Abstract
This work describes the production of (R,R)-2,3-butanediol in Escherichia coli using glycerol by metabolic engineering approaches. The introduction of a synthetic pathway converting pyruvate to (R,R)-2,3-butanediol into wild-type E. coli strain BW25113 led to the production of (R,R)-2,3-butanediol at a titer of 3.54 g/l and a yield of 0.131 g product/g glycerol (26.7 % of theoretical maximum) with acetate (around 3.00 g/l) as the dominant by-product. We therefore evaluated the impacts of deleting the genes ackA or/and poxB that are responsible for the major by-product, acetate. This increased production of (R,R)-2,3-butanediol to 9.54 g/l with a yield of 0.333 g product/g glycerol (68.0 % of theoretical maximum) in shake flask studies. The utilization of low-priced crude glycerol to produce value-added chemicals is of great significance to the economic viability of the biodiesel industry.
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Acknowledgments
The authors acknowledge the support of the National Science Foundation of China (20976009, 21176018) and the National High-tech Research and Development Program of China (2009AA02Z202). Xiaolin Shen is supported financially by the Key Laboratory of Bioprocess of Beijing at Beijing University of Chemical Technology. This work was also partially supported by start-up funds from the Faculty of Engineering, University of Georgia, Athens.
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Shen, X., Lin, Y., Jain, R. et al. Inhibition of acetate accumulation leads to enhanced production of (R,R)-2,3-butanediol from glycerol in Escherichia coli . J Ind Microbiol Biotechnol 39, 1725–1729 (2012). https://doi.org/10.1007/s10295-012-1171-4
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DOI: https://doi.org/10.1007/s10295-012-1171-4