Flagellar basal body-associated protein FliL
The FliL protein controls the rotational direction of the flagella during chemotaxis. FliL is a cytoplasmic membrane protein associated with the basal body. This protein is a component of the flagellar motor and it is known to enhance the motor performance under high-load conditions in some bacteria. The periplasmic domain of FliL (Flil_C) share significant structural similarity with stomatin/prohibitin/flotillin/HflK/C domains of scaffolding proteins, suggesting that FliL acts as a scaffold. The Flil_C domain is capable of forming a ring assembly with an inner diameter that is comparable in size to the stator unit.
Jiyao W et al.(2023). "The conserved domain database in 2023.",