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Related Experiment Videos

Does simian virus 40 T antigen unwind DNA?

R M Myers, M Kligman, R Tjian

    The Journal of Biological Chemistry
    |October 10, 1981
    PubMed
    Summary

    SV40 T antigen does not unwind DNA, according to new research. Experiments using purified proteins and various DNA templates found no unwinding activity, even when controlling for protein-DNA interactions and DNA superhelicity.

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    Area of Science:

    • Molecular Biology
    • Biochemistry
    • Virology

    Background:

    • Protein-induced DNA unwinding is crucial for various cellular processes.
    • SV40 T antigen is a viral protein with known DNA-binding capabilities.
    • The potential DNA unwinding activity of SV40 T antigen has been a subject of investigation.

    Purpose of the Study:

    • To determine if SV40 T antigen possesses DNA unwinding activity.
    • To investigate the influence of protein concentration and DNA template on unwinding.
    • To assess the relationship between T antigen binding and DNA topological state.

    Main Methods:

    • Utilized rapid and accurate techniques for detecting protein-induced DNA unwinding.
    • Performed assays with purified wild type T antigen, D2 protein, and SV80 T protein.
    • Employed various DNA templates including SV40 DNA and pBR322 DNA.
    • Conducted filter binding assays to evaluate protein-DNA interactions and topological state sensitivity.

    Main Results:

    • Purified SV40 T antigen, D2 protein, and SV80 T protein exhibited no DNA unwinding activity.
    • Unwinding activity was absent regardless of ATP and Mg2+ presence or protein concentration.
    • Escherichia coli RNA polymerase demonstrated unwinding activity under identical conditions, serving as a positive control.
    • SV40 T antigen's binding to the viral origin of replication was independent of DNA superhelicity.

    Conclusions:

    • SV40 T antigen does not possess DNA unwinding activity.
    • The binding of T antigen to DNA is not dependent on DNA's topological state.
    • These findings clarify the functional role of SV40 T antigen in DNA-protein interactions.

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