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. 1977 Nov;24(2):451–460. doi: 10.1128/jvi.24.2.451-460.1977

Interaction of Simian Virus 40 chromatin with Simian Virus 40 T-antigen.

M Persico-DiLauro, R G Martin, D M Livingston
PMCID: PMC515954  PMID: 199733

Abstract

We have studied the binding of the tumor antigen (T-antigen) of simian virus 40 to simian virus 40 chromatin (minichromosomes). The minichromosomes isolated from infected cells by a modification of standard techniques were relatively free of contaminating RNA and cellular DNA and had a ratio (by weight) of protein to DNA of approximately 1; their DNA was 50 to 60% digestible to an acid-soluble form by staphylococcal nuclease. Cleavage of this chromatin with restriction endonucleases indicated that the nuclease-resistant regions were randomly distributed in the population of minichromosomes, but were not randomly distributed within minichromosomes. Only 20 to 35% of these minichromosomes adsorbed nonspecifically to nitrocellulose filters, permitting binding studies between simian virus 40 T-antigen and chromatin to be performed. Approximately two to three times as much T-antigen was required to bind chromatin as to bind an equivalent amount of free DNA. When T-antigen was present in excess, both chromatin and free DNA were quantitatively retained on the filters. On the other hand, when DNA or chromatin was present in excess, only one-third as much chromatin as DNA was retained. We suggest that T-antigen-chromatin complexes may be formed by the cooperative binding of T-antigen to chromatin, whereas T-antigen-DNA complexes may be formed by simple bimolecular interactions.

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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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