Send to

Choose Destination
Dis Aquat Organ. 1999 Oct 11;38(1):23-31.

Production of the 57 kDa major surface antigen by a non-agglutinating strain of the fish pathogen Renibacterium salmoninarum.

Author information

Department of Microbiology, University of Guelph, Ontario, Canada.


The major surface antigen of Renibacterium salmoninarum, p57, is associated with cell autoagglutination and implicated as a virulence factor in fish infections. An autoagglutinating strain, JD24, caused 92% mortality when 2 x 10(7) cells were injected intraperitoneally into rainbow trout Oncorhynchus mykiss, while a non-agglutinating strain, MT 239, produced only 7% mortality after 100 d. The p57 antigen was present in the supernates of broth cultures of both strains when examined by western immunoblotting, and the gene for p57 was detected in both strains by PCR. Electron microscopy of cryopreserved thin sections showed an amorphous layer associated with the cell surface of JD24 which was not seen with MT 239. While p57 from JD24 could reassociate with cells of both strains, p57 from MT 239 failed to restore haemagglutination activity to either strain. Biotinylation of bacterial surfaces demonstrated the presence of a carbohydrate component of p57 from JD24 which was absent from the p57 produced by MT 239. The higher virulence of JD24 may depend not only on the production of p57, but also its direct association with the bacterial cell surface.

[Indexed for MEDLINE]
Free full text

Publication types, MeSH terms, Substances

Supplemental Content

Full text links

Icon for Inter-Research Science Center
Loading ...
Support Center