Lack of AHL-based quorum sensing in Pseudomonas fluorescens isolated from milk
AUTOR(ES)
Martins, Maurilio L., Uelinton, M. Pinto, Riedel, Kathrin, Vanetti, Maria C.D., Mantovani, Hilário C., Araújo, Elza F. de
FONTE
Braz. J. Microbiol.
DATA DE PUBLICAÇÃO
2014-09
RESUMO
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.
Documentos Relacionados
- The proteolytic activity of Pseudomonas fluorescens 07A isolated from milk is not regulated by quorum sensing signals
- Caracterização de protease e lipase de Pseudomonas fluorescens e quorum sensing em bactérias psicrotróficas isoladas de leite
- Milk-deteriorating exoenzymes from Pseudomonas fluorescens 041 isolated from refrigerated raw milk
- Quorum sensing signaling molecules in biofilms formed by psychrotrophic bacteria isolated from milk
- Vfr controls quorum sensing in Pseudomonas aeruginosa.