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DNA synthesis in vitro dependent upon phiX174 replicative form I DNA

C Sumida-Yasumoto, A Yudelevich, J Hurwitz

    Proceedings of the National Academy of Sciences of the United States of America
    |June 1, 1976
    PubMed

    Insights

    Bacteriophage phiX174 DNA replication in E. coli extracts requires specific gene products and host factors. This semiconservative DNA synthesis yields replicative form I and II DNA, essential for phage propagation.

    Area of Science:

    • Molecular Biology
    • Virology
    • Genetics

    Background:

    • Bacteriophage phiX174 is a small, single-stranded DNA virus.
    • Replication of phiX174 DNA involves a double-stranded replicative form (RF).
    • Understanding viral DNA synthesis is crucial for molecular biology.

    Purpose of the Study:

    • To investigate the requirements for phiX174 DNA synthesis in vitro.
    • To identify the specific host and viral factors involved in phiX174 DNA replication.

    Main Methods:

    • DNA synthesis assays using Escherichia coli extracts.
    • Employing double-stranded, circular phiX174 replicative form I (RFI) DNA as a template.
    • Analysis of reaction products and inhibition studies with specific drugs.

    Main Results:

    • DNA synthesis was dependent on Mg++, ATP, dNTPs, and exogenous phiX RFI DNA.
    • The reaction produced both phiX RFI and phiX RFII DNA via a semiconservative process.
    • Nalidixic acid and novobiocin inhibited DNA synthesis, while rifampicin did not.

    Conclusions:

    • PhiX174 DNA synthesis requires the viral gene A product.
    • Essential E. coli host factors include dnaB, dnaC(D), dnaG, and rep proteins.
    • The identified factors and conditions provide insight into viral DNA replication mechanisms.

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