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. 1985 Aug;5(8):1859–1869. doi: 10.1128/mcb.5.8.1859

Analysis of an activatable promoter: sequences in the simian virus 40 late promoter required for T-antigen-mediated trans activation.

J M Keller, J C Alwine
PMCID: PMC366901  PMID: 3018532

Abstract

The late promoter of simian virus 40 (SV40) is activated in trans by the viral early gene product, T antigen. We inserted the wild-type late-promoter region, and deletion mutants of it, into chloramphenicol acetyltransferase transient expression vectors to identify promoter sequences which are active in the presence of T antigen. We defined two promoter activities. One activity was mediated by a promoter element within simian virus 40 nucleotides 200 to 270. The activity of this element was detectable only in the presence of an intact, functioning origin of replication and accounted for 25 to 35% of the wild-type late-promoter activity in the presence of T antigen. The other activity was mediated by an element located within a 33-base-pair sequence (simian virus nucleotides 168 to 200) which spans the junction of the 72-base-pair repeats. This element functioned in the absence of both the origin of replication and the T-antigen-binding sites and appeared to be responsible for trans-activated gene expression. When inserted into an essentially promoterless plasmid, the 33-base-pair element functioned in an orientation-dependent manner. Under wild-type conditions in the presence of T antigen, the activity of this element accounted for 65 to 75% of the late-promoter activity. The roles of the 33-base-pair element and T antigen in trans-activation are discussed.

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Selected References

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