IUBMB Enzyme Nomenclature


Accepted name: flavonol-3-O-glycoside glucosyltransferase

Reaction: UDP-glucose + a flavonol 3-O-β-D-glucosyl-(1→2)-β-D-glucoside = UDP + a flavonol 3-O-β-D-glucosyl-(1→2)-β-D-glucosyl-(1→2)-β-D-glucoside

See diagram for reaction with 3-O-β-D-glucosyl-(1→2)-β-D-glucosides of kaempferol or quercetin.

Systematic name: UDP-glucose:flavonol-3-O-β-D-glucosyl-(1→2)-β-D-glucoside 2'''-O-β-D-glucosyltransferase

Comments: One of three specific glucosyltransferases in pea (Pisum sativum) that successively add a β-D-glucosyl group first to O-3 of kaempferol, and then to O-2 of the previously added glucosyl group giving the 3-O-sophoroside and then the 3-O-sophorotrioside (see also EC flavonol 3-O-glucosyltransferase, and EC flavonol-3-O-glucoside glucosyltransferase).

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


1. Jourdan, P.S. and Mansell, R.L. Isolation and partial characterization of three glucosyl transferases involved in the biosynthesis of flavonol triglucosides in Pisum sativum L. Arch. Biochem. Biophys. 213 (1982) 434-443. [PMID: 6462109]

[EC created 2004]

Return to EC 2.4.1 home page
Return to EC 2.4 home page
Return to EC 2 home page
Return to Enzymes home page
Return to IUBMB Biochemical Nomenclature home page