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. 1990 Apr;58(4):1030–1037. doi: 10.1128/iai.58.4.1030-1037.1990

Growth-dependent alterations in production of serotype-specific and common antigen lipopolysaccharides in Pseudomonas aeruginosa PAO1.

E J McGroarty 1, M Rivera 1
PMCID: PMC258578  PMID: 2108085

Abstract

Pseudomonas aeruginosa PAO1 was grown in various media and at different temperatures, and the heterogeneity of the extracted lipopolysaccharide (LPS) was characterized by polyacrylamide gel electrophoresis. The size distributions of the serotype-specific LPS and the common antigen LPS were analyzed on Western blots (immunoblots). Cells grown at high, near-growth-limiting temperatures, at low pH, in low concentrations of phosphate, or in high concentrations of NaCl, MgCl2, glycerol, or sucrose produced decreased amounts of the very long chain population of O-antigen LPS molecules. Lower temperatures and lowered glycerol, lowered sucrose, low sulfate, lower salt concentrations, and elevated pH did not significantly affect the level of this LPS population. The size and amount of common antigen LPS was either unaffected or increased slightly when the cells were grown under the above stress conditions. Cells grown under normal, nonstressed conditions were agglutinated only by serotype-specific antibodies. In contrast, cells grown under stress conditions, in which the long-O-polymer LPS was absent, were agglutinated by both serotype-specific and common antigen-specific antibodies. The results indicate that the long O polymers cover and mask the shorter common antigen. However, specific growth conditions limit the production of the long O polymer, allowing the exposure and reactivity of the common antigen on the cell surface.

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