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Updated: Aug 8, 2025

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging
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Direct Observation of Archaellar Motor Rotation by Single-Molecular Imaging Techniques.

Yoshiaki Kinosita1

  • 1CPR, RIKEN, Wako, Saitama, Japan.

Methods in Molecular Biology (Clifton, N.J.)
|February 26, 2023
PubMed
Summary

Researchers used advanced optical microscopy to study the archaeal archaellum, a unique motility machine. This biophysical method visualizes filament structure and quantifies motor function in real time.

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Area of Science:

  • Microbiology
  • Biophysics
  • Molecular Biology

Background:

  • Single-molecule techniques have elucidated the dynamics of various molecular motors in bacteria and eukaryotes.
  • The archaellum, a motility machine in archaea, comprises a helical filament and a rotary motor, but its function remains less characterized.
  • Conventional optical microscopy faces limitations in characterizing the archaellar motor due to its small size.

Purpose of the Study:

  • To describe a biophysical method for characterizing the archaellum using optical microscopy.
  • To enable visualization and quantification of archaellar filament architecture and motor function.
  • To adapt single-molecular techniques for studying archaeal motility.

Main Methods:

  • Utilizing fluorescence-labeling techniques to visualize archaellar filaments in real time.
Keywords:
ArchaeaArchaellumBeads assayHalobacterium salinarumHaloferax volcaniiMotile ghostOptical microscopyRotary motorSingle-molecular techniquesTIRFM

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  • Attaching a tiny polystyrene bead to the archaellar filament for visualization of motor rotation.
  • Employing optical microscopy to quantify biophysical properties like speed and torque of the rotary motor.

    • Main Results:

    • Demonstrated the visualization of archaellar filament architecture and dynamics.
    • Enabled real-time observation of motor rotation via bead rotation.
    • Provided a method for quantifying the speed and torque produced by the archaellar motor.

    Conclusions:

    • The described biophysical method allows for detailed characterization of the archaeal archaellum.
    • This technique overcomes limitations of conventional microscopy for studying small molecular motors.
    • It offers insights into the fundamental mechanisms of archaeal motility and energy transduction.