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Feedback control architecture and the bacterial chemotaxis network.

Abdullah Hamadeh1, Mark A J Roberts, Elias August

  • 1Department of Engineering Science, University of Oxford, Oxford, United Kingdom.

Plos Computational Biology
|May 17, 2011
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Summary

Bacteria adapt to environmental changes using chemotaxis signaling. This study reveals that cascade control feedback in Rhodobacter sphaeroides enhances bacterial sensing robustness and performance, unlike simpler pathways.

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Area of Science:

  • Microbiology
  • Systems Biology
  • Biophysics

Background:

  • Bacteria navigate environments via chemotaxis, a process regulated by signaling pathways.
  • Feedback mechanisms within these pathways allow bacteria to adapt to environmental stimuli.
  • While extensively studied in *Escherichia coli*, complex chemotaxis pathways with multiple protein homologues are common in other bacteria.

Purpose of the Study:

  • To investigate the configuration and function of feedback in the multi-homologue chemotaxis system of *Rhodobacter sphaeroides*.
  • To compare the performance and robustness of different feedback architectures in complex bacterial signaling.
  • To determine the optimal feedback configuration for robust chemotaxis in bacteria with multiple signaling pathways.

Main Methods:

  • Development of four mathematical models representing distinct feedback configurations in *Rhodobacter sphaeroides* chemotaxis.
  • Experimental validation to discriminate between the proposed feedback models.
  • Analysis of model robustness against parametric uncertainties and intracellular noise.

Main Results:

  • Three of the four proposed feedback models were experimentally invalidated.
  • The remaining model, featuring a 'cascade control' architecture, demonstrated superior performance and robustness.
  • This cascade control architecture is analogous to systems used in engineering for enhanced performance and reliability.

Conclusions:

  • Cascade control feedback is crucial for robust functionality in complex bacterial chemotaxis pathways.
  • Bacteria with multiple chemotaxis pathways benefit from specific feedback architectures, like cascade control, for improved performance.
  • This finding has implications for understanding bacterial adaptation and potentially engineering biological systems.