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Simian virus 40 DNA replication in nuclear monolayers.

D J Le Blanc, M F Singer

    Journal of Virology
    |October 1, 1976
    PubMed
    Summary
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    Simian virus 40 DNA replication involves synthesizing short fragments and then joining them. Higher TTP concentrations favor fragment joining, indicating a TTP-dependent step in viral DNA replication.

    Area of Science:

    • Molecular Biology
    • Virology
    • Biochemistry

    Background:

    • Simian virus 40 (SV40) is a well-characterized model system for studying eukaryotic DNA replication.
    • Understanding viral DNA replication mechanisms provides insights into cellular processes.

    Purpose of the Study:

    • To investigate the characteristics of SV40 DNA replication intermediates.
    • To determine the role of thymidine triphosphate (TTP) concentration in SV40 DNA synthesis.

    Main Methods:

    • Preparation of nuclear monolayers from BSC-1 monkey kidney cells treated with Nonidet P-40.
    • Analysis of viral replicative intermediates using neutral and alkaline sucrose gradient sedimentation.
    • Assessment of newly synthesized DNA strand sizes and TTP concentration effects.

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    Main Results:

    • Two viral replicative intermediates (25-26S and 22-23S) were identified.
    • Newly synthesized DNA strands consisted of 4-7S fragments and 10-16S full-length strands.
    • Higher TTP concentrations (10-50 muM) favored the synthesis of longer strands, suggesting TTP is critical for fragment ligation.

    Conclusions:

    • SV40 DNA replication proceeds via Okazaki-like fragment synthesis and subsequent joining.
    • The ligation step of SV40 DNA replication is highly dependent on TTP concentration.
    • Nuclear monolayers are a suitable system for studying SV40 DNA replication dynamics.