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Enzymes involved in adenosine metabolism. (1) 5′-methylthioadenosine/S-adenosylhomocysteine nucleosidase (not present in human cells) or 5′-methylthioadenosine phosphorylase; (2) adenine phosphoribosyl transferase; (3) adenosine kinase; (4) adenosine phosphorylases (not present in human cells) and most bacterial purine nucleoside phosphorylases; (5) adenosine deaminase; (6) purine nucleoside phosphorylase; (7) hypoxanthine/guanine phosphoribosyl transferase.
