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• W2005587943 startingPage "e20888" @default.
• W2005587943 abstract "The importance of rhamnolipid to swarming of the bacterium Pseudomonas aeruginosa is well established. It is frequently, but not exclusively, observed that P. aeruginosa swarms in tendril patterns—formation of these tendrils requires rhamnolipid. We were interested to explain the impact of surface changes on P. aeruginosa swarm tendril development. Here we report that P. aeruginosa quorum sensing and rhamnolipid production is impaired when growing on harder semi-solid surfaces. P. aeruginosa wild-type swarms showed huge variation in tendril formation with small deviations to the “standard” swarm agar concentration of 0.5%. These macroscopic differences correlated with microscopic investigation of cells close to the advancing swarm edge using fluorescent gene reporters. Tendril swarms showed significant rhlA-gfp reporter expression right up to the advancing edge of swarming cells while swarms without tendrils (grown on harder agar) showed no rhlA-gfp reporter expression near the advancing edge. This difference in rhamnolipid gene expression can be explained by the necessity of quorum sensing for rhamnolipid production. We provide evidence that harder surfaces seem to limit induction of quorum sensing genes near the advancing swarm edge and these localized effects were sufficient to explain the lack of tendril formation on hard agar. We were unable to artificially stimulate rhamnolipid tendril formation with added acyl-homoserine lactone signals or increasing the carbon nutrients. This suggests that quorum sensing on surfaces is controlled in a manner that is not solely population dependent." @default.
• W2005587943 created "2016-06-24" @default.
• W2005587943 creator A5027204460 @default.
• W2005587943 creator A5051836187 @default.
• W2005587943 date "2011-06-07" @default.
• W2005587943 modified "2023-10-17" @default.
• W2005587943 title "Surface Hardness Impairment of Quorum Sensing and Swarming for Pseudomonas aeruginosa" @default.
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• W2005587943 doi "https://doi.org/10.1371/journal.pone.0020888" @default.
• W2005587943 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3110244" @default.
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• W2005587943 hasPublicationYear "2011" @default.
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