purine-nucleoside phosphorylase activity https://github.com/geneontology/go-ontology/issues/30193 GO:0004731 Catalysis of the reaction: purine nucleoside + phosphate = purine + alpha-D-ribose 1-phosphate. RHEA:19805 purine deoxynucleoside phosphorylase activity MetaCyc:PNP-RXN PUNPII purine deoxyribonucleoside phosphorylase activity purine ribonucleoside phosphorylase activity Reactome:R-HSA-9735775 inosine phosphorylase activity Reactome:R-HSA-112033 Reactome:R-HSA-112034 molecular_function EC:2.4.2.1 Reactome:R-HSA-74249 PNPase activity PUNPI Reactome:R-HSA-9755044 purine-nucleoside:phosphate ribosyltransferase activity purine nucleoside phosphorylase activity Reactome:R-HSA-9735789 inosine-guanosine phosphorylase activity Reactome:R-HSA-74242 pentosyltransferase activity