title: Lack of AHL-based quorum sensing in Pseudomonas fluorescens isolated from milk.
abstract: Numerous bacteria coordinate gene expression in response to small signalling molecules in many cases known as acylhomoserine lactones (AHLs), which accumulate as a function of cell density in a process known as quorum sensing. This work aimed to determine if phenotypes that are important to define microbial activity in foods such as biofilm formation, swarming motility and proteolytic activity of two Pseudomonas fluorescens strains, isolated from refrigerated raw milk, are influenced by AHL molecules. The tested P. fluorescens strains did not produce AHL molecules in none of the evaluated media. We found that biofilm formation was dependent on the culture media, but it was not influenced by AHLs. Our results indicate that biofilm formation, swarming motility and proteolytic activity of the tested P. fluorescens strains are not regulated by acyl-homoserine lactones. It is likely that AHL-dependent quorum sensing system is absent from these strains.
authors.affiliation: Instituto Federal de Educação Ciência e Tecnologia do Sudeste de Minas Gerais Campus Rio Pomba Belo HorizonteMG Brazil Instituto Federal de Educação, Ciência e Tecnologia do Sudeste de Minas Gerais, Campus Rio Pomba, Belo Horizonte, MG, Brazil.
authors.forename: Maurilio L
authors.initials: ML
authors.lastname: Martins
authors.affiliation: Departamento de Alimentos Universidade Federal de Ouro Preto Ouro PretoMG Brazil Departamento de Alimentos, Universidade Federal de Ouro Preto, Ouro Preto, MG, Brazil.
authors.forename: Uelinton M
authors.initials: UM
authors.lastname: Pinto
authors.affiliation: Institute of Microbiology Ernst-Moritz-Arndt University of Greifswald Germany Institute of Microbiology Ernst-Moritz-Arndt University of Greifswald, Germany.
authors.forename: Kathrin
authors.initials: K
authors.lastname: Riedel
authors.affiliation: Departamento de Microbiologia Universidade Federal de Viçosa ViçosaMG Brazil Departamento de Microbiologia, Universidade Federal de Viçosa, Viçosa, MG, Brazil.
authors.forename: Maria C D
authors.initials: MC
authors.lastname: Vanetti
authors.affiliation: Departamento de Microbiologia Universidade Federal de Viçosa ViçosaMG Brazil Departamento de Microbiologia, Universidade Federal de Viçosa, Viçosa, MG, Brazil.
authors.forename: Hilário C
authors.initials: HC
authors.lastname: Mantovani
authors.affiliation: Departamento de Microbiologia Universidade Federal de Viçosa ViçosaMG Brazil Departamento de Microbiologia, Universidade Federal de Viçosa, Viçosa, MG, Brazil.
authors.forename: Elza F
authors.initials: EF
authors.lastname: de Araújo
mesh_terms: D054742:Acyl-Butyrolactones / Q000378:metabolism*; D000818:Animals; D018441:Biofilms / Q000254:growth & development; D008124:Locomotion; D008892:Milk / Q000382:microbiology*; D059748:Proteolysis; D011551:Pseudomonas fluorescens / Q000302:isolation & purification* / Q000502:physiology*; D053038:Quorum Sensing
chemical_list: D054742:Acyl-Butyrolactones
keywords: Pseudomonas fluorescens; biofilm formation; milk; quorum quenching; quorum sensing