Tags: Enzyme.
In enzymology a purine-nucleoside phosphorylase (EC 2.4.2.1) is an enzyme that catalyzes the chemical reactionpurine nucleoside + phosphate purine + alpha-D-ribose 1-phosphateThus the two substrates of this enzyme are purine nucleoside and phosphate whereas its two products are purine and alpha-D-ribose 1-phosphate.This enzyme belongs to the family of glycosyltransferases specifically the pentosyltransferases.