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. 1987 Jan;61(1):167–176. doi: 10.1128/jvi.61.1.167-176.1987

Characterization of the simian virus 40 late promoter: relative importance of sequences within the 72-base-pair repeats differs before and after viral DNA replication.

M Ernoult-Lange, F Omilli, D R O'Reilly, E May
PMCID: PMC255228  PMID: 3023694

Abstract

We examined sequences involved in the simian virus 40 (SV40) late promoter in vivo, by using quantitative S1 nuclease analysis of a series of deletion mutants within the SV40 regulatory region. These mutants were constructed so as to place the altered promoter region in its normal position relative to the SV40 late genes. The effects of the deletions on late transcriptional activity were analyzed before and after viral DNA replication, by omitting or including SV40 large T antigen. The data show that (i) in the absence of large T antigen, the deletion of the 21-base-pair (bp) repeats results in a fourfold increase in late transcription, and (ii) the sequences within the 72-bp repeats are a component of the SV40 late promoter, acting not only before, but also after viral DNA replication. We identified two domains which contain sequences important for efficient late transcription. Domain I, at the late proximal end of each 72-bp repeat, was found to function before replication and was possibly also involved after replication. The contribution of domain II, at the late distal end of each 72-bp repeat, was much more significant after replication but only of minor importance before replication.

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