Improvement of fatty acid ethyl ester production by optimizing thioesterase expression / 生物工程学报

Biosynthesis of fatty acid ethyl ester (FAEE) by genetically engineered Escherichia coli has attracted extensive attentions from scientific community. In this study, we evaluated the effects of thioesterase with different origins on FAEE production and the results show that Cc FatB1 from Cinnamomum camphorum is better than tesA' from E. coli for FAEE production. Then, the optimized FAEE-producing strain KC4, with 21.4 mg/(L x OD600) FAEE production under flask condition and 31.16 mg/(L x OD600) under 5 L fermentation condition, was constructed by co-expression of Cc FatB1 and tesA'. Compared with the reported FAEE-producing strain KC3, KC4 possesses the higher FAEE productivity.