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Related Experiment Videos

T-antigen-DNA polymerase alpha complex implicated in simian virus 40 DNA replication.

S T Smale, R Tjian

    Molecular and Cellular Biology
    |November 1, 1986
    PubMed
    Summary

    Simian virus 40 (SV40) large T antigen interacts with cellular DNA polymerase alpha. This interaction is crucial for initiating SV40 DNA replication, as shown by antibody inhibition studies.

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    Area of Science:

    • Molecular Biology
    • Virology
    • Biochemistry

    Background:

    • Simian virus 40 (SV40) DNA replication relies on viral large T antigen and host cell factors.
    • Understanding the precise molecular mechanisms of SV40 replication initiation is essential.

    Purpose of the Study:

    • To investigate the biochemical interactions between SV40 large T antigen and cellular DNA replication machinery.
    • To identify the specific cellular components that interact with SV40 large T antigen during DNA replication.

    Main Methods:

    • In vitro DNA replication assays using SV40 origin mutants.
    • Immunoprecipitation using monoclonal antibodies against SV40 large T antigen.
    • Affinity chromatography with T-antigen-bound columns.

    Main Results:

    • Specific domains of SV40 large T antigen form a complex with cellular DNA polymerase alpha.
    • Monoclonal antibodies confirmed the T antigen-DNA polymerase alpha interaction and demonstrated that some antibodies could inhibit this interaction and replication.
    • DNA polymerase alpha efficiently bound to a T-antigen affinity column, validating immunoprecipitation findings.

    Conclusions:

    • The association between SV40 large T antigen and DNA polymerase alpha is a critical step in the initiation of SV40 DNA replication.
    • This interaction highlights the interplay between viral proteins and host cellular replication machinery.

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