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Relation between cell wall turnover and cell growth in Bacillus subtilis.

L Glaser, B Lindsay

    Journal of Bacteriology
    |May 1, 1977
    PubMed
    Summary

    Cell wall turnover in Bacillus subtilis follows first-order kinetics and is linked to cell growth. Amino acid deprivation halts this process, delaying its initiation.

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    Area of Science:

    • Microbiology
    • Cell Biology
    • Biochemistry

    Background:

    • Cell wall integrity is crucial for bacterial survival.
    • Understanding cell wall dynamics, including turnover, is essential for deciphering bacterial growth and response to environmental changes.

    Purpose of the Study:

    • To investigate the kinetics of cell wall turnover in Bacillus subtilis.
    • To determine the relationship between cell wall turnover and bacterial growth conditions, specifically amino acid availability.

    Main Methods:

    • Pulse-labeling of peptidoglycan using N-acetylglucosamine.
    • Induction of amino acid starvation in auxotrophic strains.
    • Monitoring peptidoglycan stability and degradation rates.

    Main Results:

    • Newly synthesized peptidoglycan is initially stable, followed by degradation via first-order kinetics.
    • Amino acid deprivation leads to a cessation of cell wall turnover.
    • Amino acid starvation during the lag phase delays turnover initiation, and newly synthesized cell wall is still subject to turnover upon growth resumption.

    Conclusions:

    • Cell wall turnover in Bacillus subtilis is dependent on cell growth and elongation.
    • Cell growth regulation plays a key role in controlling autolytic enzyme activity involved in cell wall turnover.

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