Converts guanine to guanosine monophosphate, and hypoxanthine to inosine monophosphate. Transfers the 5-phosphoribosyl group from 5-phosphoribosylpyrophosphate onto the purine. Plays a central role in the generation of purine nucleotides through the purine salvage pathway.
[1] "Isolation and characterization of a full-length expressible cDNA for human hypoxanthine phosphoribosyl transferase."Jolly D.J., Okayama H., Berg P., Esty A.C., Filpula D., Bohlen P., Johnson G.G., Shively J.E., Hunkapillar T., Friedmann T