Phosphoribosyltransferase domain-containing protein 1(PRTFDC1) is a member of the purine/pyrimidine phosphoribosyltransferase family. PRTFDC1 has a low, barely measurable phosphoribosyltransferase activity(in vitro). PRTFDC1 can bind GMP, IMP and alpha-D-5-phosphoribosyl 1-pyrophosphate(PRPP). PRTFDC1 is not expected to impact purine metabolism or GMP salvage.