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Stepwise Synthesis of Quercetin Bisglycosides Using Engineered Escherichia coli

  • Choi, Gyu Sik (Department of Integrative Bioscience and Biotechnology, Bio/Molecular Informatics Center, Konkuk University) ;
  • Kim, Hyeon Jeong (Department of Integrative Bioscience and Biotechnology, Bio/Molecular Informatics Center, Konkuk University) ;
  • Kim, Eun Ji (Department of Integrative Bioscience and Biotechnology, Bio/Molecular Informatics Center, Konkuk University) ;
  • Lee, Su Jin (Department of Integrative Bioscience and Biotechnology, Bio/Molecular Informatics Center, Konkuk University) ;
  • Lee, Youngshim (Department of Integrative Bioscience and Biotechnology, Bio/Molecular Informatics Center, Konkuk University) ;
  • Ahn, Joong-Hoon (Department of Integrative Bioscience and Biotechnology, Bio/Molecular Informatics Center, Konkuk University)
  • Received : 2018.07.24
  • Accepted : 2018.09.13
  • Published : 2018.11.28

Abstract

Synthesis of flavonoid glycoside is difficult due to diverse hydroxy groups in flavonoids and sugars. As such, enzymatic synthesis or biotransformation is an approach to solve this problem. In this report, we used stepwise biotransformation to synthesize two quercetin bisglycosides (quercetin 3-O-glucuronic acid 7-O-rhamnoside [Q-GR] and quercetin 3-O-arabinose 7-O-rhamnoside [Q-AR]) because quercetin O-rhamnosides contain antiviral activity. Two sequential enzymatic reactions were required to synthesize these flavonoid glycosides. We first synthesized quercetin 3-O-glucuronic acid [Q-G], and quercetin 3-O-arabinose [Q-A] from quercetin using E. coli harboring specific uridine diphopsphate glycosyltransferase (UGT) and genes for UDP-glucuronic acid and UDP-arabinose, respectively. With each quercetin 3-O-glycoside, rhamnosylation using E. coli harboring UGT and the gene for UDP-rhamnose was conducted. This approach resulted in the production of 44.8 mg/l Q-GR and 45.1 mg/l Q-AR. This stepwise synthesis could be applicable to synthesize various natural product derivatives in case that the final yield of product was low due to the multistep reaction in one cell or when sequential synthesis is necessary in order to reduce the synthesis of byproducts.

Keywords

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