Journal of Bioenergetics and Biomembranes

, Volume 21, Issue 6, pp 705–716 | Cite as

Na+-driven bacterial flagellar motors

  • Yasuo Imae
  • Tatsuo Atsumi


Bacterial flagellar motors are the reversible rotary engine which propels the cell by rotating a helical flagellar filament as a screw propeller. The motors are embedded in the cytoplasmic membrane, and the energy for rotation is supplied by the electrochemical potential of specific ions across the membrane. Thus, the analysis of motor rotation at the molecular level is linked to an understanding of how the living system converts chemical energy into mechanical work. Based on the coupling ions, the motors are divided into two types; one is the H+-driven type found in neutrophiles such asBacillus subtilis andEscherichia coli and the other is the Na+-driven type found in alkalophilicBacillus and marineVibrio. In this review, we summarize the current status of research on the rotation mechanism of the Na+-driven flagellar motors, which introduces several new aspects in the analysis.

Key Words

Bacterial flagellar motor Na+-driven motor alkalophilicBacillus marineVibrio amiloride sodium motive force 


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Copyright information

© Plenum Publishing Corporation 1989

Authors and Affiliations

  • Yasuo Imae
    • 1
  • Tatsuo Atsumi
    • 1
  1. 1.Department of Molecular Biology, Faculty of ScienceNagoya UniversityNagoyaJapan

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