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Replication defective RP4 plasmids recovered after chromosomal integration.

N J Grinter

    Plasmid
    |January 1, 1984
    PubMed
    Summary
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    This study engineered composite plasmids (pHH6000) using IncP plasmid RP4 and bacteriophage lambda DNA. Integrated and regenerated plasmids showed altered replication and stability, revealing RP4 control functions operate independently of a complete replicon.

    Area of Science:

    • Molecular Biology
    • Genetics
    • Microbiology

    Background:

    • Composite replicons combining plasmid and phage DNA are valuable tools.
    • Understanding plasmid replication and stability is crucial for genetic engineering.

    Purpose of the Study:

    • To investigate the properties of composite replicons (pHH6000) derived from IncP plasmid RP4 and bacteriophage lambda.
    • To analyze the replication, establishment, and stability of these composite plasmids after chromosomal integration and regeneration.

    Main Methods:

    • In vitro ligation of IncP plasmid RP4 and bacteriophage lambda DNA to create composite replicon pHH6000.
    • Homologous recombination to integrate pHH6000 into the Escherichia coli chromosome.
    • Regeneration of plasmids from integrated molecules for analysis.

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    Main Results:

    • Regenerated plasmids exhibited altered replication properties, with some becoming lambda-dependent.
    • Reduced ability (100- to 1000-fold) for establishment in lambda lysogens was observed.
    • RP4 incompatibility and stability functions were expressed even without an intact RP4 replicon.

    Conclusions:

    • RP4 incompatibility and partitioning control do not necessitate a complete RP4 replicon.
    • Integrated RP4 molecules might negatively impact host cells.
    • Composite plasmids utilizing cloned lambda genes are useful for studying RP4 molecule distribution during cell division.