Lack of AHL-based quorum sensing in Pseudomonas fluorescens isolated from milk.
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Date
2014
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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.
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Keywords
Milk, Pseudomonas fluorescens, Biofilm formation, Quorum sensing
Citation
MARTINS, M. L. et al. Lack of AHL-based quorum sensing in Pseudomonas fluorescens isolated from milk. Brazilian Journal of Microbiology, v. 45, p. 1039-1046, 2014. Disponível em: <http://www.scielo.br/pdf/bjm/v45n3/37.pdf>. Acesso em: 21 out. 2015.