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Related Experiment Videos

Versatile cloning vector for Pseudomonas aeruginosa.

D O Wood, M F Hollinger, M B Tindol

    Journal of Bacteriology
    |March 1, 1981
    PubMed
    Summary
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    A novel cloning vector, pMW79, was developed for Pseudomonas aeruginosa. This plasmid enables efficient cloning of chromosomal DNA fragments and selection of recombinant clones via antibiotic resistance markers.

    Area of Science:

    • Molecular Biology
    • Microbiology
    • Genetics

    Background:

    • Development of versatile cloning vectors is crucial for genetic manipulation in bacteria.
    • Pseudomonas aeruginosa is an important opportunistic pathogen requiring effective genetic tools.

    Purpose of the Study:

    • To construct and characterize a novel cloning vector, pMW79, for use in Pseudomonas aeruginosa.
    • To evaluate the utility of pMW79 for cloning chromosomal DNA fragments from P. aeruginosa.

    Main Methods:

    • In vitro construction of a composite plasmid (pBR322:RSF1010) designated pMW79.
    • Characterization of pMW79 using restriction enzyme analysis.
    • Cloning of P. aeruginosa chromosomal DNA fragments into pMW79.
    • Transformation of P. aeruginosa and Escherichia coli, and selection of recombinant clones.

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    Main Results:

    • pMW79 is a nonamplifiable, multicopy plasmid (8.4 X 10^6 MW) functional in both P. aeruginosa and E. coli.
    • pMW79 confers carbenicillin and tetracycline resistance in P. aeruginosa.
    • Unique restriction sites (BamHI, SalI, HindIII, HpaI) were identified in pMW79.
    • Cloning into BamHI or SalI sites inactivated the tetracycline resistance gene, allowing selection of recombinants by carbenicillin resistance and tetracycline sensitivity.
    • Stable maintenance of recombinant plasmids containing 0.5-7.0 Mdal DNA fragments in a recA P. aeruginosa host.

    Conclusions:

    • pMW79 is a functional and stable cloning vector for P. aeruginosa.
    • The selectable marker system (Carb^R, Tet^S) facilitates identification of recombinant clones.
    • This vector system supports the stable cloning of large chromosomal DNA fragments in P. aeruginosa.