Quorum Sensing Controls Swarming Motility of Burkholderia glumae through Regulation of Rhamnolipids.

Arvin Nickzad (1) , François Lépine (1) , Eric Déziel (1)

1 INRS-IAF - Institut Armand Frappier

Burkholderia glumae is a plant pathogenic bacterium that uses an acyl-homoserine lactone-mediated quorum sensing system to regulate protein secretion, oxalate production and major virulence determinants such as toxoflavin and flagella. B. glumae also releases surface-active rhamnolipids. In Pseudomonas aeruginosa and Burkholderia thailandensis, rhamnolipids, along with flagella, are required for the social behavior called swarming motility. In the present study, we demonstrate that quorum sensing positively regulates the production of rhamnolipids in B. glumae and that rhamnolipids are necessary for swarming motility also in this species. We show that a rhlA- mutant, which is unable to produce rhamnolipids, loses its ability to swarm, and that this can be complemented by providing exogenous rhamnolipids. Impaired rhamnolipid production in a quorum sensing-deficient B. glumae mutant is the main factor responsible for its defective swarming motility behaviour.

Domaines: Sciences du Vivant [q-bio]

Arvin Nickzad, François Lépine, Eric Déziel. Quorum Sensing Controls Swarming Motility of Burkholderia glumae through Regulation of Rhamnolipids.. PLoS ONE, 2015, 10 (6), pp.e0128509. ⟨10.1371/journal.pone.0128509⟩. ⟨pasteur-01352619⟩