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. 1991 Apr;59(4):1278–1284. doi: 10.1128/iai.59.4.1278-1284.1991

Strain-specific and immunodominant surface epitopes of the P2 porin protein of nontypeable Haemophilus influenzae.

E M Haase 1, A A Campagnari 1, J Sarwar 1, M Shero 1, M Wirth 1, C U Cumming 1, T F Murphy 1
PMCID: PMC257839  PMID: 1706317

Abstract

The P2 porin protein is the major outer membrane protein of nontypeable Haemophilus influenzae. Five monoclonal antibodies to P2 of four strains of nontypeable H. influenzae were developed by immunizing mice with whole bacterial cells. All five antibodies recognized epitopes on P2 in immunoblot assays of whole organism lysates, purified outer membrane, and purified P2. Competitive enzyme-linked immunosorbent assays and immunoblot assays of cyanogen bromide-digested P2 showed that two antibodies to the P2 protein of strain 1479 recognized different epitopes on the molecule. Immunofluorescence and immunoelectron microscopy demonstrated that each of the five antibodies recognized epitopes that were abundantly expressed on the bacterial surface. Analysis of 120 H. influenzae strains indicated that three of the five antibodies were reactive exclusively with the homologous strain. The remaining two antibodies were reactive with less than 3% of the strains. These studies indicate that the P2 protein expresses a highly strain-specific and immunodominant epitope on the bacterial surface. The expression of strain-specific and immunodominant epitopes on the bacterial surface may represent a mechanism by which the bacterium induces antibodies that will protect against recurrent infection by the homologous strain but will not protect against infection by heterologous strains.

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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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