Expression of ExsA in trans confers type III secretion system-dependent cytotoxicity on noncytotoxic Pseudomonas aeruginosa cystic fibrosis isolates.
Twelve Pseudomonas aeruginosa cystic fibrosis isolates that are not able to exert a type III secretion system (TTSS)-dependent cytotoxicity towards phagocytes have been further studied. The strains, although possessing TTSS genes and exsA, which encodes a positive regulator of the TTSS regulon, showed no transcriptional activation of the exsCBA regulatory operon. The expression of exsA in trans restored the in vitro secretion of TTSS proteins and ex vivo cytotoxicity.
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Département de Biologie Moléculaire et Structurale, BBSI, UMR 5092 CNRS, CEA Grenoble, 38054 Grenoble Cedex 09, France.
Attree
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Toussaint
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D001426:Bacterial Proteins; D003550:Cystic Fibrosis / Q000382:microbiology*; D004268:DNA-Binding Proteins / Q000235:genetics*; D006801:Humans; D008264:Macrophages / Q000502:physiology; D009504:Neutrophils / Q000502:physiology; D009876:Operon; D011550:Pseudomonas aeruginosa / Q000472:pathogenicity*; D015534:Trans-Activators / Q000235:genetics*
D001426:Bacterial Proteins; D004268:DNA-Binding Proteins; C095092:ExsA protein, bacteria; D015534:Trans-Activators