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. 1989 Apr;63(4):1514–1524. doi: 10.1128/jvi.63.4.1514-1524.1989

An element of the BK virus enhancer required for DNA replication.

A M Del Vecchio 1, R A Steinman 1, R P Ricciardi 1
PMCID: PMC248383  PMID: 2538642

Abstract

The human papovavirus BK virus contains three 68-base-pair (bp) repeats that act as transcriptional enhancers. An analysis of plasmids containing the BK virus origin revealed that sequences within the 68-bp enhancer are required for DNA replication as well as transcription of the early promoter in COS-1 cells. Origins with a single 68-bp repeat replicated as efficiently as did those with three repeats when transfected into COS-1 cells. Replication did not occur in the absence of enhancer sequences and could not be restored by distal placement of enhancers to enhancerless origins. However, as with simian virus 40, replication in vitro was not dependent on the presence of any enhancer sequences. Deletion analysis showed that replication of BK virus origins was dependent on the presence of the first 21 bp of the enhancer contiguous with the A-T-rich stretch of the origin. This 21-bp element is referred to as the rep element. Although in combination with rep the remaining 47 bp of the enhancer appear to increase replication by two- to fivefold, they alone are not sufficient to support replication. Deletions or insertions in the enhancer which did not alter the rep element had no major effect on replication. Site-directed mutagenesis of the Sp1-like site within the rep element, the NF1 site present in the enhancer, or the NF1 site in adjacent late-side sequences each reduced transcription by two- to fivefold, but had no effect on replication, suggesting that replication and transcription can be uncoupled.

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Selected References

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