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RNA polymerase subunit biosynthesis in Bacillus subtilis.

R T Libby, L R Brown

    Molecular & General Genetics : MGG
    |January 1, 1982
    PubMed
    Summary
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    Bacillus subtilis RNA polymerase subunit synthesis was studied. Results indicate an alpha-subunit pool and differential regulation during growth shifts and sporulation.

    Area of Science:

    • Molecular Biology
    • Microbiology
    • Biochemistry

    Background:

    • RNA polymerase is crucial for gene transcription in bacteria.
    • Understanding its biosynthesis regulation is key to cellular processes.
    • Bacillus subtilis serves as a model organism for bacterial studies.

    Purpose of the Study:

    • To investigate the relative synthesis rates of RNA polymerase subunits in Bacillus subtilis.
    • To determine subunit stoichiometries and identify regulatory mechanisms.
    • To examine how subunit synthesis responds to environmental changes.

    Main Methods:

    • Utilized steady-state growth conditions and pulse-labeling with [3H].
    • Employed subunit fractionation via SDS-polyacrylamide gel electrophoresis.

    Related Experiment Videos

  • Applied immunoprecipitation for subunit detection and quantification.

    • Main Results:

    • Identified an existing pool of the alpha-subunit for holoenzyme assembly.
    • Observed differential regulation of core enzyme and alpha-subunit synthesis during nutrient upshift.
    • Noted a coordinated decrease in all subunit synthesis during shift-down, followed by adaptation.
    • Demonstrated a specific reduction in beta and beta' subunit synthesis during sporulation.

    Conclusions:

    • The alpha-subunit is available in a pre-formed pool for efficient RNA polymerase assembly.
    • Bacillus subtilis exhibits complex regulatory strategies for RNA polymerase subunit biosynthesis.
    • These mechanisms allow adaptation to changing growth conditions and developmental processes like sporulation.