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. 1987 Sep;55(9):2026–2031. doi: 10.1128/iai.55.9.2026-2031.1987

Antigenic and structural differences among six proteins II expressed by a single strain of Neisseria gonorrhoeae.

D S Barritt, R S Schwalbe, D G Klapper, J G Cannon
PMCID: PMC260650  PMID: 3114142

Abstract

Gonococci express a family of related outer membrane proteins designated protein II (P.II), which undergo both phase and antigenic variation. Six P.II proteins have been identified in strain FA1090. We developed monoclonal antibodies specific for each P.II protein. Using these antibodies as probes, we purified the six different P.II proteins of this strain. Despite the relatedness of the proteins, we could not purify all of them by a single purification scheme. Four P.II proteins were purified by chromatofocusing, and the remaining two proteins were purified by hydrophobic interaction chromatography on phenyl-Sepharose. The N-terminal amino acid sequence of the proteins showed a high degree of sequence conservation. However, there was variability at specific amino acid residues, giving each P.II protein a unique N-terminal amino acid sequence. Thus P.II proteins of one strain differ among themselves not only in antigenic determinants and primary structure, but also in other characteristics affecting their properties in different chromatographic systems.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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