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Plasmid repopulation kinetics in Staphylococcus aureus.

S K Highlander, R P Novick

    Plasmid
    |May 1, 1987
    PubMed
    Summary
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    Staphylococcus aureus plasmid pT181 corrects copy number fluctuations through a replication burst, overshooting steady-state levels before inhibition. This mechanism requires an active inhibitor for proper regulation.

    Area of Science:

    • Molecular Biology
    • Microbiology
    • Genetics

    Background:

    • The Staphylococcus aureus plasmid pT181 is indirectly controlled and exhibits fluctuations in copy number.
    • Understanding plasmid replication kinetics is crucial for genetic stability and biotechnological applications.

    Purpose of the Study:

    • To analyze the kinetic route of Staphylococcus aureus plasmid pT181 copy number correction.
    • To investigate the role of active inhibitors in regulating plasmid replication rates and copy number stability.

    Main Methods:

    • Utilized thermosensitive replication (Tsr) mutants of pT181 to reduce copy number at nonpermissive temperatures.
    • Shifted Tsr mutants to permissive temperatures to observe repopulation kinetics.
    • Introduced plasmids into naive cells via high-frequency transduction to study replication dynamics.

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    Main Results:

    • Plasmids with active inhibitors showed a replication burst, overshooting steady-state copy numbers before reestablishment.
    • A pT181 copy mutant lacking functional inhibitor-target regulation repopulated asymptotically without overshoot.
    • Maximal replication rate was independent of the plasmid's cop genotype.

    Conclusions:

    • pT181 replicates at near-maximal rates at low copy numbers, leading to overshoot due to inhibitor accumulation.
    • Active inhibitor concentration is critical for regulating pT181 replication and achieving steady-state copy number.
    • In the absence of active inhibition, other invariant factors likely limit the steady-state copy number.