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. 1992 Jun;66(6):3347–3354. doi: 10.1128/jvi.66.6.3347-3354.1992

Simian virus 40 T antigen activates the late promoter by modulating the activity of negative regulatory elements.

E May 1, F Omilli 1, J Borde 1, P Scieller 1
PMCID: PMC241113  PMID: 1316451

Abstract

Late promoter activity measured before viral DNA replication results from a complex involvement of negative and positive cis-acting elements located both in the enhancer and in the 21-bp repeats. GC motifs located within the 21-bp repeats act in cooperation with sequences overlapping the early TATA box to down-regulate the late promoter activity. Analysis of insertion mutants indicates that the late promoter might be negatively regulated at least partially by the early promoter machinery. The GTI motif located within the enhancer as well as the GC motifs lose the ability to down-regulate the late promoter in the presence of T antigen. Results obtained with tsA58 protein indicate that two different domains of T antigen are involved in the negative autoregulation of the early promoter activity and in the release of the down-regulation of the late promoter by the GC motifs.

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Selected References

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