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Bacteriophage Mu: a transposing replicon

N P Higgins, P Manlapaz-Ramos, R T Gandhi

    Cell
    |June 1, 1983
    PubMed

    Insights

    This study shows that Mu DNA replication in vitro involves semiconservative replication of Mu sequences within Mu boundaries, dependent on protein synthesis. These findings suggest observation of genuine Mu transposition-replication steps.

    Area of Science:

    • Molecular Biology
    • Microbiology
    • Genetics

    Background:

    • Mu DNA replication is a complex process involving transposition.
    • Understanding the in vitro mechanisms of Mu replication is crucial for deciphering its lifecycle.

    Purpose of the Study:

    • To investigate the in vitro replication of Mu DNA.
    • To determine if observed replication steps align with bona fide Mu transposition-replication.

    Main Methods:

    • In vitro replication of Mu DNA on cellophane discs using dBUTP.
    • Analysis of replicated DNA using CsCl density gradients.
    • Assessment of protein synthesis inhibition effects on replication.

    Main Results:

    • Sheared Mu DNA (80 kb) showed anomalous banding in CsCl gradients, indicating intermediate density DNA.
    • This intermediate DNA contained semiconservatively replicated Mu sequences alongside unreplicated DNA.
    • Replication and intermediate DNA formation were abolished by inhibiting protein synthesis prior to lysis.

    Conclusions:

    • Mu DNA replication in vitro occurs within Mu boundaries.
    • The observed replication process is dependent on protein synthesis, suggesting genuine transposition-replication steps are occurring in vitro.

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