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Related Experiment Videos

Rifampin-resistant mutants of Myxococcus xanthus defective in development.

K Rudd, D R Zusman

    Journal of Bacteriology
    |January 1, 1979
    PubMed
    Summary

    Rifampin-resistant mutants of Myxococcus xanthus revealed RNA polymerase

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    Area of Science:

    • Microbiology
    • Molecular Biology
    • Developmental Biology

    Background:

    • Myxococcus xanthus development involves complex molecular regulation.
    • Rifampin is an antibiotic that inhibits RNA polymerase, a key enzyme in transcription.
    • Understanding gene regulation during M. xanthus development is crucial.

    Purpose of the Study:

    • To investigate the role of RNA polymerase in regulating Myxococcus xanthus development.
    • To identify genes involved in M. xanthus development using rifampin resistance as a screen.

    Main Methods:

    • Screening for rifampin-resistant mutants of M. xanthus with defects in fruiting-body formation.
    • Analyzing mutant phenotypes for defects in aggregation and sporulation.
    • Using transduction to confirm cotransduction of rifampin resistance and developmental defects.
    • Assessing in vitro RNA polymerase activity in resistant mutants.

    Main Results:

    • Approximately 20% of screened mutants exhibited significant defects in developmental aggregation or sporulation.
    • Eleven independent mutants with wild-type growth rates showed stable phenotypes.
    • High cotransduction frequencies (≥99.0%) between rifampin resistance and nonfruiting phenotypes were observed.
    • Mutant RNA polymerases were resistant to rifampin in vitro, confirming alterations in the enzyme.

    Conclusions:

    • RNA polymerase is significantly involved in the molecular regulation of M. xanthus development.
    • Mutations altering RNA polymerase can lead to severe defects in fruiting-body formation without affecting vegetative growth.
    • This study identifies key roles for RNA polymerase in developmental processes of M. xanthus.

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