- Source: Flavonol-3-O-triglucoside O-coumaroyltransferase
In enzymology, a 3/info/flavonol" target="_blank">flavonol-3-o" target="_blank">O-triglucoside o" target="_blank">O-coumaroyltransferase (EC 2.3.1.173) is an enzyme that catalyzes the chemical reaction
4-coumaroyl-CoA + a 3/info/flavonol" target="_blank">flavonol 3-o" target="_blank">O-[beta-D-glucosyl-(1->2)-beta-D-glucosyl-(1->2)-beta-D-glucoside]
⇌
{\displaystyle \rightleftharpoons }
CoA + a 3/info/flavonol" target="_blank">flavonol 3-o" target="_blank">O-[6-(4-coumaroyl)-beta-D-glucosyl-(1->2)-beta-D-glucosyl-(1->2)- beta-D-glucoside]
The 3 substrates of this enzyme are 4-coumaroyl-CoA, 3/info/flavonol" target="_blank">flavonol, and [[3-o" target="_blank">O-beta-D-glucosyl-(1->2)-beta-D-glucosyl-(1->2)-beta-D-glucoside]], whereas its 4 products are CoA, 3/info/flavonol" target="_blank">flavonol, [[3-o" target="_blank">O-[6-(4-coumaroyl)-beta-D-glucosyl-(1->2)-beta-D-glucosyl-(1->2)-]], and beta-D-glucoside].
This enzyme belongs to the family of transferases, to be specific those acyltransferases transferring groups other than aminoacyl groups. The systematic name of this enzyme class is 4-coumaroyl-CoA:3/info/flavonol" target="_blank">flavonol-3-o" target="_blank">O-[beta-D-glucosyl-(1->2)-beta-D-glucosid e] 6-o" target="_blank">O-4-coumaroyltransferase.
References
Saylor MH, Mansell RL (1977). "Hydroxycinnamoyl: coenzyme A transferase involved in the biosynthesis of kaempferol-3-(p-coumaroyl triglucoside) in Pisum sativum". Z. Naturforsch. C. 32 (9–10): 764–8. PMID 145116.