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Related Experiment Videos

pED100, a conjugative F plasmid derivative without insertion sequences.

N Willetts, D Johnson

    Molecular & General Genetics : MGG
    |January 1, 1981
    PubMed
    Summary
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    The conjugative plasmid pED100, derived from the F plasmid, lacks insertion sequences. It cannot mobilize the E. coli chromosome or provide integrative suppression for dnaA strains.

    Area of Science:

    • Molecular Biology
    • Genetics
    • Microbiology

    Background:

    • The F plasmid is a conjugative plasmid essential for bacterial genetic exchange.
    • Understanding the functional regions of the F plasmid is crucial for genetic engineering and bacterial conjugation studies.
    • Insertion sequences (IS) are mobile genetic elements that can influence plasmid stability and function.

    Purpose of the Study:

    • To characterize the functional role of the replication and transfer regions of the F plasmid.
    • To investigate the necessity of F insertion sequences for chromosome mobilization and integrative suppression.
    • To construct and analyze a minimal conjugative plasmid lacking F insertion sequences.

    Main Methods:

    • Restriction enzyme digestion of the F plasmid with HindIII.

    Related Experiment Videos

  • Ligation of the largest HindIII fragment to create a circular plasmid (pED100).
  • Assays for E. coli chromosome mobilization.
  • Testing for integrative suppression of a dnaA mutant strain.

    • Main Results:

    • The largest HindIII fragment of F contains the complete replication and transfer regions.
    • The resulting circular plasmid, pED100, lacks all F insertion sequences.
    • pED100 demonstrated minimal ability to mobilize the E. coli chromosome.
    • pED100 was unable to provide integrative suppression for a dnaA strain.

    Conclusions:

    • The replication and transfer regions of the F plasmid are sufficient for its basic structure but not for efficient chromosome mobilization.
    • F insertion sequences are essential for the full conjugative and integrative capabilities of the F plasmid.
    • The minimal plasmid pED100 serves as a tool for studying the roles of specific F plasmid components.