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. 1994 Dec;176(23):7129–7139. doi: 10.1128/jb.176.23.7129-7139.1994

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

T R de Kievit 1, J S Lam 1
PMCID: PMC197099  PMID: 7525538

Abstract

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.

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