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ginsenoside Rb1 glucohydrolase
Ginsenosidases catalyse the hydrolysis of glycosyl moieties attached to the C-3, C-6 or C-20 position of ginsenosides. They are specific with respect to the nature of the glycosidic linkage, the position and the order in which the linkages are cleaved. Ginsenoside Rb1 beta-glucosidase specifically and sequentially hydrolyses the 20-[beta-D-glucopyranosyl-(1->6)-beta-D glucopyranosyloxy] residues attached to position 20 by first hydrolysing the (1->6)-glucosidic bond to generate ginsenoside Rd as an intermediate, followed by hydrolysis of the remaining 20-O-beta-D-glucosidic bond.
no hydrolysis of the 20-O-alpha-D-(1->6)-arabinopyranosidic bond of ginsenoside Rb2 and the 20-O-beta-D-(1->6)-xylosidic bond of ginsenoside Rb3. It does not hydrolyse the 3-O-beta-glucosidic bond of ginsenoside Rb1, Rb2, Rb3