Deamination of 5'-substituted-2',3'-isopropylidene adenosine derivatives catalyzed by adenosine deaminase (ADA, EC 3.5.4.4) and complementary enzymatic biotransformations catalyzed by adenylate deaminase (AMPDA, EC 3.5.4.6) : a viable route for the preparation of 5 '-substituted inosine derivatives

Adenosine deaminase (ADA) catalyzes the deamination of 2',3'-isopropylidene adenosine and the corresponding 5'-amino derivative in a 3% dimethylsulfoxide aqueous solution. Whereas ADA is unable to convert other 5'-substituted derivatives (acetate, acetamido, azide), the enzyme adenylate deaminase (AMPDA) accepts all the above compounds as substrates for their biotransformation to the corresponding 5'-substituted inosine derivative