Ligand and pathogen specificity of the Atlantic salmon serum C-type lectin

  1. Get@NRC: Ligand and pathogen specificity of the Atlantic salmon serum C-type lectin (Opens in a new window)
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Journal titleBiochimica et Biophysica Acta (BBA) - General Subjects
Pages21292138; # of pages: 10
SubjectAtlantic salmon; Salmo salar; C-type lectin; Glycan array; Lipopolysaccharide; Pathogen recognition
AbstractBackground: An 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. Methods: SSL 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. Results: SSL 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. Conclusion: SSL has a distinct ligand preference while allowing recognition of a wide variety of related carbohydrate structures.
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AffiliationNational Research Council Canada; Aquatic and Crop Resource Development
Peer reviewedYes
NRC number54084
NPARC number21268163
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Record identifierf363072d-36c8-4adb-bb57-f8e6affda4d5
Record created2013-05-15
Record modified2016-05-09
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