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. 1988 May;26(5):821–826. doi: 10.1128/jcm.26.5.821-826.1988

Comparative immunochemistry of lipopolysaccharides from typable and polyagglutinable Pseudomonas aeruginosa strains isolated from patients with cystic fibrosis.

A Fomsgaard 1, R S Conrad 1, C Galanos 1, G H Shand 1, N Høiby 1
PMCID: PMC266467  PMID: 3133386

Abstract

Lipopolysaccharide (LPS) was extracted and purified from three Pseudomonas aeruginosa strains isolated from the infected lungs of patients with cystic fibrosis. Two of the strains could be typed by O-specific antibody (O:3 and O:9), and the third was polyagglutinable (O:3/9). The separated LPS was characterized by chemical and serological methods. The main neutral sugar constituents (glucose, rhamnose, and heptose) were found in various proportions in the three strains, whereas the amounts of glucosamine, galactosamine, ketodeoxyoctonate, and phosphate were more constant. Ester-bound C12, C16, 3-OH-C10, and 2-OH-C12, together with amide-bound 3-OH-C12, fatty acids were present in equimolar proportions in all three strains. Considerable amounts of LPS were liberated in the culture supernatant of the O:3 bacteria but not in those from the other two strains. This free LPS was shown to be immunologically identical to the cell-bound LPS and the extracted LPS. By sodium dodecyl sulfate-polyacrylamide gel electrophoresis, O:3 and O:9 LPS showed a ladder pattern characteristic of smooth LPS, while O:3/9 LPS appeared rough. Rabbit antisera used for O-typing were found by enzyme-linked immunosorbent assay to contain anti-LPS antibodies that reacted strongly with homologous LPS, moderately with O:3/9 LPS, and slightly with heterologous LPS. Immunoblotting showed that common antigenic determinants in the core-lipid A part were involved in the observed cross-reaction. The polyagglutinability of P. aeruginosa may be explained by the antibodies to these common determinants that arose from the partial absence of O polysaccharides.

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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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