Journal
JOURNAL OF BACTERIOLOGY
Volume 188, Issue 23, Pages 8213-8221Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/JB.01202-06
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Funding
- NHLBI NIH HHS [R01 HL058334, HL58334] Funding Source: Medline
- NIAID NIH HHS [R21 AI061396, R56 AI061396, AI061396, R01 AI061396] Funding Source: Medline
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The ability to form biofilms in the airways of people suffering from cystic fibrosis is a critical element of Pseudomonas aeruginosa pathogenesis. The 15-gene psl operon encodes a putative polysaccharide that plays an important role in biofilm initiation in nonmucoid P. aeruginosa strains. Biofilm initiation by a P. aeruginosa PAO1 strain with disruption of pslA and pslB (Delta pslAB) was severely compromised, indicating that psl has a role in cell-surface interactions. In this study, we investigated the adherence properties of this Delta pslAB mutant using biotic surfaces (epithelial cells and mucin-coated surfaces) and abiotic surfaces. Our results showed that psl is required for attachment to a variety of surfaces, independent of the carbon source. To study the potential roles of Psi apart from attachment, we generated a psl-inducible P. aeruginosa strain (Delta psl/p(BAD)-psl) by replacing the psl promoter region with araC-p(BAD), so that expression of psl could be controlled by addition of arabinose. Analysis of biofilms formed by the Delta psl/p(BAD)-psl strain indicated that expression of the psl operon is required to maintain the biofilm structure at steps postattachment. Overproduction of the Psl polysaccharide led to enhanced cell-surface and intercellular adhesion of P. aeruginosa. This translated into significant changes in the architecture of the biofilm. We propose that Psi has an important role in P. aeruginosa adhesion, which is critical for initiation and maintenance of the biofilm structure.
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