Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Biotransformation of Major Ginsenoside Rb1 toRd by Dekkera anomala YAE-1 from Mongolian Fermented Milk (Airag)

  • Renchinkhand, Gereltuya (Department of Animal Biosystem Science, College of Agriculture and Life Sciences, Chungnam National University) ;
  • Cho, Soo-Hyun (Department of Pharmacology Science, College of Pharmacology, Chungnam National University) ;
  • Park, Young W. (Agricultural Research Station, Fort Valley State University) ;
  • Song, Gyu-Yong (Department of Pharmacology Science, College of Pharmacology, Chungnam National University) ;
  • Nam, Myoung Soo (Department of Animal Biosystem Science, College of Agriculture and Life Sciences, Chungnam National University)
  • Received : 2020.04.10
  • Accepted : 2020.08.12
  • Published : 2020.10.28
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Abstract

Dekkera anomala YAE-1 strain separated from "airag" (Mongolian fermented mare's milk) produces β-glucosidase, which can convert ginsenoside Rb1 from Panax ginseng. Ginseng- derived bioactive components such as ginsenoside Rb1 have various immunological and anticancer activities. Airag was collected from five different mare milk farms located near Ulaanbaatar, Mongolia. YAE-1 strains were isolated from airag to examine the hydrolytic activities of β-glucosidase on Korean Panax ginseng using an API ZYM kit. Supernatants of selected cultures having β-glucosidase activity were examined for hydrolysis of the major ginsenoside Rb1 at 40℃, pH 5.0. The YAE-1 strain was found to be nearly identical at 99.9% homology with Dekkera anomala DB-7B, and was thus named Dekkera anomala YAE-1. This strain exerted higher β-glucosidase activity than other enzymes. Reaction mixtures from Dekkera anomala YAE-1 showed great capacity for converting ginsenoside Rb1 to ginsenoside Rd. The β-glucosidase produced by Dekkera anomala YAE-1 was able to hydrolyze ginsenoside Rb1 and convert it to Rd during fermentation of the ginseng. The amount of ginsenoside Rd was highly increased from 0 to 1.404 mg/ml in fermented 20% ginseng root at 7 days.

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