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By Nader Hassanzadeh

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55 56 Flagellum fine structure From Berry and Armitage,1999 57 Some of the genes and gene products involves in the assembly of the flagellum 58 Flagellum fine structure Flagellins are immunogenic and constitute a group of protein antigens called the H antigens, which are characteristic of a given species, strain, or variant of an organism. 59 Mechanism of flagellar rotatory motor and locomotion     Each flagellum rotates 360º around a central axis and affects the surrounding medium much as a ship's propeller would.

48 Bacterial motility Speed of movement     How fast do bacterial cells move? 00015 kilometers/hr. This may seems slow but remember their tiny size. Table demonstrates a better comparison. Paustain,2001 49 Flagellum structure  1. 2. 3. Composed of three parts: Filament: Composed of flagellin proteins twisted together in a helical conformation. Hook: Transition between filament and motor. Basal body: Anchor in cell wall and motor. 50 Flagellum structure  In a prokaryotic flagellum, chains of a globular protein are wound in a tight spiral to form a filament, which is attached to another protein (the hook), which is inserted into the basal apparatus.

In the absence of net movement, cells were observed to flex. This can be easily shown when superimposing two images that were recorded at different times. Dark areas indicate overlap of the cell during both recordings, and lighter areas show displacement of cell sections. Spormann,1999 42 Gliding bacteria M yx ococcus x anthus          The time difference between the two superimposed images was: 1 min 48 s for the picture at top left (size bar included), 1 min 10 s for the picture at bottom left, 7 s for the picture at top right, and 27 s for the picture at bottom right.

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