Serves as a slightly cation selective porin. Major antigen on the gonococcal cell surface and it may have pathogenic properties in addition to its porin activity. MKKSLIALTLAALPVAATADVTLYGAIKAGVQTYRSVEHTDGKVSKVETGSEIADFGSKIGFKGQEDLGNGLKAVWQLEQGASVAGTNTGWGNKQSFVGLKGGFGTIRAGSLNSPLKNTDANVNAWESGKFTGNVLEISGMAKREHRYLSVRYDSPEFAGFSGSVQYAPKDNSGSNGESYHVGLNYQNSGFFAQYAGLFQRYGEGTKKIEYEHQVYSIPSLFVEKLQVHRLVGGYDNNALYVSVAAQQQDAKLYGARRANSHNSQTEVAATAAYRFGNVTPRVSYAHGFKGTVDSADHDNTYDQVVVGAEYDFSKRTSALVSAGWLQEGKGADKIVSTASAVVLRHKF Porin porB 348 OMPB1_NEIGO Major outer membrane protein P.IB