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Use of the valine biosynthetic pathway to convert glucose into isobutanol

  • Original Paper
  • Published:
Journal of Industrial Microbiology & Biotechnology

Abstract

Microbiological synthesis of higher alcohols (1-butanol, isobutanol, 2-methyl-1-butanol, etc.) from plant biomass is critically important due to their advantages over ethanol as a motor fuel. In recent years, the use of branched-chain amino acid (BCAA) biosynthesis pathways together with heterologous Ehrlich pathway enzyme system (Hazelwood et al. in Appl Environ Microbiol 74:2259–2266, 2008) has been proposed by the Liao group as an alternative approach to aerobic production of higher alcohols as new-generation biofuels (Atsumi et al. in Nature 451:86–90, 2008; Atsumi et al. in Appl Microbiol Biotechnol 85:651–657, 2010; Cann and Liao in Appl Microbiol Biotechnol 81:89–98, 2008; Connor and Liao in Appl Environ Microbiol 74:5769–5775, 2008; Shen and Liao in Metab Eng 10:312–320, 2008; Yan and Liao in J Ind Microbiol Biotechnol 36:471–479, 2009). On the basis of these remarkable investigations, we re-engineered Escherichia coli valine-producing strain H-81, which possess overexpressed ilvGMED operon, for the aerobic conversion of sugar into isobutanol. To redirect valine biosynthesis to the production of alcohol, we also—as has been demonstrated previously (Atsumi et al. in Nature 451:86–90, 2008; Atsumi et al. in Appl Microbiol Biotechnol 85:651–657, 2010; Cann and Liao in Appl Microbiol Biotechnol 81:89–98, 2008; Connor and Liao in Appl Environ Microbiol 74:5769–5775, 2008; Shen and Liao in Metab Eng 10:312–320, 2008; Yan and Liao in J Ind Microbiol Biotechnol 36:471–479, 2009)—used enzymes of Ehrlich pathway. In particular, in our study, the following heterologous proteins were exploited: branched-chain 2-keto acid decarboxylase (BCKAD) encoded by the kdcA gene from Lactococcus lactis with rare codons substituted, and alcohol dehydrogenase (ADH) encoded by the ADH2 gene from Saccharomyces cerevisiae. We show that expression of both of these genes in the valine-producing strain H-81 results in accumulation of isobutanol instead of valine. Expression of BCKAD alone also resulted in isobutanol accumulation in the culture broth, supporting earlier obtained data (Atsumi et al. in Appl Microbiol Biotechnol 85:651–657, 2010) that native ADHs of E. coli are also capable of isobutanol production. Thus, in this work, isobutanol synthesis by E. coli was achieved using enzymes similar to but somewhat different from those previously used.

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Authors and Affiliations

  1. Ajinomoto-Genetika Research Institute, 1-St Dorozhny Proezd, b.1-1, Moscow, 117545, Russia

    Ekaterina A. Savrasova, Aleksander D. Kivero & Nataliya V. Stoynova

  2. State Research Institute of Genetics and Selection of Industrial Microorganisms, 1-St Dorozhny Proezd, b.1, Moscow, 117545, Russia

    Rustem S. Shakulov

Authors
  1. Ekaterina A. Savrasova
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  2. Aleksander D. Kivero
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  3. Rustem S. Shakulov
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  4. Nataliya V. Stoynova
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Correspondence to Ekaterina A. Savrasova or Nataliya V. Stoynova.

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Savrasova, E.A., Kivero, A.D., Shakulov, R.S. et al. Use of the valine biosynthetic pathway to convert glucose into isobutanol. J Ind Microbiol Biotechnol 38, 1287–1294 (2011). https://doi.org/10.1007/s10295-010-0907-2

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  • DOI: https://doi.org/10.1007/s10295-010-0907-2

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