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. 1977 Sep;74(9):3677–3680. doi: 10.1073/pnas.74.9.3677

Poliovirus-specific primer-dependent RNA polymerase able to copy poly(A).

J B Flanegan, D Baltimore
PMCID: PMC431685  PMID: 198796

Abstract

A template-dependent RNA polymerase has been isolated from poliovirus-infected cells by assaying for the ability of the enzyme to copy poly(A) complexed to an oligo(U) primer. The polymerase was solubilized with detergent, and RNA was removed by precipitation with 2 M LiCl. The solubilized polymerase required both poly(A) and oligo(U) for activity and was stimulated by Mg2+ but was inhibited by Mn2+. Poly(A)-oligo(U)-dependent poly(U) polymerase was not found in extracts of HeLa cells until about 2 hr after poliovirus infection, and then there was a linear increase in activity until about 5 hr. Analysis of the polymerase by glycerol gradient centrifugation showed that the majority of the activity sedimented at about 4 S, indicating that it was no longer complexed with high-molecular-weight RNA or cellular membranes. This poly(A)-oligo(U)-dependent polymerase activity could represent an important component of the poliovirus RNA-dependent RNA polymerase.

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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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