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Related Experiment Videos

Plasmid P1 replication: negative control by repeated DNA sequences.

D Chattoraj, K Cordes, A Abeles

    Proceedings of the National Academy of Sciences of the United States of America
    |October 1, 1984
    PubMed
    Summary

    The incA locus of plasmid P1, containing repetitive DNA sequences, negatively controls plasmid replication. Extra copies of incA interfere with replication by titrating the essential RepA protein.

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    Basic life sciences·1985

    Area of Science:

    • Molecular Biology
    • Genetics
    • Microbiology

    Background:

    • The P1 plasmid is a low-copy-number plasmid crucial for bacterial genetics research.
    • Plasmid incompatibility (inc) loci regulate the coexistence of plasmids within a cell.
    • The incA locus of P1 plasmid has been implicated in plasmid stability and copy number control.

    Purpose of the Study:

    • To investigate the function of the incA locus in P1 plasmid replication and stability.
    • To determine the molecular mechanism by which incA controls plasmid copy number.
    • To elucidate the role of repetitive sequences within incA.

    Main Methods:

    • In vivo studies involving manipulation of incA fragments in P1 plasmids and high-copy-number vectors.
    • Analysis of plasmid DNA replication and copy number in the presence of altered incA sequences.

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  • In vitro binding assays to assess the interaction between the RepA protein and the incA fragment.

    • Main Results:

    • Extra copies of the incA fragment destabilize P1 plasmids by interfering with DNA replication.
    • Deletion of most of the incA locus leads to an increased plasmid copy number.
    • Fragments containing as few as three repeats of the incA sequence efficiently destabilize P1 plasmids.
    • The RepA protein, essential for P1 replication, binds to the incA fragment in vitro.

    Conclusions:

    • The incA locus is not essential for P1 plasmid replication but is critical for its copy number control.
    • The repetitive DNA sequences within incA likely function by titrating the P1-encoded RepA protein, thereby negatively regulating replication.
    • incA acts as a regulatory element, ensuring stable inheritance of the P1 plasmid.