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Infect Immun. Mar 1994; 62(3): 809–817.
PMCID: PMC186187

Characterization of lipopolysaccharide-deficient mutants of Pseudomonas aeruginosa derived from serotypes O3, O5, and O6.


Well-characterized rough mutants are important for the understanding of structures, functions, and biosynthesis of lipopolysaccharide (LPS) in gram-negative organisms. In this study, three series of Pseudomonas aeruginosa LPS-deficient mutants, namely PAC strains derived from serotype O3, AK strains derived from strain PAO1 (serotype O5), and serotype O6-derived mutants were subjected to biochemical analysis by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and silver staining as well as immunochemical characterization using LPS-specific monoclonal antibodies. The O-side-chain deficiency among the O6-derived mutants was also examined, and three mutants, A28, R5, and H4, were subsequently chosen for the elucidation of component sugars of the core structure of serotype O6 LPS. LPS of strain A28 has L-rhamnose and proportionally higher amounts of D-glucose, a feature shared by the O5-derived mutant, strain AK1401 (previously demonstrated as a mutant with a core-plus-one O repeat). In contrast strains R5 and H4 were shown to be devoid of L-rhamnose and have low and undetectable amounts of D-glucose, respectively, which indicated their core deficiency. The LPS-deficient or -sufficient characteristics of the P. aeruginosa strains examined correlated will with serum sensitivity data. This report represents a comprehensive analysis of rough mutants derived from O3 and O5 strains that have been used by others in many studies and a first look at the core oligosaccharide region of serotype O6 LPS obtained with the O6-derived mutants generated in this study.

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