Abstract
Anaerobic biosynthesis of 1-butanol from glucose is investigated in recombinant Escherichia coli strains which form butyryl-CoA using the heterologous enzyme complex of clostridia or as a result of a reversal in the action of native enzymes of the fatty acid β-oxidation pathway. It was revealed that when the basic pathways of acetic and lactic acid formation are inactivated due to deletions of the ackA, pta, poxB, and ldhA genes, the efficiency of butyryl-CoA biosynthesis and its reduced product, i.e., 1-butanol, by two types of recombinant stains is comparable. The limiting factor for 1-butanol production by the obtained strains is the low substrate specificity of the basic CoA-dependent alcohol/aldehyde dehydrogenase AdhE from E. coli to butyryl-CoA. It was concluded that, in order to construct an efficient 1-butanol producer based on a model strain synthesizing butyryl-CoA as a result of reversed action of fatty acid β-oxidation enzymes, it is necessary to provide intensive formation of acetyl-CoA and enhanced activity of alternative alcohol and aldehyde dehydrogenases in the cells of a strain.
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Original Russian Text © A.Yu. Gulevich, A.Yu. Skorokhodova, A.A. Morzhakova, S.V. Antonova, A.V. Sukhozhenko, R.S. Shakulov, V.G. Debabov, 2012, published in Prikladnaya Biokhimiya i Mikrobiologiya, 2012, Vol. 48, No. 4, pp. 383–388.
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Gulevich, A.Y., Skorokhodova, A.Y., Morzhakova, A.A. et al. 1-Butanol synthesis by Escherichia coli cells through butyryl-CoA formation by heterologous enzymes of clostridia and native enzymes of fatty acid β-oxidation. Appl Biochem Microbiol 48, 344–349 (2012). https://doi.org/10.1134/S0003683812040060
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DOI: https://doi.org/10.1134/S0003683812040060