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Related Experiment Videos

DNA polymerase alpha is associated with replicating SV40 nucleoprotein complexes.

B Otto, E Fanning

    Nucleic Acids Research
    |May 1, 1978
    PubMed
    Summary

    Simian virus 40 (SV40) replication involves specific nucleoprotein complexes. DNA polymerase alpha is the primary enzyme found within these replicating SV40 complexes.

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    Area of Science:

    • Molecular Biology
    • Virology
    • Biochemistry

    Background:

    • Simian virus 40 (SV40) is a well-characterized DNA virus used extensively in biological research.
    • Understanding viral DNA replication mechanisms is crucial for developing antiviral strategies.

    Purpose of the Study:

    • To characterize the enzymatic activities associated with SV40 nucleoprotein complexes during viral DNA replication.
    • To identify the specific DNA polymerase involved in SV40 replication.

    Main Methods:

    • Extraction and fractionation of SV40 nucleoprotein complexes from infected monkey cell nuclei using neutral sucrose density gradients.
    • Assay of DNA polymerase activity within separated fractions.
    • Coprecipitation studies to confirm enzyme association with complexes.
    • Characterization of DNA polymerase activity based on sedimentation, salt optimum, and N-ethylmaleimide sensitivity.

    Main Results:

    • Replicating SV40 DNA (95S complexes) separated from non-replicating viral DNA (75S complexes).
    • DNA polymerase activity was exclusively associated with the 95S replicating complexes.
    • The identified DNA polymerase activity was primarily DNA polymerase alpha, with some DNA polymerase gamma detected. DNA polymerase beta was not found associated with the complexes.

    Conclusions:

    • SV40 DNA replication is carried out by specific nucleoprotein complexes containing viral DNA.
    • DNA polymerase alpha is the principal enzyme responsible for SV40 DNA replication within these complexes.

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