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pubmed-article:6346945pubmed:abstractTextA method for the synthesis and purification of guanosine 5'-[gamma-S]triphosphate labeled with 32P in the beta-position is described. The first step in the synthesis involves the quantitative transfer of 32Pi from [gamma-32P]dATP to 5'-GMP catalyzed by GMP kinase. Further incubation of the beta-32P]GDP product with [gamma-S]GTP and nucleoside diphosphate kinase results in the synthesis of [beta-32P][gamma-S]GTP with a yield of 10 to 18%. The 32P-labeled [gamma-S]nucleotide is purified by binding to mercury-agarose and eluting with buffer containing beta-mercaptoethanol. Specific incorporation of 32P into the beta-position was demonstrated by treating [beta-32P][gamma-S]GTP with 7% formic acid to remove the gamma-thiophosphate and digesting the remaining [beta-32P]GDP with nucleotide pyro-phosphatase. Although 5'-GMP was released after pyrophosphatase digestion, the only 32P radioactivity detected was as inorganic phosphate.lld:pubmed
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pubmed-article:6346945pubmed:authorpubmed-author:HuangR CRClld:pubmed
pubmed-article:6346945pubmed:authorpubmed-author:ReeveA EAElld:pubmed
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pubmed-article:6346945pubmed:volume130lld:pubmed
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pubmed-article:6346945pubmed:pagination14-8lld:pubmed
pubmed-article:6346945pubmed:dateRevised2008-11-21lld:pubmed
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pubmed-article:6346945pubmed:year1983lld:pubmed
pubmed-article:6346945pubmed:articleTitleSynthesis and affinity purification of beta-32P-labeled [gamma-S]GTP.lld:pubmed
pubmed-article:6346945pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:6346945pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed