Flavone apiosyltransferase () is an enzyme that catalyzes the chemical reaction
The two substrates of this enzyme are the flavone, apigetrin, and UDP-apiose, which transfers its apiose sugar unit to one of the hydroxy groups in the glycosyl ring of the starting material to give apiin, with uridine diphosphate (UDP) as a byproduct.
This enzyme belongs to the family of glycosyltransferases, specifically the pentosyltransferases. The systematic name of this enzyme class is UDP-apiose:5,4'-dihydroxyflavone 7-O-beta-D-glucoside 2''-O-beta-D-apiofuranosyltransferase. Other names in common use include uridine diphosphoapiose-flavone apiosyltransferase, and UDP-apiose:7-O-(beta-D-glucosyl)-flavone apiosyltransferase.
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