Abstract
Twitching motility is a mode of flagella-independent surface translocation exhibited by Pseudomonas aeruginosa and other bacteria on solid media. All species exhibiting it carry thin pili, usually polar. This work shows that only PAO and K strains of P. aeruginosa with retractile (PSA) pili were able to move in this way, those with no pili or non-retractile pili remaining stationary. Specific agents such as anti-pilus serum, which prevents otherwise functional pili from retracting, also prevented twitching motility.
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