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pubmed-article:35231pubmed:abstractTextA method has been developed for the enzymatic preparation of alpha-(32)P-labeled ribo- and deoxyribonucleoside triphosphates, cyclic [(32)P]AMP, and cyclic [(32)P]GMP of high specific radioactivity and in high yield from (32)Pi. The method also enables the preparation of [gamma-(32)P]ATP, [gamma-(32)P]GTP, [gamma-(32)P]ITP, and [gamma-(32)P]-dATP of very high specific activity and in high yield. The preparation of the various [alpha-(32)P]nucleoside triphosphates relies on the phosphorylation of the respective 3'-nucleoside monophosphates with [gamma-(32)P]ATP by polynucleotide kinase and a subsequent nuclease reaction to form [5'-(32)P]nucleoside monophosphates. The [5'-(32)P]nucleoside monophosphates are then converted enzymatically to the respective triphosphates. All of the reactions leading to the formation of [alpha-(32)P]nucleoside triphosphates are carried out in the same reaction vessel, without intermediate purification steps, by the use of sequential reactions with the respective enzymes. Cyclic [(32)P]AMP and cyclic [(32)P]GMP are also prepared enzymatically from [alpha-(32)P]ATP or [alpha-(32)P]GTP by partially purified preparations of adenylate or guanylate cyclases. With the exception of the cyclases, all enzymes used are commerically available. The specific activity of (32)P-labeled ATP made by this method ranged from 200 to 1000 Ci/mmol for [alpha-(32)P]ATP and from 5800 to 6500 Ci/mmol for [gamma-(32)P]ATP. Minor modifications of the method should permit higher specific activities, especially for the [alpha-(32)P]nucleoside triphosphates. Methods for the use of the [alpha-(32)P]nucleoside phosphates are described for the study of adenylate and guanylate cyclases, cyclic AMP- and cyclic GMP phosphodiesterase, cyclic nucleotide binding proteins, and as precursors for the synthesis of other (32)P-labeled compounds of biological interest. Moreover, the [alpha-(32)P]nucleoside triphosphates prepared by this method should be very useful in studies on nucleic acid structure and metabolism and the [gamma-(32)P]nucleoside triphosphates should be useful in the study of phosphate transfer systems.lld:pubmed
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pubmed-article:35231pubmed:articleTitleThe enzymatic preparation of [alpha-(32)P]nucleoside triphosphates, cyclic [32P] AMP, and cyclic [32P] GMP.lld:pubmed
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pubmed-article:35231pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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