Purine nucleoside phosphorylase (PNP), from calf spleen, human erythrocytes and E. coli have been examined with regard to structural requirements of substrates and inhibitors. Kinetic parameters (Km, Vmax/Km) for a variety of N(1) and/or N(7)-methylated analogues of guanosine, inosine and adenosine have been evaluated for all three enzymes.
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