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. 1993 Aug;175(16):5117–5128. doi: 10.1128/jb.175.16.5117-5128.1993

Pseudomonas aeruginosa lipopolysaccharide: evidence that the O side chains and common antigens are on the same molecule.

K Hatano 1, J B Goldberg 1, G B Pier 1
PMCID: PMC204978  PMID: 7688717

Abstract

We investigated whether Pseudomonas aeruginosa produces two distinct lipopolysaccharides (LPS) containing either serologically variable O side chains or a neutral polysaccharide common antigen, designated A bands, that reacts with monoclonal antibody (MAb) E87. Immunoprecipitation of LPS and free O side chains with O-side-chain-specific antibodies or MAb E87 resulted in coprecipitation of both polysaccharides when antibody of either specificity was employed. Chromatography of LPS and free O side chains in a disaggregating deoxycholate buffer indicated the two polysaccharide antigens cochromatograph when eluates were analyzed by sensitive and specific enzyme-linked immunosorbent assay inhibitions. The LPS from a mutant of strain PAO1 that lacks polymerized O side chains but retains the common antigen eluted in fractions containing smaller LPS molecules, indicating the necessity of polymerized O side chains for elution in early fractions containing large LPS monomers. A phosphomannomutase mutant of P. aeruginosa PAO1 makes a rough LPS lacking both O side chains and common antigen but still produces a small (< 6-kDa) common antigen component detectable in cell lysates. Introduction of the cloned pmm gene into this strain restored production of a smooth LPS expressing large MAb E87-reactive common antigen. Destruction with NaOH of O side chains on recombinant LPS molecules eluting early from the molecular sieve column resulted in a shift of the MAb E87-reactive antigen to the late-eluting fractions. These results indicate that on most P. aeruginosa LPS molecules, O side chains and neutral polysaccharide common antigens are both present.

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Selected References

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