pA simple, rapid and inexpensive method is described for the enzymic synthesis of [alpha-32P]ATP from [32P]Pi on a preparative scale with an overall yield of 53%. The final product contained all of the detectable radioactivity (less than 99.9%) in the alpha position and has been shown to behave identically with commerically availabe [alpha-32P]ATP during the synthesis of 3′:5′-cyclic AMP in the reaction catalysed by adenylate cyclase./p
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