Catalyzes the deamination of adenosine to inosine at the wobble position 34 of tRNA(Arg2). adenosine(34) in tRNA + H(+) + H2O = inosine(34) in tRNA + NH4(+) Binds 1 zinc ion per subunit. Homodimer. Belongs to the cytidine and deoxycytidylate deaminase family.