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. 1987 Aug;169(8):3531–3538. doi: 10.1128/jb.169.8.3531-3538.1987

Visualization of Pseudomonas aeruginosa O antigens by using a protein A-dextran-colloidal gold conjugate with both immunoglobulin G and immunoglobulin M monoclonal antibodies.

J S Lam, M Y Lam, L A MacDonald, R E Hancock
PMCID: PMC212429  PMID: 2440850

Abstract

Two lipopolysaccharide O-antigen-specific monoclonal antibodies, MA1-8 (an immunoglobulin G1 [IgG1]) and MF15-4 (an IgM), were used to localize the O antigen of the lipopolysaccharide of Pseudomonas aeruginosa PAO1. A protein A-dextran-gold conjugate with an average particle diameter of 12.5 nm was used to label bacterial cells treated with MA1-8, while a second antibody (goat anti-mouse IgM) was required before the same probe could interact with cells treated with the IgM antibody MF15-4. Both antibodies resulted in exclusive labeling of the surface of P. aeruginosa PAO1 but not that of an isogenic O-antigen-lacking rough mutant. When the monoclonal antibodies became attached to the cell surface of P. aeruginosa PAO1, resulting in an even coating, the foldings and other topographic details could not be discerned by negative staining. In thin sections of monoclonal-antibody-treated bacteria, a 20- and a 30- to 40-nm thick amorphous layer was observed around the outside of the outer membrane when MA1-8 (IgG) and MF15-4 (IgM) plus goat anti-mouse IgM antibodies were used, respectively. This amorphous layer presumably resulted from the stabilization of the lipopolysaccharide structure by the monoclonal antibodies which prevented the long O-antigen chains from collapsing owing to dehydration.

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