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Bacterial flagellum: visualizing the complete machine in situ.

David DeRosier1

  • 1Department of Life Sciences, MS029 Brandeis University, Waltham, Massachusetts 02454-9110, USA. derosier@brandeis.edu

Current Biology : CB
|November 7, 2006
PubMed
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Electron tomography and single particle averaging revealed detailed structures of the bacterial flagellum. This technique visualized key components like the rotor, stator, and export apparatus in intact bacteria.

Area of Science:

  • Microbiology
  • Structural Biology
  • Biophysics

Background:

  • The bacterial flagellum is a complex molecular machine responsible for motility.
  • Understanding its structure is crucial for deciphering its function and assembly.

Purpose of the Study:

  • To visualize the intact bacterial flagellum at high resolution.
  • To identify and characterize the components of the flagellar motor and export system.

Main Methods:

  • Cryo-electron tomography (cryo-ET) was employed on frozen-hydrated bacteria.
  • Single particle averaging (SPA) was utilized to enhance image quality and resolve structural details.

Main Results:

  • Stunning, high-resolution images of the complete bacterial flagellum were obtained.

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  • Detailed features of the flagellar rotor, stator, and export apparatus were clearly revealed.
  • The spatial organization of these components within the intact cell was elucidated.

    • Conclusions:

    • Cryo-ET combined with SPA is a powerful approach for studying large molecular machines in situ.
    • This study provides unprecedented structural insights into the bacterial flagellar motor and its associated export machinery.