title: Biofilm-induced modifications in the proteome of Pseudomonas aeruginosa planktonic cells.
abstract: While recent studies focused on Quorum Sensing (QS) role in the cell-to-cell communication in free or biofilm cultures, no work has been devoted up to now to investigate the communication between sessile and planktonic bacteria. In this aim, we elaborated an original two-chambered bioreactor and used a proteomic approach to study the alterations induced by Pseudomonas aeruginosa biofilm cells on protein expression in planktonic counterparts (named SIPs for Surface-Influenced Planktonics). Proteomic analyses revealed the existence of 31 proteins whose amount varied in SIPs, among which five corresponded to hypothetic proteins and two (the Fur and BCP proteins) are involved in bacterial response to oxidative stress. An increase in the concentration of C(4)-HSL (rhlR-rhlI-dependent QS) and 3-oxo-C(12)-HSL (lasR-lasI-dependent QS) autoinducer molecules was shown in the planktonic compartment. Interestingly, among proteins that were accumulated by SIPs was 3-oxoacyl-[acyl-carrier-protein] reductase, a protein involved in the production of the autoinducer 3-oxo-C(12)-HSL. These results demonstrate that planktonic organisms are able to detect the presence of a biofilm in their close environment and to modify their gene expression in consequence.
authors.affiliation: CNRS UMR 6270 & FR 3038, University of Rouen, France.
authors.forename: Yohan
authors.initials: Y
authors.lastname: Nigaud
authors.forename: Pascal
authors.initials: P
authors.lastname: Cosette
authors.forename: Anthony
authors.initials: A
authors.lastname: Collet
authors.forename: Philippe Chan Tchi
authors.initials: PC
authors.lastname: Song
authors.forename: David
authors.initials: D
authors.lastname: Vaudry
authors.forename: Hubert
authors.initials: H
authors.lastname: Vaudry
authors.forename: Guy-Alain
authors.initials: GA
authors.lastname: Junter
authors.forename: Thierry
authors.initials: T
authors.lastname: Jouenne
mesh_terms: D064431:3-Oxoacyl-(Acyl-Carrier-Protein) Reductase; D015107:4-Butyrolactone / Q000031:analogs & derivatives / Q000378:metabolism / Q000494:pharmacology; D000429:Alcohol Oxidoreductases / Q000378:metabolism; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism*; D018441:Biofilms / Q000254:growth & development; D019149:Bioreactors; D015870:Gene Expression; D006714:Homoserine / Q000031:analogs & derivatives / Q000378:metabolism / Q000494:pharmacology; D018384:Oxidative Stress; D010933:Plankton / Q000254:growth & development / Q000378:metabolism; D020543:Proteome / Q000187:drug effects / Q000235:genetics / Q000378:metabolism*; D011550:Pseudomonas aeruginosa / Q000187:drug effects / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D053038:Quorum Sensing
chemical_list: D001426:Bacterial Proteins; C109860:N-(3-oxododecanoyl)homoserine lactone; C092312:N-butyrylhomoserine lactone; D020543:Proteome; D006714:Homoserine; D000429:Alcohol Oxidoreductases; D064431:3-Oxoacyl-(Acyl-Carrier-Protein) Reductase; D015107:4-Butyrolactone