Abstract

Myxococcus xanthus, a gram-negative soil bacterium, glides over solid surfaces with two independent motility mechanisms termed social (S) and adventurous (A) motility. S-motility has been shown to be powered by the extrusion, adhesion and retraction of type IV pili. A-motility, however, is much less well understood. Two main models have been proposed to explain A-motility. The first, the “slime gun” model, implicates the secretion of polyelectrolyte slime from the cell pole, pushing a cell forward.

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