The Enzyme Database

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EC 2.4.1.239     
Accepted name: flavonol-3-O-glucoside glucosyltransferase
Reaction: UDP-glucose + a flavonol 3-O-β-D-glucoside = UDP + a flavonol 3-O-β-D-glucosyl-(1→2)-β-D-glucoside
For diagram of kaempferol-glycoside biosynthesis, click here and for diagram of the biosynthesis of quercetin 3-O-triglucoside, click here
Other name(s): UDP-glucose:flavonol-3-O-glucoside 2′′-O-β-D-glucosyltransferase
Systematic name: UDP-glucose:flavonol-3-O-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 2.4.1.91, flavonol 3-O-glucosyltransferase and EC 2.4.1.240, flavonol-3-O-glycoside glucosyltransferase). TDP-glucose can replace UDP-glucose as the glucose donor but the reaction proceeds more slowly.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
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 2.4.1.239 created 2004]
 
 


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