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. 1976 Jan;17(1):114–126. doi: 10.1128/jvi.17.1.114-126.1976

Viral RNA Synthesis and Levels of DNA-Dependent RNA Polymerases During Replication of Adenovirus 2

R Weinmann †,1, J A Jaehning †, H J Raskas †, R G Roeder *
PMCID: PMC515394  PMID: 1206798

Abstract

The rates of RNA synthesis in cultured human KB cells infected by adenovirus 2 were estimated by measuring the endogenous RNA polymerase activities in isolated nuclei. The fungal toxin α-amanitin was used to determine the relative and absolute levels of RNA synthesis by RNA polymerases I, II, and III in nuclei isolated during the course of infection. Whereas the level of endogenous RNA polymerase I activity in nuclei from infected cells remained constant relative to the level in nuclei from mock-infected cells, the endogenous RNA polymerase II and III activities each increased about 10-fold. These increases in endogenous RNA polymerase activities were accompanied by concomitant increases in the rates of synthesis in isolated nuclei of viral mRNA precursor, which was monitored by hybridization to viral DNA, and of viral 5.5S RNA, which was quantitated by electrophoretic analysis on polyacrylamide gels. The cellular RNA polymerase levels were measured with exogenous templates after solubilization and chromatographic resolution of the enzymes on DEAE-Sephadex, using procedures in which no losses of activity were apparent. In contrast to the endogenous RNA polymerase activities in isolated nuclei, the cellular levels of the solubilized class I, II, and III RNA polymerases remained constant throughout the course of the infection. Furthermore, no differences were detected in the chromatographic properties of the RNA polymerases obtained from infected or control mock-infected cells. These observations suggest that the increases in endogenous RNA polymerase activities in isolated nuclei are not due to variations in the cellular concentrations of the enzymes. Instead, it is likely that the increased endogenous enzyme activities result from either the large amounts of viral DNA template available as a consequence of viral replication or from functional modifications of the RNA polymerases or from a combination of these effects.

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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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