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. 1981 Jan;31(1):214–222. doi: 10.1128/iai.31.1.214-222.1981

Immunochemical characterization of Brucella lipopolysaccharides and polysaccharides.

E Moreno, S L Speth, L M Jones, D T Berman
PMCID: PMC351772  PMID: 6163716

Abstract

Purified lipopolysaccharide (LPS) extracted with phenol-water from smooth Brucella abortus was hydrolyzed with 1% acetic acid at 100 degrees C. The degraded polysaccharide (AH) released gave reactions of identity with the native polysaccharide hapten (NH) in phenol-water- or trichloroacetic acid-extracted endotoxin preparations of B. abortus and with the polysaccharide (poly B) extracted by trichloroacetic acid from rough B. melitensis strain B115. Poly B was present in the soluble cytoplasmic fraction but not in the membrane fraction, of disrupted B115 cells. It could not be extracted from three rough mutants of B. abortus or from B canis or B. ovis cells. Both AH and NH shared determinants present on smooth LPS and missing from poly B. Sugars found in purified LPS, NH, and AH included mannose, glucose, quinovosamine, glucosamine, and 2-keto-3-deoxyoctonate. Poly B contained only a trace amount of quinovosamine and no 2-keto-3-deoxyoctonate detectable by the thiobarbiturate assay. Sera from some rabbits immunized with pure smooth LPS and some, but not all, cows infected with field strains of B. abortus recognized the determinants missing from poly B. A subclass-specific enzyme-linked immunoassay showed that most of the antibody in sera from infected cows which binds to smooth LPS and to NH is of the immunoglobulin G1 subclass.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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