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. 1984 Jan;81(1):23–27. doi: 10.1073/pnas.81.1.23

Mapping of the late promoter of simian virus 40.

S W Hartzell, B J Byrne, K N Subramanian
PMCID: PMC344602  PMID: 6320166

Abstract

Mapping of the simian virus 40 (SV40) late promoter was carried out in the absence of the viral early protein, large tumor (T) antigen, and replication of the viral DNA template. SV40 late control region DNA fragments, containing specific deletions, were cloned directly upstream from the coding region of the herpes simplex virus-1 (HSV-1) thymidine kinase (TK; ATP:thymidine 5'-phosphotransferase, EC 2.7.1.21) gene (tk). The promoter activities of the fragments were determined by measuring the tk transformation frequencies of the chimeric tk constructs in mouse L TK- APRT- (adenine phosphoribosyltransferase-negative) and human 143B TK- cell lines. The following results were obtained. (i) The SV40 control region functions with equal efficiencies in the early and late promoter orientations. (ii) A major late control element has been localized within the G+C-rich 21-base-pair (bp) repeat. Thus, in conjunction with our earlier results, the 21-bp repeat is a bidirectional promoter element functioning as a major component of both the early and late promoters and is an element that enhances the replication efficiency of SV40 DNA. (iii) Minor late promoters have been localized within the minimal replication origin and the 72-bp repeat. (iv) The minimal replication origin is not per se a constituent of the major late promoter; however, both the minimal replication origin and the 21-bp repeat are required for obtaining high levels of late gene expression observed at late times after infection by SV40. (v) The 72-bp repeat exerts a 4- to 5-fold enhancement of late promoter expression.

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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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