Adenosine deaminase that may contribute to the degradation of extracellular adenosine, a signaling molecule that controls a variety of cellular responses. May play a role in the regulation of cell proliferation (By similarity). adenosine + H(+) + H2O = inosine + NH4(+) Binds 1 zinc ion per subunit. Belongs to the metallo-dependent hydrolases superfamily. Adenosine and AMP deaminases family. ADGF subfamily.