Journal
MOLECULAR MICROBIOLOGY
Volume 78, Issue 1, Pages 158-172Publisher
WILEY
DOI: 10.1111/j.1365-2958.2010.07320.x
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Funding
- National Science Foundation [MCB0822405]
- National Institutes of Health (NIH) [RO1 A1077628, GM066794, GM059969]
- Public Health Service [AI061396, HL58334]
- US Department of Agriculture Current Research Information System [FLA-MCS-004949]
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P>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 sigma-factor RpoS is a positive transcriptional regulator of psl gene expression. Furthermore, we show that psl mRNA has an extensive 5' untranslated region, to which the post-transcriptional regulator RsmA binds and represses psl translation. Our observations suggest that upon binding RsmA, the region spanning the ribosome binding site of psl mRNA folds into a secondary stem-loop structure that blocks the Shine-Dalgarno sequence, preventing ribosome access and protein translation. This constitutes a novel mechanism for translational repression by this family of regulators.
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