Porin A (PorA) P1.4 and associated outer membrane vesicle antigens of Neisseria meningitidis group B (PorA P1.4 OMV)

Porin A (PorA) is a major class 1 outer membrane protein of Neisseria meningitidis, functioning as a selective cation-permeable channel essential for nutrient uptake and metabolic waste export (UniProt P0A105). The P1.4 variant refers to a specific serosubtype of the PorA protein, notably prevalent in epidemic strains such as the NZ98/254 strain responsible for the New Zealand meningococcal outbreak. Outer membrane vesicles (OMVs) are proteoliposomes naturally shed by the bacteria that contain PorA along with other critical antigens like PorB, Opa, and Opc, which play roles in adhesion and immune evasion (Holst et al., 2009, Vaccine). In therapeutic contexts, these OMVs are utilized as vaccine components to elicit a robust immune response. The primary mechanism of action involves the generation of bactericidal antibodies that target the variable regions of PorA, leading to complement-mediated lysis of the pathogen (Bambini et al., 2013, Vaccine). Because PorA is highly antigenically variable, OMV-based vaccines are often tailored to specific regional strains or combined with other recombinant proteins to broaden protection against serogroup B meningococci.

Other names

Class 1 outer membrane proteinPorin AMenB OMVP1.7-2,4MeNZB antigenNZ98/254 OMV

Induction of serum bactericidal antibodies (SBA) that facilitate complement-mediated killing of Neisseria meningitidis through recognition of PorA and other OMV-associated surface antigens (O'Hallahan et al., 2004, Lancet Infectious Diseases).