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Production of Flavonoid O-Glucoside Using Sucrose Synthase and Flavonoid O-Glucosyltransferase Fusion Protein

  • Son, Mi-Hyel (Department of Bioscience and Biotechnology, Bio/Molecular Informatics Center, Konkuk University) ;
  • Kim, Bong-Gyu (Department of Bioscience and Biotechnology, Bio/Molecular Informatics Center, Konkuk University) ;
  • Kim, Dae-Hwan (Department of Bioscience and Biotechnology, Bio/Molecular Informatics Center, Konkuk University, Gyeonggido Institute of Health and Environment) ;
  • Jin, Mi-Rim (Department of Bioscience and Biotechnology, Bio/Molecular Informatics Center, Konkuk University) ;
  • Kim, Kwang-Pyo (Department of Bioscience and Biotechnology, Bio/Molecular Informatics Center, Konkuk University) ;
  • Ahn, Joong-Hoon (Department of Bioscience and Biotechnology, Bio/Molecular Informatics Center, Konkuk University)
  • Published : 2009.07.31

Abstract

Enzymatic glucosylation with glycosyltransferases can be used to regulate the water solubility of aglycone. The drawback of this process is the demand of UDP-glucose as a sugar donor. We made an in-frame fusion of the flavonoid O-glucosyltransferase (OsUGT-3) and sucrose synthase (AtSUS) genes. The resulting fusion protein, OsUGT3-AtSUS, was expressed in E. coli and purified. When sucrose and UDP were supplied, the fusion protein was able to convert quercetin into quercetin O-glucoside without the addition of UDP-glucose. In addition, UDP-glucose was recycled when sucrose was added to the reaction mixture. This fusion protein is useful for the enzymatic production of flavonoid O-glucosides.

Keywords

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