KEGG   ENZYME: 2.4.1.239Help
Entry
EC 2.4.1.239                Enzyme                                 

Name
flavonol-3-O-glucoside glucosyltransferase;
UDP-glucose:flavonol-3-O-glucoside 2''-O-beta-D-glucosyltransferase
Class
Transferases;
Glycosyltransferases;
Hexosyltransferases
BRITE hierarchy
Sysname
UDP-glucose:flavonol-3-O-beta-D-glucoside 2''-O-beta-D-glucosyltransferase
Reaction(IUBMB)
UDP-glucose + a flavonol 3-O-beta-D-glucoside = UDP + a flavonol 3-O-beta-D-glucosyl-(1->2)-beta-D-glucoside [RN:R07339]
Reaction(KEGG)
Substrate
UDP-glucose [CPD:C00029];
flavonol 3-O-beta-D-glucoside [CPD:C03946]
Product
UDP [CPD:C00015];
flavonol 3-O-beta-D-glucosyl-(1->2)-beta-D-glucoside [CPD:C15581]
Comment
One of three specific glucosyltransferases in pea (Pisum sativum) that successively add a beta-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.
History
EC 2.4.1.239 created 2004
Pathway
Flavone and flavonol biosynthesis
Reference
1  [PMID:6462109]
  Authors
Jourdan PS, Mansell RL.
  Title
Isolation and partial characterization of three glucosyl transferases involved in the biosynthesis of flavonol triglucosides in Pisum sativum L.
  Journal
Arch. Biochem. Biophys. 213 (1982) 434-43.
Other DBs
ExplorEnz - The Enzyme Database: 
IUBMB Enzyme Nomenclature: 
ExPASy - ENZYME nomenclature database: 
BRENDA, the Enzyme Database: 

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