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Metabolic engineering of Enterobacter aerogenes to improve the production of 2,3-butanediol
- Thapa, Laxmi Prasad, Lee, Sang Jun, Park, Chulhwan, Kim, Seung Wook
- Biochemical engineering journal 2019 v.143 pp. 169-178
- Enterobacter aerogenes, acetaldehyde dehydrogenase, acetates, acetyltransferases, batch fermentation, bioreactors, ethanol, genes, lactate dehydrogenase, lactic acid, malate dehydrogenase, metabolic engineering, phosphates
- The enhanced production of 2,3-butanediol was investigated using a metabolic engineering approach and optimized fermentation conditions. New engineered strains of Enterobacter aerogenes ATCC 29007 were developed by deleting the d-lactate dehydrogenase (ldhA), phosphate acetyltransferase (pta), malate dehydrogenase (mdh), and acetaldehyde dehydrogenase (acdh) genes to block the production of lactate, acetate, succinate, and ethanol, respectively. The resulting engineered strain E. aerogenes SUMI02 (ΔldhAΔpta) produced 36.5 g/L of 2,3-butanediol in flask cultivation, an amount 8.11 times greater than that of its wild type counterpart (4.5 g/L). In addition, the 2,3-butanediol production and productivity reached 38.24 g/L and 0.8 g/L/h, respectively, in the batch fermentation using a bioreactor.