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Biophysical Characterization of Flagellar Motor Functions
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Bacterial flagellar motor as a multimodal biosensor.

Ekaterina Krasnopeeva1, Uriel E Barboza-Perez1, Jerko Rosko2

  • 1Centre for Synthetic and Systems Biology, School of Biological Sciences, The University of Edinburgh, Edinburgh, United Kingdom.

Methods (San Diego, Calif.)
|July 9, 2020
PubMed
Summary

The bacterial flagellar motor, a rotary machine enabling swimming and chemotaxis, is a versatile biosensor. Its properties allow it to sense chemicals and mechanical forces, offering insights into bacterial physiology and molecular biophysics.

Keywords:
Bacterial flagellar motorBacterial physiologyBiosensorChemotaxisMechanosensingProton motive forceSingle molecular biophysics

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Area of Science:

  • Microbiology
  • Biophysics
  • Molecular Biology

Background:

  • The bacterial flagellar motor is a complex rotary molecular machine crucial for bacterial motility and chemotaxis.
  • It functions as a key component of bacterial chemical signaling networks, enabling directed movement in response to environmental stimuli.
  • The motor's rotational speed is influenced by ion gradients, and its direction is controlled by the chemotactic network.

Purpose of the Study:

  • To explore the potential of the bacterial flagellar motor as a multifunctional biosensor.
  • To discuss its utility in characterizing the external environment and bacterial physiology.
  • To highlight its application in studying single molecular motor biophysics.

Main Methods:

  • Review of existing literature on bacterial flagellar motor function and properties.
  • Analysis of the motor's known responses to chemical gradients and mechanical stimuli.
  • Discussion of theoretical and experimental frameworks for biosensor applications.

Main Results:

  • The bacterial flagellar motor's rotational speed is linearly proportional to electrochemical gradients (proton or sodium).
  • The motor's direction is regulated by the chemotactic signaling network.
  • Recent findings reveal the motor also acts as a mechanosensor.

Conclusions:

  • The bacterial flagellar motor's multifaceted properties position it as a promising multifunctional biosensor.
  • It can be utilized as a tool to study bacterial physiology, external environments, and single molecular motor biophysics.