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. 1988 Feb;56(2):499–504. doi: 10.1128/iai.56.2.499-504.1988

Selection and immunochemical analysis of lipooligosaccharide mutants of Neisseria gonorrhoeae.

K C Dudas 1, M A Apicella 1
PMCID: PMC259310  PMID: 3123395

Abstract

The identification of enterobacterial mutants that contain alterations in the lipopolysaccharide (LPS) oligosaccharide core structure facilitated the development of the model of the physicochemical and immunochemical structures of enteric LPS. Results of recent immunochemical studies have suggested that the structural model of the lipooligosaccharides (LOSs) of Neisseria gonorrhoeae may differ from the enteric LPS model. The difficulties in the analysis of the wild-type gonococcal LOS have precluded understanding of the precise nature of the LOS structure. This study was undertaken to isolate a series of mutants of N. gonorrhoeae 1291 that had sequential saccharide deletions in the LOS. Results of preliminary studies suggested that the pyocin, designated pyocin C, allowed selection of gonococci with such mutant LOS structures. Results also indicated that the receptor for pyocin C binding was an LOS component. Pyocin C selection led to the isolation of five strains with LOS patterns on sodium dodecyl sulfate-polyacrylamide gels which differed from the LOS of parent strain 1291. In this system, the Mr of the parent LOS was 4,715, while the LOSs from the mutant strains demonstrated progressive saccharide deletions, with Mrs of 4,230, 4,089, 3,627, 3,262, and 3,197. Protein patterns of these mutants on sodium dodecyl sulfate-polyacrylamide gels were qualitatively similar to those of the parent strains. Results of studies with five monoclonal antibodies specific for neisserial LOS indicated that shared as well as unique epitopes were present on the mutant LOSs. Results of ketodeoxyoctonate analysis of the mutant LOSs indicated that the majority of the ketodeoxyoctonate residues may be substituted on C-4 or C-5. Chemical and immunological analysis of such LOS mutants should expedite the development of the model for the structure of gonococcal LOS.

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Selected References

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