DOI QR코드

DOI QR Code

Enzymatic Biotransformation of Ginsenoside Rb2 into Rd by Recombinant α-L-Arabinopyranosidase from Blastococcus saxobsidens

  • Kim, Ju-Hyeon (Department of Biotechnology, Hankyong National University) ;
  • Oh, Jung-Mi (Department of Physiology, Chonbuk National University Medical School) ;
  • Chun, Sungkun (Department of Physiology, Chonbuk National University Medical School) ;
  • Park, Hye Yoon (National Institute of Biological Resources) ;
  • Im, Wan Taek (Department of Biotechnology, Hankyong National University)
  • 투고 : 2019.10.29
  • 심사 : 2019.12.12
  • 발행 : 2020.03.28

초록

In this study, we used a novel α-L-arabinopyranosidase (AbpBs) obtained from ginsenoside-converting Blastococcus saxobsidens that was cloned and expressed in Escherichia coli BL21 (DE3), and then applied it in the biotransformation of ginsenoside Rb2 into Rd. The gene, termed AbpBs, consisting of 2,406 nucleotides (801 amino acid residues), and with a predicted translated protein molecular mass of 86.4 kDa, was cloned into a pGEX4T-1 vector. A BLAST search using the AbpBs amino acid sequence revealed significant homology with a family 2 glycoside hydrolase (GH2). The over-expressed recombinant AbpBs in Escherichia coli BL21 (DE3) catalyzed the hydrolysis of the arabinopyranose moiety attached to the C-20 position of ginsenoside Rb2 under optimal conditions (pH 7.0 and 40℃). Kinetic parameters for α-L-arabinopyranosidase showed apparent Km and Vmax values of 0.078 ± 0.0002 μM and 1.4 ± 0.1 μmol/min/mg of protein against p-nitrophenyl-α-L-arabinopyranoside. Using a purified AbpBs (1 ㎍/ml), 0.1% of ginsenoside Rb2 was completely converted to ginsenoside Rd within 1 h. The recombinant AbpBs could be useful for high-yield, rapid, and low-cost preparation of ginsenoside Rd from Rb2.

키워드

참고문헌

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피인용 문헌

  1. Diversity of Ginsenoside Profiles Produced by Various Processing Technologies vol.25, pp.19, 2020, https://doi.org/10.3390/molecules25194390
  2. Two Key Amino Acids Variant of α-l-arabinofuranosidase from Bacillus subtilis Str. 168 with Altered Activity for Selective Conversion Ginsenoside Rc to Rd vol.26, pp.6, 2021, https://doi.org/10.3390/molecules26061733
  3. Chryseobacterium panacisoli sp. nov., isolated from ginseng-cultivation soil with ginsenoside-converting activity vol.71, pp.11, 2020, https://doi.org/10.1099/ijsem.0.005086