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Multiple roles of Pseudomonas aeruginosa TBCF10839 PilY1 in motility, transport and infection


Bohn, Y S; Brandes, G; Rakhimova, E; Horatzek, S; Salunkhe, P; Munder, A; van Barneveld, A; Jordan, D; Bredenbruch, F; Häußler, S; Riedel, K; Eberl, L; Jensen, P O; Bjarnsholt, T; Moser, C; Hoiby, N; Tümmler, B; Wiehlmann, L (2008). Multiple roles of Pseudomonas aeruginosa TBCF10839 PilY1 in motility, transport and infection. Molecular Microbiology, 71(3):730-747.

Abstract

Summary Polymorphonuclear neutrophils are the most important mammalian host defense cells against infections with Pseudomonas aeruginosa. Screening of a STM library of the non-piliated P. aeruginosa strain TBCF10839 uncovered that transposon inactivation of its pilY1 gene rendered the bacterium more resistant against killing by neutrophils than the wild type and any other of the more than 3,000 tested mutants. Inactivation of pilY1 led to the loss of twitching motility in twitching-proficient wild type PA14 and PAO1 strains, predisposed to autolysis and impaired the secretion of quinolones and pyocyanin, but on the other hand promoted growth in stationary phase and bacterial survival in murine airway infection models. The PilY1 population consisted of a major full-length and a minor shorter PilY1* isoform. PilY1* was detectable in small extracellular quinolone-positive aggregates, but not in the pilus. P. aeruginosa PilY1 is not an adhesin on the pilus tip, but assists in pilus biogenesis, twitching motility, secretion of secondary metabolites and in the control of cell density in the bacterial population.

Summary Polymorphonuclear neutrophils are the most important mammalian host defense cells against infections with Pseudomonas aeruginosa. Screening of a STM library of the non-piliated P. aeruginosa strain TBCF10839 uncovered that transposon inactivation of its pilY1 gene rendered the bacterium more resistant against killing by neutrophils than the wild type and any other of the more than 3,000 tested mutants. Inactivation of pilY1 led to the loss of twitching motility in twitching-proficient wild type PA14 and PAO1 strains, predisposed to autolysis and impaired the secretion of quinolones and pyocyanin, but on the other hand promoted growth in stationary phase and bacterial survival in murine airway infection models. The PilY1 population consisted of a major full-length and a minor shorter PilY1* isoform. PilY1* was detectable in small extracellular quinolone-positive aggregates, but not in the pilus. P. aeruginosa PilY1 is not an adhesin on the pilus tip, but assists in pilus biogenesis, twitching motility, secretion of secondary metabolites and in the control of cell density in the bacterial population.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Plant and Microbial Biology
Dewey Decimal Classification:580 Plants (Botany)
Language:English
Date:December 2008
Deposited On:08 Jan 2009 12:14
Last Modified:05 Apr 2016 12:47
Publisher:Wiley-Blackwell
ISSN:0950-382X
Publisher DOI:10.1111/j.1365-2958.2008.06559.x
PubMed ID:19054330

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