Flavonol-3-O-glycoside glucosyltransferase

Flavonol-3-O-glycoside glucosyltransferase
Identifiers
EC number	2.4.1.240
Databases
IntEnz	IntEnz view
BRENDA	BRENDA entry
ExPASy	NiceZyme view
KEGG	KEGG entry
MetaCyc	metabolic pathway
PRIAM	profile
PDB structures	RCSB PDB PDBe PDBsum
Search PMC articles PubMed articles NCBI proteins

In enzymology, a flavonol-3-O-glycoside glucosyltransferase (EC 2.4.1.240) is an enzyme that catalyzes the chemical reaction

UDP-glucose + a flavonol 3-O-beta-D-glucosyl-(1->2)-beta-D-glucoside $\rightleftharpoons$ UDP + a flavonol 3-O-beta-D-glucosyl-(1->2)-beta-D-glucosyl-(1->2)-beta-D-glucoside

Thus, the two substrates of this enzyme are UDP-glucose and [[flavonol 3-O-beta-D-glucosyl-(1->2)-beta-D-glucoside]], whereas its 3 products are UDP, flavonol, and [[3-O-beta-D-glucosyl-(1->2)-beta-D-glucosyl-(1->2)-beta-D-glucoside]].

This enzyme belongs to the family of glycosyltransferases, specifically the hexosyltransferases. The systematic name of this enzyme class is UDP-glucose:flavonol-3-O-beta-D-glucosyl-(1->2)-beta-D-glucoside 2-O-beta-D-glucosyltransferase.

References

• Jourdan PS, Mansell RL (1982). "Isolation and partial characterization of three glucosyl transferases involved in the biosynthesis of flavonol triglucosides in Pisum sativum L". Arch. Biochem. Biophys. 213 (2): 434–43. doi:10.1016/0003-9861(82)90569-0. PMID 6462109.