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 language | English |
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Article number | 123386 |
Journal | Bioresource technology |
Volume | 309 |
DOIs | |
Publication status | Published - 2020 Aug |
Bibliographical note
Funding Information:This research was supported by the National Research Foundation (NRF) of South Korea funded by the Korean Government (2012M1A2A2026560 and 2018M3A9F3079643).
Funding Information:
This research was supported by the National Research Foundation (NRF) of South Korea funded by the Korean Government ( 2012M1A2A2026560 and 2018M3A9F3079643 ).
Publisher Copyright:
© 2020 Elsevier Ltd
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