IUBMB Enzyme Nomenclature


Accepted name: kaempferol 3-O-xylosyltransferase

Reaction: UDP-α-D-xylose + kaempferol = UDP + kaempferol 3-O-β-D-xyloside

For diagram of reaction, click here

Other name(s): F3XT; UDP-D-xylose:flavonol 3-O-xylosyltransferase; flavonol 3-O-xylosyltransferase

Systematic name: UDP-α-D-xylose:kaempferol 3-O-D-xylosyltransferase

Comments: The enzyme from the plant Euonymus alatus also catalyses the 3-O-D-xylosylation of other flavonols (e.g. quercetin, isorhamnetin, rhamnetin, myricetin, fisetin) with lower activity.

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, CAS registry number:


1. Ishikura, N. and Yang, Z.Q. UDP-D-xylose: flavonol 3-O-xylosyltransferase from young leaves of Euonymus alatus f. ciliato-dentatus. Z. Naturforsch. C: Biosci. 46 (1991) 1003-1010.

[EC created 2013]

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