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. 1978 Oct;75(10):4793–4797. doi: 10.1073/pnas.75.10.4793

Enzymatic conversion of 5'-phosphate-terminated RNA to 5'-di- and triphosphate-terminated RNA.

E Spencer, D Loring, J Hurwitz, G Monroy
PMCID: PMC336206  PMID: 217000

Abstract

We have isolated from vaccinia virus cores an enzyme, 5'-phosphate-polyribonucleotide kinase, that in the presence of ATP and Mg2+ catalyzes the conversion of 5'-phosphate and 5'-diphosphate termini of RNA to the 5'-triphosphate species. With the exception of dATP, other nucleoside triphosphates were inactive as phosphate donors; activity with dATP was 10% of that observed with ATP. The purified enzyme did not phosphorylate 5'-hydroxyl- or 5'-monophosphate-terminated polydeoxyribonucleotides, although a variety of 5'- monophosphate-terminated RNA chains were active as phosphate acceptors. By using a coupled system of 5'-phosphate-polyribonucleotide kinase and guanylyltransferase in the presence of ATP, GTP, Mg2+, and S-adenosylmethionine, capping of 5'-P-, 5'-PP-, and 5'-PPP-RNA was demonstrated; in the absence of 5'-phosphate-polyribonucleotide kinase only 5'-PPP-RNA was capped by guanylyltransferase.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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