The sweet spot of flagellar assembly

To build the machinery that enables bacteria to swim the flagellum is assembled piece by piece, ending with the helix called flagellar filament, composed of six different subunits called flagellins. Microbiologists have demonstrated that adding sugar to the flagellins is crucial for the flagellum’s assembly and functionality. Among the six flagellins, one is the special one serving a signalling role to trigger the final assembly of the flagellum.