Bacteria slingshot more on soft surfaces

Rongrong Zhang, Lei Ni, Zhenyu Jin, Jiahong Li, Fan Jin
2014 Nature Communications  
Adaptive responses greatly improve the competitive capacities of bacteria in diverse environments. Here, we investigate whether bacteria can adapt to a microenvironment with distinctive softness by examining the type-IV pili (TFP)-mediated motility of Pseudomonas aeruginosa cells on brush-like surfaces that are grafted with a layer of thermally sensitive polymer chains, where the softness of the brush-layer is tunable by applying a small temperature change (from 30 to 37°C). We report that P.
more » ... ruginosa cells slingshot more on soft surfaces at a shear-thinning condition, which greatly facilitates their surface crawling by means of reducing energy dissipation. This adaptive response suggests that P. aeruginosa cells may be able to sense the local viscoelasticity and then deploy TFP to adapt to their physical surroundings.
doi:10.1038/ncomms6541 pmid:25412641 pmcid:PMC4263163 fatcat:6bqiibl6endc7ktkbmh5y6rxmq