| xanthine phosphoribosyltransferase | |
| Ec Number: | 2.4.2.22 |
| Cas Number: | 9023-10-3 |
| Go Code: | 0000310 |
In enzymology, a xanthine phosphoribosyltransferase is an enzyme that catalyzes the chemical reaction
XMP + diphosphate
\rightleftharpoons
Thus, 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. The systematic name of this enzyme class is XMP:diphosphate 5-phospho-alpha-D-ribosyltransferase. Other names in common use include Xan phosphoribosyltransferase, xanthosine 5'-phosphate pyrophosphorylase, xanthylate pyrophosphorylase, xanthylic pyrophosphorylase, XMP pyrophosphorylase, 5-phospho-alpha-D-ribose-1-diphosphate:xanthine, phospho-D-ribosyltransferase, 9-(5-phospho-beta-D-ribosyl)xanthine:diphosphate, and 5-phospho-alpha-D-ribosyltransferase. This enzyme participates in purine metabolism.
As of late 2007, 6 structures have been solved for this class of enzymes, with PDB accession codes,,,,, and .