| EC |
2.4.1.239 |
| Accepted name: |
flavonol-3-O-glucoside glucosyltransferase |
| Reaction: |
UDP-glucose + a flavonol 3-O-β-D-glucoside = UDP + a flavonol 3-O-β-D-glucosyl-(1→2)-β-D-glucoside |
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For diagram of kaempferol-glycoside biosynthesis, click here and for diagram of the biosynthesis of quercetin 3-O-triglucoside, click here |
| Other name(s): |
UDP-glucose:flavonol-3-O-glucoside 2′′-O-β-D-glucosyltransferase |
| Systematic name: |
UDP-glucose:flavonol-3-O-β-D-glucoside 2′′-O-β-D-glucosyltransferase |
| Comments: |
One of three specific glucosyltransferases in pea (Pisum sativum) that successively add a β-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. |
| Links to other databases: |
BRENDA, EXPASY, KEGG, MetaCyc |
| References: |
| 1. |
Jourdan, P.S. and Mansell, R.L. Isolation and partial characterization of three glucosyl transferases involved in the biosynthesis of flavonol triglucosides in Pisum sativum L. Arch. Biochem. Biophys. 213 (1982) 434–443. [DOI] [PMID: 6462109] |
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| [EC 2.4.1.239 created 2004] |
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