Improved 2,3-butanediol yield and productivity from lignocellulose biomass hydrolysate in metabolically engineered Enterobacter aerogenes

Duck Gyun Kim, Seok Woo Yoo, Minsun Kim, Ja Kyong Ko, Youngsoon Um, Min Kyu Oh

Research output: Contribution to journalArticle

Abstract

We previously engineered Enterobacter aerogenes for glucose and xylose co-utilization and 2,3-butanediol production. Here, strain EMY-22 was further engineered to improve the 2,3-butanediol titer, productivity, and yield by reducing the production of byproducts. To reduce succinate production, the budABC operon and galP gene were overexpressed, which increased 2,3-butanediol production. For further reduction of succinate and 2-ketogluconate production, maeA was selected and overexpressed in EMY-22. The optimally engineered strain produced 2,3-butanediol for a longer time and showed reduced byproduct formation from sugarcane bagasse hydrolysate under flask cultivation conditions. The engineered strain displayed 66.6, 13.4, and 16.8% improvements in titer, yield, productivity of 2,3-butanediol, respectively, compared to its parental strain under fed-batch fermentation conditions. The data demonstrate that the metabolic engineering to reduce byproduct formation is a promising strategy to improve 2,3-butanediol production from lignocellulosic biomass.

Original languageEnglish
Article number123386
JournalBioresource technology
Volume309
DOIs
Publication statusPublished - 2020 Aug

Keywords

  • 2,3-butanediol
  • Enterobacter aerogenes
  • Lignocellulosic biomass
  • Metabolic engineering

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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