ID 2.4.2.56 DE Kaempferol 3-O-xylosyltransferase. AN Flavonol 3-O-xylosyltransferase. CA UDP-alpha-D-xylose + kaempferol = UDP + kaempferol 3-O-beta-D-xyloside. CC -!- The enzyme from the plant Euonymus alatus also catalyzes the 3-O- CC D-xylosylation of other flavonols (e.g. quercetin, isorhamnetin, CC rhamnetin, myricetin, fisetin) with lower activity. //