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Infect Immun. 1991 February; 59(2): 700-704

Pseudomonas aeruginosa recognizes carbohydrate chains containing type 1 (Gal beta 1-3GlcNAc) or type 2 (Gal beta 1-4GlcNAc) disaccharide units.

Department of Medicine, University of Florida, Gainesville 32610.

ABSTRACT

The adhesion of Pseudomonas aeruginosa to type 1 (Gal beta 1-3GlcNAc) and type 2 (Gal beta 1-4GlcNAc) disaccharide determinants was studied in a microtiter adhesion assay and a thin-layer chromatography bacterial overlay assay. The oligosaccharides were prepared from human breast milk and human urine and were conjugated to hexadecylaniline to form neoglycolipids that were used in were used in the assays. Both the mucoid and the nonmucoid strains that were studied recognized the disaccharide determinants Sialylation of the oligosaccharides did not suppress binding in the thin-layer chromatography assay, but alpha 2-6-linked sialic acid blocked binding in the microtiter assay. The use of bovine serum albumin instead of gelatin as a blocking agent against nonspecific binding completely suppressed binding in the thin-layer chromatography assay. Isogenic nonpiliated mutants of nonmucoid strains constructed by interrupting the pilin gene retained their adhesive capacity for the disaccharide units, indicating that binding to the disaccharides was mediated by a nonpilus adhesin(s). Furthermore, two monoclonal antibodies that recognize the type 2 disaccharide determinant (Gal beta 1-4GlcNAc) partially inhibited adhesion of a pair of piliated and nonpiliated isogenic strains to mucin. This study suggests that P. aeruginosa utilizes a nonpilus adhesin(s) to bind to disaccharide units commonly found in mucins, in addition to pili and alginate, two previously described adhesins.

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