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Study on aerobic biosynthesis of 4-hydroxybutyric acid by Escherichia coli cells upon heterologous expression of the 2-ketoglutarate decarboxylase gene

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Abstract

The Mycobacterium tuberculosis Rv1248c (kgd) gene has been expressed in the recombinant Escherichia coli strain with the inactivated pathways of mixed-acid fermentation and anaerobic generation of acetyl-CoA, and also with modified system of glucose transport and phosphorylation, and altered regulation of ydfG gene encoding NADPH-dependent dehydrogenase of hydroxy carboxylic acids. It was found that with the intensive 2-ketoglutarate formation during aerobic glucose utilization, 4-hydroxybutyrate synthesis could be resulted not only from the direct conversion of 2-ketoglutarate to succinate semialdehyde by the heterologous enzymatic activity, but also from the involvement of respective tricarboxylic acid cycle intermediate in a cascade of native biochemical reactions. Induced expression of the 2-ketoglutarate decarboxylase gene in the recombinant strain provided an efficient conversion of 2-ketoglutarate to succinate semialdehyde derivatives, while the concentration of synthesized 4-hydroxybutyric acid reached 0.3 mM and has apparently been limited by the activity of the enzyme responsible for the terminal stage of precursor reduction.

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Abbreviations

GHB:

4-hydroxybutyric acid

HPLC:

high-performance liquid chromatography

GBL:

γ-butyrolactone

IPTG:

isopropyl β-D-l-thiogalactopyranoside

PCR:

polymerase chain reaction

SSA:

succinate semialdehyde

TCA:

tricarboxylic acid cycle

NADPH:

reduced form of nicotinamide adenine dinucleotide phosphate

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Correspondence to A. Yu. Gulevich.

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Original Russian Text © A.Yu. Gulevich, M.S. Skonechny, A.V. Sukhozhenko, A.Yu. Skorokhodova, V.G. Debabov, 2015, published in Biotekhnologiya, 2015, No. 2, pp. 46–54.

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Gulevich, A.Y., Skonechny, M.S., Sukhozhenko, A.V. et al. Study on aerobic biosynthesis of 4-hydroxybutyric acid by Escherichia coli cells upon heterologous expression of the 2-ketoglutarate decarboxylase gene. Appl Biochem Microbiol 51, 804–811 (2015). https://doi.org/10.1134/S0003683815080037

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