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Three Pseudomonas aeruginosa strains with different protease profiles

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The proteolytic activity of three Pseudomonas aeruginosa strains, ATCC 27853 - a reference strain, and two clinical isolates was tested. The activity was examined after culturing the bacteria in two different growth media: the minimal M9 medium and rich Luria-Bertani broth (LB). Based on zymograms and protease activity specific assays, it was concluded that the reference strain produced three proteolytic enzymes in the LB medium: protease IV, elastase B and elastase A, while alkaline protease was only produced in the M9 medium. The clinical isolates of P. aeruginosa produced elastase B and alkaline protease when grown in the LB medium and the minimal M9 medium, respectively. PCR analysis confirmed the presence of both the lasB gene encoding elastase B and aprA coding for alkaline protease in the genomes of the three P. aeruginosa strains analyzed. The expression of these genes coding for two important P. aeruginosa virulence factors was dependent on the growth conditions in all the strains studied. The contribution of the extracellular proteinases to the virulence of P. aeruginosa strains used in this study was investigated using an insect model, the greater wax moth Galleria mellonella.
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  • Department of Immunobiology, Maria Curie-Sklodowska University, Lublin, Poland
  • Department of Immunobiology, Maria Curie-Sklodowska University, Lublin, Poland
  • Department of Genetics and Microbiology, Maria Curie-Sklodowska University, Lublin, Poland
  • Department of Immunobiology, Maria Curie-Sklodowska University, Lublin, Poland
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