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. 1974 Sep;71(9):3426–3430. doi: 10.1073/pnas.71.9.3426

Role of DNA-Dependent RNA Polymerases II and III in Transcription of the Adenovirus Genome Late in Productive Infection

Roberto Weinmann *, Heschel J Raskas †, Robert G Roeder *
PMCID: PMC433786  PMID: 4530313

Abstract

DNA-dependent RNA polymerases I, II, and III were isolated and partially purified from KB (human) cells 18 hr after infection with adenovirus 2. As reported previously for the enzymes from other animal cells, RNA polymerase II was completely sensitive to low concentrations of α-amanitin (50% inhibition at 0.02 μg/ml), RNA polymerase III was completely sensitive to high concentrations of α-amanitin (50% inhibition at 20 μg/ml) and RNA polymerase I was totally resistant to concentrations of α-amanitin less than or equal to 200 μg/ml. RNA synthesis by the endogenous RNA polymerase activities in nuclei isolated from infected cells was completely sensitive to α-amanitin, thus suggesting that RNA polymerase I is not involved in viral DNA transcription even though it is present in these cells. The α-amanitin inhibition curve was biphasic and showed inflection points at about 0.02 and 20 μg/ml, suggesting the participation of both RNA polymerases II and III in the synthesis of RNA in these nuclei. Furthermore, at least a large fraction of the synthesis of the nuclear precursors to viral mRNA, monitored by hybridization to viral DNA, showed the same sensitivity to α-amanitin as did RNA polymerase II; and the synthesis of both viral 5.5S RNA and (presumably cellular) 5S RNA in the isolated nuclei exhibited the same sensitivity to α-amanitin as did purified RNA polymerase III. Thus, these data provide strong supporting evidence for previous studies which suggested the involvement of an RNA polymerase II in transcription of the adenovirus genome and demonstrate the role of an RNA polymerase III activity in the synthesis of viral 5.5S RNA and cellular 5S RNA.

Keywords: RNA polymerase, α-amanitin, 5.5S viral RNA, 5S host RNA

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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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