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Extracellular polysaccharides are important components of biofilms. In non‐mucoid Pseudomonas aeruginosa strains, the Pel and Psl polysaccharides are major structural components of the biofilm matrix. In this study, we demonstrate that the alternative σ‐factor RpoS is a positive transcriptional regulator of psl gene expression. Furthermore, we show that psl mRNA has an extensive 5′ untranslated region,...
Pseudomonas aeruginosa, the principal pathogen of cystic fibrosis patients, forms antibiotic‐resistant biofilms promoting chronic colonization of the airways. The extracellular (EPS) matrix is a crucial component of biofilms that provides the community multiple benefits. Recent work suggests that the secondary messenger, cyclic‐di‐GMP, promotes biofilm formation. An analysis of factors specifically...
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