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. 1994 Aug;62(8):3178–3183. doi: 10.1128/iai.62.8.3178-3183.1994

Antigenic relationships among immunoglobulin A1 proteases from Haemophilus, Neisseria, and Streptococcus species.

H Lomholt 1, M Kilian 1
PMCID: PMC302943  PMID: 8039886

Abstract

To investigate the antigenic variation and relationships of immunoglobulin A1 (IgA1) proteases among different species and genera, we examined a comprehensive collection of serine type and metallo-type IgA1 proteases and corresponding antisera in enzyme neutralization assays. Sharing of neutralizing epitopes of metallo-type IgA1 proteases from Streptococcus pneumoniae, Streptococcus sanguis, Streptococcus mitis, and Streptococcus oralis and of serine type IgA1 proteases from Haemophilus and pathogenic Neisseria species was extremely limited. A number of limited to strong cross-reactions in such epitopes were found among serine type IgA1 proteases released by members of the genera Haemophilus and Neisseria, reflecting the common origin of their iga gene. However, the relatively limited prevalence of shared "neutralizing" epitopes of IgA1 proteases from the two genera indicates that they rarely induce immunity to each other. In contrast, extensive sharing of neutralizing epitopes was found between N. meningitidis and N. gonorrhoeae IgA1 proteases, making them potentially attractive vaccine components. Among metallo-type IgA1 proteases, several pneumococcal proteases were found to induce neutralizing antibodies to IgA1 proteases of oral streptococci whereas the opposite was not the case.

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Selected References

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