KEGG   ENZYME: 2.4.1.240
Entry
EC 2.4.1.240                Enzyme                                 
Name
flavonol-3-O-glycoside glucosyltransferase
Class
Transferases;
Glycosyltransferases;
Hexosyltransferases
Sysname
UDP-glucose:flavonol-3-O-beta-D-glucosyl-(1->2)-beta-D-glucoside 2'''-O-beta-D-glucosyltransferase
Reaction(IUBMB)
UDP-glucose + a flavonol 3-O-beta-D-glucosyl-(1->2)-beta-D-glucoside = UDP + a flavonol 3-O-beta-D-glucosyl-(1->2)-beta-D-glucosyl-(1->2)-beta-D-glucoside [RN:R07340]
Reaction(KEGG)
R07340 > R06805 R06813
Substrate
UDP-glucose [CPD:C00029];
flavonol 3-O-beta-D-glucosyl-(1->2)-beta-D-glucoside [CPD:C15581]
Product
UDP [CPD:C00015];
flavonol 3-O-beta-D-glucosyl-(1->2)-beta-D-glucosyl-(1->2)-beta-D-glucoside [CPD:C15582]
Comment
One of three specific glucosyltransferases in pea (Pisum sativum) thatsuccessively 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 2.4.1.239 flavonol-3-O-glucoside glucosyltransferase).
History
EC 2.4.1.240 created 2004
Pathway
ec00944  Flavone and flavonol biosynthesis
ec01110  Biosynthesis of secondary metabolites
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 213:434-43 (1982)
DOI:10.1016/0003-9861(82)90569-0
Other DBs
ExplorEnz - The Enzyme Database: 2.4.1.240
IUBMB Enzyme Nomenclature: 2.4.1.240
ExPASy - ENZYME nomenclature database: 2.4.1.240
BRENDA, the Enzyme Database: 2.4.1.240
LinkDB

KEGG   REACTION: R06813
Entry
R06813                      Reaction                               
Name
UDP-glucose:flavonol-3-O-beta-D-glucosyl-(1->2)-beta-D-glucoside 2'''-O-beta-D-glucosyltransferase
Definition
Quercetin 3-O-beta-D-glucosyl-(1->2)-beta-D-glucoside + UDP-glucose <=> Quercetin 3-sophorotrioside + UDP
Equation
C12667 + C00029 <=> C12668 + C00015
Comment
flavonol-3-O-glycoside glucosyltransferase
Reaction class
RC00005  C00015_C00029
RC00049  C12667_C12668
Enzyme
2.4.1.240
Pathway
rn00944  Flavone and flavonol biosynthesis
Brite
Enzymatic reactions [BR:br08201]
 2. Transferase reactions
  2.4  Glycosyltransferases
   2.4.1  Hexosyltransferases
    2.4.1.240
     R06813  Quercetin 3-O-beta-D-glucosyl-(1->2)-beta-D-glucoside + UDP-glucose <=> Quercetin 3-sophorotrioside + UDP
IUBMB reaction hierarchy [BR:br08202]
 2. Transferase reactions
  2.4.1.240
   R07340  Flavonol 3-O-beta-D-glucosyl-(1->2)-beta-D-glucoside <=> Flavonol 3-O-beta-D-glucosyl-(1->2)-beta-D-glucosyl-(1->2)-beta-D-glucoside
    R06813  Quercetin 3-O-beta-D-glucosyl-(1->2)-beta-D-glucoside <=> Quercetin 3-sophorotrioside
LinkDB

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