Accession Number : AD0781687

Title :   Chemical Comparison of the Polysaccharide Portions of Shigella Lipopolysaccharides and Their Relation to Virulence.

Descriptive Note : Annual summary rept. 1 Mar 73-30 Jun 74,


Personal Author(s) : Koeltzow,Donald E.

Report Date : 30 JUN 1974

Pagination or Media Count : 15

Abstract : Lipopolysaccharides (LPS) were extracted from virulent and avirulent strains of Shigella flexneri 2a, S. flexneri 1b, S. sonnei, and E. coli - S. flexneri hybrids in an effort to determine if the difference in virulence could be explained by chemical differences in the polysaccharide portion of the lipopolysaccharides. Comparison of the monosaccharide content of LPS from virulent and avirulent strains showed no major differences in the chemical content of this portion of the LPS which could explain their difference in virulence. However, comparison of the monosaccharide content of LPS from organisms grown on Brain-Heart Infusion (BHI) agar with that from organisms grown in BHI broth showed a five fold increase in the length of the O side chains of both virulent and avirulent agar grown cells. The polysaccharide component of the LPS is essentially identical in both the virulent and avirulent organisms studied. (Modified author abstract)

Descriptors :   *Shigella, *Polysaccharides, *Virulence, Bacteria, Biochemistry, Pathogenic microorganisms

Subject Categories : Biochemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE