Institute of Microbiology and Virology, National Academy of Sciences of Ukraine, ul. Zabolotnogo 154, Kiev, 03680, Ukraine

    T. P. Pirog, Yu. V. Korzh, T. A. Shevchuk & D. A. Tarasenko

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  1. T. P. Pirog
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  2. Yu. V. Korzh
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  3. T. A. Shevchuk
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  4. D. A. Tarasenko
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Correspondence to T. P. Pirog.

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Original Russian Text © T.P. Pirog, Yu.V. Korzh, T.A. Shevchuk, D.A. Tarasenko, 2008, published in Mikrobiologiya, 2008, Vol. 77, No. 6, pp. 749–757.

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Pirog, T.P., Korzh, Y.V., Shevchuk, T.A. et al. Peculiarities of C2 metabolism and intensification of the synthesis of surface-active substances in Rhodococcus erythropolis EK-1 grown in ethanol. Microbiology 77, 665–673 (2008). https://doi.org/10.1134/S0026261708060039

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