Journal of Ginseng Research

The Korean Society of Ginseng (고려인삼학회)
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Journal of Ginseng ResearchHighly regioselective biotransformation of ginsenoside Rb2 into compound Y and compound K by β-glycosidase purified from Armillaria mellea mycelia

  • Kim, Min-Ji (Department of Food Science and Technology, Chonbuk National University) ;
  • Upadhyaya, Jitendra (Department of Food Science and Technology, Chonbuk National University) ;
  • Yoon, Min-Sun (Department of Food Science and Biotechnology, Chonbuk National University) ;
  • Ryu, Nam Soo (Department of Food Science and Biotechnology, Chonbuk National University) ;
  • Song, Young Eun (Jeollabuk-do Agricultural Research and Extension Services) ;
  • Park, Hee-Won (Korea Ginseng Corporation Research Institute, Korea Ginseng Corporation) ;
  • Kim, Young-Hoi (Department of Food Science and Technology, Chonbuk National University) ;
  • Kim, Myung-Kon (Department of Food Science and Technology, Chonbuk National University)
  • Received : 2017.01.16
  • Accepted : 2017.07.03
  • Published : 2018.10.15
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Abstract

Background: The biological activities of ginseng saponins (ginsenosides) are associated with type, number, and position of sugar moieties linked to aglycone skeletons. Deglycosylated minor ginsenosides are known to be more biologically active than major ginsenosides. Accordingly, the deglycosylation of major ginsenosides can provide the multibioactive effects of ginsenosides. The purpose of this study was to transform ginsenoside Rb2, one of the protopanaxadiol-type major ginsenosides, into minor ginsenosides using ${\beta}$-glycosidase (BG-1) purified from Armillaria mellea mycelium. Methods: Ginsenoside Rb2 was hydrolyzed by using BG-1; the hydrolytic properties of Rb2 by BG-1 were also characterized. In addition, the influence of reaction conditions such as reaction time, pH, and temperature, and transformation pathways of Rb2, Rd, F2, compound O (C-O), and C-Y by treatment with BG-1 were investigated. Results: BG-1 first hydrolyzes 3-O-outer ${\beta}$-$\text\tiny{D}$-glucoside of Rb2, then 3-O-${\beta}$-$\text\tiny{D}$-glucoside of C-O into C-Y. C-Y was gradually converted into C-K with a prolonged reaction time, but the pathway of Rb2 ${\rightarrow}$ Rd ${\rightarrow}$ F2 ${\rightarrow}$ C-K was not observed. The optimum reaction conditions for C-Y and C-K formation from Rb2 by BG-1 were pH 4.0-4.5, temperature $45-60^{\circ}C$, and reaction time 72-96 h. Conclusion: ${\beta}$-Glycosidase purified from A. mellea mycelium can be efficiently used to transform Rb2 into C-Y and C-K. To our best knowledge, this is the first result of transformation from Rb2 into C-Y and C-K by basidiomycete mushroom enzyme.

Keywords

References

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