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Related Experiment Videos

Response tuning in bacterial chemotaxis.

R Jasuja1, Y Lin, D R Trentham

  • 1Department of Physiology, Albert Einstein College of Medicine, Bronx, NY 10461, USA.

Proceedings of the National Academy of Sciences of the United States of America
|September 29, 1999
PubMed
Summary

Bacteria sense chemical signals for movement using a sensitive pathway. This study reveals that cooperative interactions amplify the signal, enabling bacteria to detect even minor changes in attractant levels.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Cellular Biology

Background:

  • Bacterial chemotaxis allows movement towards attractants, crucial for survival.
  • Intracellular pathways for chemotaxis are known, but high sensitivity mechanisms are unclear.
  • Attractant binding to receptors modulates CheA kinase activity, affecting CheY phosphorylation (CheY-P) and run duration.

Purpose of the Study:

  • To investigate the stimulus-response relationship in bacterial chemotaxis.
  • To elucidate the mechanisms underlying the high sensitivity of the chemotaxis response.
  • To characterize the excitation signal generation in response to rapid attractant concentration changes.

Main Methods:

  • Utilized rapid (millisecond timescale) concentration jumps of aspartate using photolabile precursors.

Related Experiment Videos

  • Measured bacterial excitation responses mediated by the Tar receptor.
  • Determined the stimulus-response relation over a wide range of adapted aspartate concentrations.

    • Main Results:

    • Bacteria detected <1% changes in Tar receptor occupancy.
    • Responsiveness was maintained across three orders of magnitude of aspartate concentration.
    • Response amplitude showed a logarithmic increase with stimulus strength, indicating signal amplification.
    • The stimulus-response pattern suggests cooperative interactions in signal generation.

    Conclusions:

    • Bacterial chemotaxis exhibits high sensitivity due to signal amplification mechanisms.
    • Cooperative interactions, possibly involving multiple signaling complexes or dephosphorylation pathways, are key to this amplification.
    • Understanding these mechanisms provides insight into cellular signal processing and bacterial adaptation.