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Bacterial Flagella

Updated: Nov 24


Writer: Dicle Dilan Yardimci


Many bacteria use helical motorized flagella to move across their environment. Ecoli cells contain many flagella that revolve in bundles, whereas rotor bacteria cells have only one flagellum. Each flagellum is made up of a helical filament that spins at a rate of 100 times per second and is 20 nanometers broad and up to 15 microns long. Speculative models and schema ties for how bacterial flagella might function and assemble. The filament is attached to a flexible revolving hook just outside the cell wall. The flagellum is made up of three parts: a filament, a hook, and a component termed the basal body that lies beneath the cell surface. A rod and a sequence of rings embedded in the inner membrane, peptidoglycan layer, and outer membrane make up the basal body.