HPRT

Catalysis of the reaction: IMP + diphosphate = hypoxanthine + 5-phospho-alpha-D-ribose 1-diphosphate.

6-hydroxypurine phosphoribosyltransferase activity, 6-mercaptopurine phosphoribosyltransferase activity, HGPRTase activity, HPRT, IMP diphosphorylase activity, IMP pyrophosphorylase activity, IMP-GMP pyrophosphorylase activity, IMP:diphosphate phospho-D-ribosyltransferase activity, Transphosphoribosidase activity, guanine-hypoxanthine phosphoribosyltransferase activity, hypoxanthine phosphoribosyltransferase activity, hypoxanthine-guanine phosphoribosyltransferase activity, inosinate pyrophosphorylase activity, inosine 5'-phosphate pyrophosphorylase activity, inosinic acid pyrophosphorylase activity, inosinic pyrophosphorylase activity, purine-6-thiol phosphoribosyltransferase activity