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Synthetic Consortium of Escherichia coli for n-Butanol Production by Fermentation of the Glucose-Xylose Mixture.
Journal of Agricultural and Food Chemistry 2017 November 23
The microbial production of n-butanol using glucose and xylose, the major components of plant biomass, can provide a sustainable and renewable fuel as crude oil replacement. However, Escherichia coli prefers glucose to xylose as programmed by carbohydrate catabolite repression (CCR). In this study, a synthetic consortium consisting of two strains was developed by transforming the CCR-insensitive strain into a glucose-selective strain and a xylose-selective strain. Furthermore, the dual culture was reshaped by distribution of the synthetic pathway of n-butanol into two strains. Consequently, the co-culture system enabled effective co-utilization of both sugars and production of 5.2 g/L n-butanol at 30 h. The result leads to the conversion yield and productivity accounting for 63% of the theoretical yield and 0.17 g L-1 h-1 , respectively. Overall, the technology platform as proposed is useful for production of other value-added chemicals, which require complicated pathways for their synthesis by microbial fermentation of a sugar mixture.
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