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Related Experiment Video

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Biophysical Characterization of Flagellar Motor Functions
06:08

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Published on: January 18, 2017

Exchange of rotor components in functioning bacterial flagellar motor.

Hajime Fukuoka1, Yuichi Inoue, Shun Terasawa

  • 1Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Aoba-ku, Sendai 980-8577, Japan.

Biochemical and Biophysical Research Communications
|February 27, 2010
PubMed
Summary
This summary is machine-generated.

Bacterial flagellar motors are not static. This study shows rotor components like FliN and FliM are exchanged in functioning motors, revealing new insights into their dynamic working mechanisms.

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Area of Science:

  • Microbiology
  • Biophysics
  • Molecular Biology

Background:

  • Bacterial flagellar motors generate torque through rotor-stator interactions.
  • The motor's structure was previously considered static, but stator exchange in rotating motors is known.
  • Understanding rotor component dynamics is crucial for elucidating motor function.

Purpose of the Study:

  • To investigate the dynamics and turnover of rotor components in a functioning bacterial flagellar motor.
  • To determine if rotor components are exchanged during motor rotation.

Main Methods:

  • Constructed expression systems for GFP-tagged FliN, FliM, and FliG.
  • Functionally incorporated GFP-fusions into the flagellar motor.
  • Utilized fluorescence recovery after photobleaching (FRAP) with total internal reflection fluorescence microscopy.

Main Results:

  • Fluorescence recovery was observed at the rotational center for GFP-FliN and FliM-GFP in rotating motors.
  • No fluorescence recovery was observed for GFP-FliG.
  • Calculated FliN subunit turnover rate as 0.0007s⁻¹, indicating exchange within tens of minutes.

Conclusions:

  • Bacterial flagellar motors are dynamic structures, not static, even during function.
  • This is the first report demonstrating rotor component exchange in a functioning bacterial flagellar motor.
  • The findings provide novel insights into the dynamic nature of flagellar motor operation.