A stator protein contributing to ion-coupled force generation in proton-driven bacterial flagellar motors.
Together with its stator partners, it couples ion movement to mechanical interaction with the rotor. The surrounding membrane supplies an electrochemical energy source; the flagellar filament is the load rather than the source of that energy. [ref]
Molecular Biology of the Cell, 4th edition by Bruce Alberts and others. Chapter 1, Bacterial motility
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