Flavonol 3-O-glucosyltransferase
class of enzymes
Flavonol 3-O-glucosyltransferase (EC 2.4.1.91) is an enzyme that catalyzes the general chemical reaction
UDP-glucose + a flavonol
⇌
{\displaystyle \rightleftharpoons }
UDP + a flavonol 3-O-beta-D-glucoside
The two substrates of this enzyme are UDP-glucose and a flavonol. Its products are uridine diphosphate (UDP) and the corresponding flavonol 3-O-beta-D-glucoside. The flavonoids that can act as substrates within this reaction include quercetin, kaempferol, dihydrokaempferol, kaempferid, fisetin, and isorhamnetin. Flavonol 3-O-glucosyltransferase is a hexosyl group transfer enzyme.
This enzyme is known by the systematic name UPD-glucose:flavonol 3-O-D glucosyltransferase, and it participates in flavonoid biosynthesis and causes the formation of anthocyanins. Anthocyanins produce a purple color in the plant tissues that they are present in.
Occurrence
Flavonol 3-O-glucosyltransferase is found in grapes (Vitis vinifera), parsley, snapdragons (Antirrhinum majus), kale (Brassica oleracea), tulip bulbs, peony, and grapefruit (Citrus x paradisi).
Function
This enzyme is involved in the biosynthesis of secondary metabolites. The primary function of this enzyme within its pathway is binding a glucoside onto a flavonol molecule, forming a flavonol 3-O-glucoside. For example, it converts quercetin to isoquercetin:
A glucose unit is transferred from UDP-glucose to a specific hydroxy group of the flavonol, with uridine diphosphate (UDP) as a byproduct.
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This entry incorporates text from “Flavonol 3-O-glucosyltransferase” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.