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In order to examine the immunochemistry of the core-lipid A region of Pseudomonas aeruginosa lipopolysaccharide (LPS), monoclonal antibodies (MAbs) specific for this region were produced in mice. Immunogen was prepared by coating a rough mutant of P. aeruginosa with column-purified core oligosaccharide fractions in order to enhance the immune response to the LPS core-lipid A region. Fourteen hybridoma clones were isolated, characterized, and further divided into three groups on the basis of their reactivities to rough LPS antigens in both enzyme-linked immunosorbent assays and Western immunoblots. In addition, another MAb, 18-19, designated group 1, was included in this study for defining core-lipid A epitopes. MAb 18-19 recognizes the LPS core-plus-one O-repeat unit of the serologically cross-reactive P. aeruginosa O2, O5, and O16. Group 2 MAbs are specific for the LPS outer core region and reacted with P. aeruginosa O2, O5, O7, O8, O10, O16, O18, O19, and O20, suggesting that these serotypes share a common outer core type. Group 3 MAbs recognize the inner core region and reacted with all 20 P. aeruginosa serotypes as well as with other Pseudomonas species, revealing the conserved nature of this region. Group 4 MAbs are specific for lipid A and reacted with all gram-negative organisms tested. Immunoassays using these MAbs and well-defined rough mutants, in addition to the recently determined P. aeruginosa core structures, have allowed us to precisely define immunodominant epitopes within the LPS core region.

Monoclonal antibodies that distinguish inner core, outer core, and lipid A regions of Pseudomonas aeruginosa lipopolysaccharide