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Related Experiment Videos

Who's Your DadA? d-Alanine Levels Regulate Bacterial Stiffness.

Pascal D Odermatt1,2, Heidi A Arjes2, Fred Chang1

  • 1Department of Cell and Tissue Biology, University of California, San Francisco, California, USA.

Mbio
|October 25, 2018
PubMed
Summary

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Cellular mechanics in Pseudomonas aeruginosa is a complex system. The dadA gene mutation significantly reduced cell stiffness by altering cell wall enzyme expression and cross-linking.

Area of Science:

  • Mechanobiology
  • Bacterial cell envelope
  • Systems biology

Background:

  • The bacterial cell envelope is crucial for maintaining mechanical integrity against environmental stress and high turgor pressure.
  • Understanding how cellular structures are regulated at the cellular scale is a fundamental question in mechanobiology.

Purpose of the Study:

  • To identify genes influencing cell stiffness in Pseudomonas aeruginosa.
  • To explore the biochemical pathways regulating cellular mechanical properties in this pathogen.
  • To investigate the role of d-alanine in bacterial cell mechanics.

Main Methods:

  • Screened a Pseudomonas aeruginosa transposon library.
  • Measured cell stiffness by monitoring cell growth embedded in agarose gel.
Keywords:
Pseudomonashigh-throughput screeningmechanical genomics

Related Experiment Videos

  • Analyzed changes in d-alanine levels and their impact on cell wall components.

    • Main Results:

    • Identified dozens of genes across diverse functional categories affecting cell stiffness, indicating mechanics as a systems-level property.
    • A dadA (d-alanine dehydrogenase) mutant showed decreased expression of cell wall enzymes and reduced cross-linking density.
    • The dadA mutation led to a significant decrease in overall cell stiffness.

    Conclusions:

    • Cellular mechanics in Pseudomonas aeruginosa is an emergent property influenced by numerous genes and biochemical pathways.
    • The d-alanine dehydrogenase (dadA) gene plays a critical role in regulating cell wall synthesis and mechanical properties.
    • Systems-level investigations are essential for understanding the physical properties of cells and their regulation.