Biotechnology Bulletin ›› 2017, Vol. 33 ›› Issue (1): 129-134.doi: 10.13560/j.cnki.biotech.bull.1985.2017.01.014

• Orignal Article • Previous Articles     Next Articles

Biosynthesis of Valerena-4,7(11)-diene in an Engineered Escherichia coli Strain

LIU Chang, YIN Hua, ZHUANG Yi-bin, LIU Tao   

  1. Tianjin Institute of Industrial Biotechnology,Chinese Academy of Sciences,Tianjin 300308
  • Received:2016-10-10 Online:2017-01-25 Published:2017-01-19

Abstract: Valerena-4,7(11)-diene is a bicyclic sesquiterpene and shows particularly profound sedative,stress reducing and anxiolytic effects,and it could be used to treat attention deficit hyperactivity disorder(ADHD)and other mental illness. To achieve the de novo biosynthesis of valerena-4,7(11)-diene in Escherichia coli,eight genes of Saccharomyces cerevisiae involved in converting acetyl-CoA into farnesyl diphosphate(FPP)from mevalonate pathway and the valerena-4,7(11)-diene synthase(VoTPS)gene from Valeriana officinalis were co-overexpressed in BL21(DE3). Adopting the bipolar fermentation method of water phase and organic phase,the valerian-4,7(11)-diene was detected in organic phase by GC-MS,indicating that the synthesis of valerian-4,7(11)-diene was achieved initially in theE. coli. After primarily optimizing the IPTG concentration,the temperature of protein induction and choice of varied organic phases,the fermentation conditions were determined as follows:protein induced temperature was 20℃,the concentration of IPTG was 0.1 mmol/L,and organic phase was dodecane.

Key words: Escherichia coli, valerian-4,7(11)-diene, biosynthesis, valerian-4,7(11)-diene synthase(VoTPS)