A switch-complex component participating in organization of the bacterial flagellar rotor's cytoplasmic ring.
Its location in the C ring connects assembly of the cytoplasmic rotor structure to the larger switching machinery. Structural assembly, directional switching and ion-driven torque generation involve interacting but distinct components. [ref]
Molecular Biology of the Cell, 4th edition by Bruce Alberts and others. Chapter 1, Bacterial motility
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