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In enzymology, a guanosine phosphorylase is an enzyme that catalyzes the chemical reaction
Thus, the two substrates of this enzyme are guanosine and phosphate, whereas its two products are guanine and alpha-D-ribose 1-phosphate.
This enzyme belongs to the family of glycosyltransferases, specifically the pentosyltransferases. The systematic name of this enzyme class is guanosine:phosphate alpha-D-ribosyltransferase. This enzyme participates in purine metabolism.
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