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. 1986 Nov;168(2):799–804. doi: 10.1128/jb.168.2.799-804.1986

Biochemical and immunochemical properties of the cell surface of Renibacterium salmoninarum.

F Fiedler, R Draxl
PMCID: PMC213555  PMID: 3782026

Abstract

The biochemical composition of the cell envelope of Renibacterium salmoninarum was investigated in a total of 13 strains isolated from different salmonid fish species at various geographical locations of the United States, Canada, and Europe. A marked similarity with the type strain R. salmoninarum ATCC 33209 was found both in the peptidoglycan and the cell wall polysaccharide. The primary structure of the peptidoglycan was found to be consistent with lysine in the third position of the peptide subunit, a glycyl-alanine interpeptide bridge between lysine and D-alanine of adjacent peptide subunits, and a D-alanine amide substituent at the alpha-carboxyl group of D-glutamic acid in position 2 of the peptide subunit. The cell wall polysaccharide contained galactose as the major sugar component which was accompanied by rhamnose, N-acetylglucosamine, and N-acetylfucosamine. The polysaccharide amounted to more than 60% of the dry weight of the cell walls. It was found to be covalently linked to the peptidoglycan and was released by hot formamide treatment. On gel filtration chromatography the extracted polysaccharide behaved like a homogeneous polymeric compound. The purified cell wall polysaccharide showed antigenic activity with antiserum obtained by immunization of rabbits with heat-inactivated trypsinized cells of R. salmoninarum. Immunoblotting experiments with nontrypsinized cell walls and antisera raised against R. salmoninarum cells revealed that antigenic proteins were attached to the cell walls.

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Selected References

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