<p>Phosphorylases in this entry include:</p><p> <ul><li>Purine nucleoside phosphorylase (<db_xref db="EC" dbkey="2.4.2.1"/>) (PNP) from most bacteria (gene deoD), which catalyses the cleavage of guanosine or inosine to respective bases and sugar-1-phosphate molecules [<cite idref="PUB00000763"/>].</li><li>Uridine phosphorylase (<db_xref db="EC" dbkey="2.4.2.3"/>) (UdRPase) from bacteria (gene udp) and mammals, which catalyses the cleavage of uridine into uracil and ribose-1-phosphate, the products of the reaction are used either as carbon and energy sources or in the rescue of pyrimidine bases for nucleotide synthesis [<cite idref="PUB00002902"/>].</li><li>5'-methylthioadenosine phosphorylase (<db_xref db="EC" dbkey="2.4.2.28"/>) (MTA phosphorylase) from <taxon tax_id="2287">Sulfolobus solfataricus</taxon> [<cite idref="PUB00002872"/>].</li><li>Purine nucleoside phosphorylase (<db_xref db="EC" dbkey="2.4.2.1"/>) (PNP) from mammals as well as from some bacteria (gene deoD). This enzyme catalyzes the cleavage of guanosine or inosine to respective bases and sugar-1-phosphate molecules [<cite idref="PUB00002584"/>].</li><li>5'-methylthioadenosine phosphorylase (<db_xref db="EC" dbkey="2.4.2.28"/>) (MTA phosphorylase) from eukaryotes [<cite idref="PUB00000256"/>].</li></ul> </p>