Purine nucleoside phosphorylase

Purine nucleoside phosphorylase also known as PNPase and inosine phosphorylase is an enzyme that in humans is encoded by the NP gene.

In enzymology, a purine-nucleoside phosphorylase (EC2.4.2.1) is an enzyme that catalyzes the chemical reaction

Thus, the two substrates of this enzyme are purine nucleoside and phosphate, whereas its two products are purine and alpha-D-ribose 1-phosphate.