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. 1993 Sep;67(9):5394–5401. doi: 10.1128/jvi.67.9.5394-5401.1993

Reactivation of transcription from a vaccinia virus early promoter late in infection.

J Garcés 1, K Masternak 1, B Kunz 1, R Wittek 1
PMCID: PMC237940  PMID: 8350402

Abstract

We have studied the kinetics of RNA synthesis from the vaccinia virus 7,500-molecular-weight gene (7.5K gene) which is regulated by early and late promoters arranged in tandem. Unexpectedly, after a first burst of RNA synthesis early in infection, transcription was reactivated late in infection. Reactivation was not dependent on the location of the promoter in the genome or on the presence of the upstream late regulatory sequences. The mRNA synthesized from the reactivated promoter in the late phase had the same 5' and 3' ends as the molecules transcribed in the early phase. Interestingly, these molecules were efficiently translated despite the absence of the poly(A) leader characteristic of late mRNAs. Reactivation appears to be dependent on virus assembly since it is prevented by rifampin, a specific inhibitor of morphogenesis. Finally, analysis of various other early genes showed that reactivation is not unique to the 7.5K early promoter.

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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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