Bioprocess and Biosystems Engineering

, Volume 35, Issue 9, pp 1467–1475

Isobutanol production in engineered Saccharomyces cerevisiae by overexpression of 2-ketoisovalerate decarboxylase and valine biosynthetic enzymes

Original Paper

DOI: 10.1007/s00449-012-0736-y

Cite this article as:
Lee, WH., Seo, SO., Bae, YH. et al. Bioprocess Biosyst Eng (2012) 35: 1467. doi:10.1007/s00449-012-0736-y

Abstract

Engineering of Saccharomyces cerevisiae to produce advanced biofuels such as isobutanol has received much attention because this yeast has a natural capacity to produce higher alcohols. In this study, construction of isobutanol production systems was attempted by overexpression of effective 2-keto acid decarboxylase (KDC) and combinatorial overexpression of valine biosynthetic enzymes in S. cerevisiae D452-2. Among the six putative KDC enzymes from various microorganisms, 2-ketoisovalerate decarboxylase (Kivd) from L. lactis subsp. lactis KACC 13877 was identified as the most suitable KDC for isobutanol production in the yeast. Isobutanol production by the engineered S. cerevisiae was assessed in micro-aerobic batch fermentations using glucose as a sole carbon source. 93 mg/L isobutanol was produced in the Kivd overexpressing strain, which corresponds to a fourfold improvement as compared with the control strain. Isobutanol production was further enhanced to 151 mg/L by additional overexpression of acetolactate synthase (Ilv2p), acetohydroxyacid reductoisomerase (Ilv5p), and dihydroxyacid dehydratase (Ilv3p) in the cytosol.

Keywords

Isobutanol Engineered Saccharomyces cerevisiae 2-Ketoisovalerate decarboxylase Valine biosynthetic enzymes 

Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  1. 1.Department of Food Science and Human NutritionUniversity of Illinois at Urbana-ChampaignUrbanaUSA
  2. 2.Institute for Genomic BiologyUniversity of Illinois at Urbana-ChampaignUrbanaUSA
  3. 3.Department of Agricultural Biotechnology, Center for Agricultural BiomaterialsSeoul National UniversitySeoulKorea

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