Ligand and pathogen specificity of the Atlantic salmon serum C-type lectin |
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Authors: | Elke Uribe Thomas J. Steele Robert C. Richards K. Vanya Ewart |
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Affiliation: | 1. Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, NS, Canada B3H 1X5;2. Aquatic and Crop Resource Development, National Research Council of Canada, 1411 Oxford St., Halifax, NS, Canada B3H 3Z1 |
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Abstract: | BackgroundAn Atlantic salmon (Salmo salar) C-type lectin (SSL) binds to mannose and related sugars as well as to the surface of Aeromonas salmonicida. To characterize this lectin as a pathogen recognition receptor in salmon, aspects of its interaction with molecules and with intact pathogens were investigated.MethodsSSL was isolated using whole-yeast-affinity and mannan-affinity chromatography. The binding of SSL to the two major surface molecules of A. salmonicida, lipopolysaccharide (LPS) and A-layer protein was investigated by western blotting and enzyme-linked immunosorbent assays. Microbial binding specificity of SSL was examined by whole cell binding assays using a range of species. Carbohydrate ligand specificity of SSL was examined using glycan array analysis and frontal affinity chromatography.ResultsSSL showed binding to bacteria and yeast including, Pseudomonas fluorescens, A. salmonicida, A. hydrophila, Pichia pastoris, and Saccharomyces cerevisiae, but there was no detectable binding to Yersinia ruckeri. In antimicrobial assays, SSL showed no activity against Escherichia coli, Bacillus subtilis, S. cerevisiae, or A. salmonicida, but it was found to agglutinate E. coli. The major surface molecule of A. salmonicida recognized by SSL was shown to be LPS and not the A-layer protein. LPS binding was mannose-inhibitable. Glycans containing N-acetylglucosamine were shown to be predominant ligands.ConclusionSSL has a distinct ligand preference while allowing recognition of a wide variety of related carbohydrate structures.General SignificanceSSL is likely to function as a wide-spectrum pattern recognition protein. |
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Keywords: | Atlantic salmon Salmo salar C-type lectin Glycan array Lipopolysaccharide Pathogen recognition |
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