IUBMB Enzyme Nomenclature


Accepted name: dioscin glycosidase (3-O-β-D-Glc-diosgenin-forming)

Reaction: 3-O-[α-L-Rha-(1→4)-[α-L-Rha-(1→2)]-β-D-Glc]diosgenin + 2 H2O = 2 L-rhamnopyranose + diosgenin 3-O-β-D-glucopyranoside

Glossary: 3-O-[α-L-Rha-(1→4)-[α-L-Rha-(1→2)]-β-D-Glc]diosgenin = (3β,25R)-spirost-5-en-3-yl 6-deoxy-α-L-mannopyranosyl-(1→2)-[6-deoxy-α-L-mannopyranosyl-(1→4)]-β-D-glucopyranoside = dioscin
diosgenin = (3β,25R)-spirost-5-en-3-ol

Other name(s): dioscin-α-L-rhamnosidase

Systematic name: 3-O-[α-L-Rha-(1→4)-[α-L-Rha-(1→2)]-β-D-Glc]diosgenin (3-O-β-D-Glc-diosgenin-forming)

Comments: The enzyme is involved in the hydrolysis of the steroid saponin dioscin by the digestive system of Sus scrofa (pig). cf. EC, dioscin glycosidase (diosgenin-forming).

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:


1. Qian, S., Yu, H., Zhang, C., Lu, M., Wang, H. and Jin, F. Purification and characterization of dioscin-α-L-rhamnosidase from pig liver. Chem Pharm Bull (Tokyo) 53 (2005) 911-914. [PMID: 16079518]

[EC created 2013]

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