Eruginosa, pilus retraction pulls the cell forward; no movement is observed through pilus extension. As chemotaxis proteins handle pilus assembly and activity, CheY-like proteins may interact together with the PilB and/or PilT ATPases [Bertrand et al., 2010]. Variety IV pilus-mediated motility in M. xanthus is smooth and does not display twitching. Having said that, like twitching motility in P. a