Porin A protein subtype P1.4 (PorA P1.4)

Porin A subtype P1.4, often referred to as PorA P1.4, is a subtype of the major outer membrane porin (PorA) found in *Neisseria meningitidis* serogroup B and is recognized as a key antigen involved in meningococcal disease outbreaks in Western countries[1][5]. PorA is a trimeric β-barrel protein that forms pores in the bacterial outer membrane, allowing passive diffusion of small hydrophilic compounds[2][3][5]. The P1.4 designation refers to a specific variant defined by the sequence of surface-exposed loop regions (especially loop 1 and 4), which are highly immunogenic and serve as the primary target for subtype-specific bactericidal antibodies[1][5]. Vaccines based on PorA P1.4-derived peptides or outer membrane vesicles primarily induce protective antibody responses through recognition of these loops, although antigenic diversity among PorA subtypes remains a challenge for universal vaccine efficacy[1][5].

Other names

PorAClass 1 Porin protein P1.4Neisserial PorA P1.4Outer membrane protein PorA P1.4

For vaccines and antibodies: recognition of the surface-exposed loop regions by the adaptive immune system, leading to antibody-mediated complement activation and bacterial lysis