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. 1985 Jun;48(3):776–781. doi: 10.1128/iai.48.3.776-781.1985

Characterization of two different antibody specificities recognizing distinct antigenic determinants in free lipid A of Escherichia coli.

L Brade, H Brade
PMCID: PMC261260  PMID: 2581900

Abstract

Antisera were raised in rabbits with acid-treated Re mutant bacteria from Salmonella minnesota and Escherichia coli and tested in a passive hemolysis assay with di- and monophosphorylated free lipid A of E. coli (LipA-Ac and LipA-HCl, respectively) coated onto sheep erythrocytes. Depending on the acid used to prepare the immunogen (acetic versus hydrochloric acid), different antibody specificities were obtained. Antiserum prepared against HCl-treated bacteria was found to react with both antigens to the same extent (i) in the passive hemolysis test, (ii) in the passive hemolysis inhibition test, and (iii) in absorption experiments, suggesting that antibodies in this antiserum recognize an antigenic determinant equally present in LipA-Ac and LipA-HCl. Antiserum raised against acetic acid-treated bacteria reacted with the homologous antigen (LipA-Ac) in the passive hemolysis and passive hemolysis inhibition test as well as in absorption experiments. However, the antiserum failed to react with the heterologous antigen (LipA-HCl) in the hemolysis test and during absorption, whereas in inhibition studies interaction of this antiserum with both antigens was observed. The inhibiting capacity of LipA-Ac was lower compared with that of LipA-HCl, indicating that the antigenic determinant of LipA-Ac is partly expressed by LipA-HCl in solution, but not when fixed on the surface of sheep erythrocytes. The role of glycosidically linked phosphate in lipid A is discussed with respect to antigenicity.

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Selected References

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