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purine-nucleoside phosphorylase, family 1 (deoD) Purine nucleoside phosphorylase (also called inosine phosphorylase) is a purine salvage enzyme. Purine nucleosides, such as guanosine, inosine, or xanthosine, plus orthophosphate, can be converted to their respective purine bases (guanine, hypoxanthine, or xanthine) plus ribose-1-phosphate. This family of purine nucleoside phosphorylase is restricted to the bacteria. [Purines, pyrimidines, nucleosides, and nucleotides, Salvage of nucleosides and nucleotides]
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