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Suppressor mutations in Pseudomonas aeruginosa

J M Watson, B W Holloway

    Journal of Bacteriology
    |March 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Researchers identified suppressor mutations in Pseudomonas aeruginosa, discovering a new locus (sup-1) that can suppress auxotrophic mutations and create suppressor-sensitive mutants in phages and R factors.

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    Area of Science:

    • Microbiology
    • Genetics
    • Molecular Biology

    Background:

    • Suppressor mutations play a crucial role in genetic research by allowing the study of essential genes.
    • Pseudomonas aeruginosa is an important opportunistic pathogen with a well-characterized genetic system.

    Purpose of the Study:

    • To identify and characterize novel suppressor mutations in Pseudomonas aeruginosa.
    • To investigate the genetic properties and potential applications of these suppressor mutations.

    Main Methods:

    • Isolation and characterization of temperature-sensitive mutants of Pseudomonas aeruginosa strain PAT.
    • Genetic mapping of the suppressor locus (sup-1) using co-transduction with linked markers.
    • Isolation of suppressor-sensitive (sus) mutants of phage E79 and R factor R18.

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  • Characterization of additional suppressor mutations based on growth phenotypes and genetic linkage.

    • Main Results:

    • A novel suppressor locus, sup-1, was identified in Pseudomonas aeruginosa strain PAT.
    • The sup-1 locus was mapped and found to be co-transducible with thr loci.
    • sup-1 enabled the isolation of suppressor-sensitive mutants of phage E79 and R factor R18.
    • Two classes of suppressor mutations were identified, differing in their temperature sensitivity.
    • The sup-1 locus appears distinct from known amber and ochre suppressors in Escherichia coli.

    Conclusions:

    • Novel suppressor mutations in Pseudomonas aeruginosa have been identified and characterized.
    • The sup-1 locus provides a new tool for genetic manipulation in Pseudomonas aeruginosa, phages, and plasmids.
    • The distinct nature of sup-1 suggests a different mechanism compared to enterobacterial nonsense suppressors.