Oligomerisation and carbohydrate binding in an Atlantic salmon serum C-type lectin consistent with non-self recognition

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DOIResolve DOI: http://doi.org/10.1016/j.fsi.2004.04.006
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TypeArticle
Journal titleFish and Shellfish Immunology
Volume17
Issue4
Pages315323; # of pages: 9
SubjectAtlantic salmon; C-type lectin; Serum; Phage-display antibody; Oligomerisation
AbstractA C-type lectin was previously isolated from the blood of healthy Atlantic salmon (Salmo salar) and this salmon serum lectin (SSL) was found to opsonise bacteria. Selective binding to bacteria in vivo requires that the lectin be able to recognise a carbohydrate pattern on the bacterial surface distinguishable from that of the host. In order to investigate this selectivity in the lectin, a phage-display antibody was prepared and then used for detection of lectin by Western blotting. A carbohydrate binding-inhibition assay with Western blot detection of the lectin showed mannose to be the primary ligand and related sugars including glucose, N-acetylglucosamine and methyl a--mannopyranoside to be additional ligands of this lectin. The SSL in serum detected by Western blotting was shown to form a complex oligomer. These results show that the salmon serum lectin is oligomeric in blood and that it recognizes a broad spectrum of carbohydrates with optimal binding to mannose. The lectin might therefore be an ideal opsonin for multiple salmon pathogens with carbohydrate arrays on their surfaces. No similar lectins were identified in the sera of other fish by Western blotting using the phage-display antibody. Molecular analysis will be required in order to determine whether homologous lectins are expressed in related fish species. It is anticipated that similar lectins might have related pathogen recognition roles in divergent fish species.
Publication date
PublisherElsevier
Copyright noticeCrown copyright © 2004
LanguageEnglish
AffiliationNRC Institute for Marine Biosciences; National Research Council Canada
Peer reviewedYes
NRC number1699
42435
NPARC number3538476
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Record identifieraf532767-3104-4ece-ae28-841a8c7dd977
Record created2009-03-01
Record modified2016-05-09
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