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FEMS Immunol Med Microbiol. 2000 Nov;29(3):169-76.

Genetic and immunologic characterization of a novel serotype 4, 15 strain of Neisseria meningitidis.

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1
Division of Bacterial Products, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda, MD 20892, USA. bash@cber.fda.gov

Abstract

The porin proteins of Neisseria meningitidis are important components of outer membrane protein (OMP) vaccines. The class 3 porin gene, porB, of a novel serogroup B, serotype 4, 15 isolate from Chile (Ch501) was found to be VR1-4, VR2-15, VR3-15 and VR4-15 by porB variable region (VR) typing. Rabbit immunization studies using outer membrane vesicles revealed immunodominance of individual PorB (class 3) VR epitopes. The predominant anti-Ch501 PorB response was directed to the VR1 epitope. Anti-PorB VR1 mediated killing was suggested by the bactericidal activity of Ch501 anti-sera against a type 4 strain not expressing PorA or class 5 OMPs. Studies that examine the molecular epidemiology of individual porB VRs, and the immune responses to PorB epitopes, may contribute to the development of broadly protective group B meningococcal vaccines.

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