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. 1984 Dec;52(3):750–760. doi: 10.1128/jvi.52.3.750-760.1984

Multiple binding sites for polyomavirus large T antigen within regulatory sequences of polyomavirus DNA.

A Cowie, R Kamen
PMCID: PMC254593  PMID: 6092707

Abstract

Polyomavirus large T antigen binds specifically to multiple sites within the regulatory region of the viral genome. Experiments done with crude extracts from wild-type virus-infected mouse cells and immunoprecipitation of protein-DNA complexes localized two high-affinity binding sites on the early region side of the DNA replication origin. Purification of the large T antigen by immunoaffinity chromatography made it possible to refine the analysis through application of DNase I footprinting. The high-affinity interactions were resolved into three closely spaced, but distinct, binding regions. These begin at a site only slightly overlapping the early boundary of the core replication origin, a location highly homologous to that of simian virus 40 large T antigen-binding site I, but then extend away from the origin toward the early coding sequence and thus span the early region transcriptional initiation sites. Each tight-binding region contains from two to four copies of the sequence 5'-(A = T)G(A greater than G)GGC-3' repeated at 9- to 11-base-pair spacing. At high protein concentrations and at low ionic strength, additional sites within the core replication origin and in the enhancer region were protected from DNase I digestion. These minor binding sites also included repeats of sequences related to the consensus, but at different spacings. Our results suggest that, unlike simian virus 40 DNA, the polyomavirus genome may have distinct regions of interaction with its large T antigen which separately are involved in initiation of DNA replication and the regulation of viral transcription.

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Selected References

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