Tags: Enzyme.
In enzymology a xanthine phosphoribosyltransferase (EC 2.4.2.22) is an enzyme that catalyzes the chemical reactionXMP + diphosphate 5-phospho-alpha-D-ribose 1-diphosphate + xanthineThus the two substrates of this enzyme are XMP and diphosphate whereas its two products are 5-phospho-alpha-D-ribose 1-diphosphate and xanthine.This enzyme belongs to the family of glycosyltransferases specifically the pentosyltransferases.