title: Production of the rare ginsenosides compound K, compound Y, and compound Mc by a thermostable beta-glycosidase from Sulfolobus acidocaldarius.
abstract: The rare ginsenosides compound K, compound Y, and compound Mc were produced from the major ginsenosides Rb(1), Rb(2), Rc, and Rd by a thermostable beta-glycosidase from Sulfolobus acidocaldarius via three pathways: Rb(1)-->Rd-->compound K, Rb(2)-->compound Y-->compound K, and Rc-->compound Mc. Each of the ginsenosides was identified by high-performance liquid chromatography using standards and liquid chromatography-mass spectrometry based on their molecular weights. The catalytic efficiency of the enzyme for ginsenosides followed the order Rb(1) (4.8)>Rc (4.5)>Rd (1.0)>Rb(2) (0.77 mM(-1) min(-1)). The enzyme converted 1 mg/ml reagent-grade Rb(1), Rb(2), and Rc to 0.53 mg/ml compound K, 0.56 mg/ml compound Y, and 0.70 mg/ml compound Mc, respectively, at pH 5.5 and 85 degrees C after 180 min, corresponding to mole conversion yields of 94, 80, and 100% (mol/mol), respectively. The enzyme converted the major ginsenosides Rb(1), Rb(2), Rc, and Rd in 10% (w/v) ginseng root extract to the rare ginsenosides with a mole yield of 99% after 24 h. These results suggest that beta-glycosidase from S. acidocaldarius can be used to produce compound K, compound Y, and compound Mc.
authors.affiliation: Department of Bioscience and Biotechnology, Konkuk University, 1 Hwayang-dong, Gwangjin-gu, Seoul 143-701, Republic of Korea.
authors.forename: Kyeong-Hwan
authors.initials: KH
authors.lastname: Noh
authors.forename: Deok-Kun
authors.initials: DK
authors.lastname: Oh
mesh_terms: D001483:Base Sequence; D001711:Biotransformation; D002851:Chromatography, High Pressure Liquid; D003001:Cloning, Molecular; D017931:DNA Primers; D004795:Enzyme Stability; D036145:Ginsenosides / Q000096:biosynthesis*; D006868:Hydrolysis; D007700:Kinetics; D005894:Panax / Q000378:metabolism; D018517:Plant Roots / Q000378:metabolism; D016945:Sulfolobus acidocaldarius / Q000201:enzymology*; D001617:beta-Glucosidase / Q000235:genetics / Q000378:metabolism*
chemical_list: D017931:DNA Primers; D036145:Ginsenosides; D001617:beta-Glucosidase