Reaction: 4-coumaroyl-CoA + a flavonol 3-O-[β-D-glucosyl-(1→2)-β-D-glucosyl-(1→2)-β-D-glucoside] = CoA + a flavonol 3-O-[6-(4-coumaroyl)-β-D-glucosyl-(1→2)-β-D-glucosyl-(1→2)-β-D-glucoside]
For diagram click here.
Other name(s): 4-coumaroyl-CoA:flavonol-3-O-[β-D-glucosyl-(1→2)-β-D-glucoside] 6′′′-O-4-coumaroyltransferase (incorrect); 4-coumaroyl-CoA:flavonol 3-O-[β-D-glucosyl-(1→2)-β-D-glucosyl-(1→2)-β-D-glucoside] 6′′′-O-4-coumaroyltransferase
Systematic name: 4-coumaroyl-CoA:flavonol 3-O-(β-D-glucosyl-1,2-β-D-glucosyl-1,2-β-D-glucoside) 6'''-O-4-coumaroyltransferase
Comments: Acylates kaempferol 3-O-triglucoside on the terminal glucosyl unit, almost certainly at C-6.
Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number: 64972-79-8
1. Saylor, M.H. and Mansell, R.L. Hydroxycinnamoyl:coenzyme A transferase involved in the biosynthesis of kaempferol-3-(p-coumaroyl triglucoside) in Pisum sativum. Z. Naturforsch. [C] 32 (1977) 765-768. [PMID: 145116]