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. MKKSLIALTLAALPVAAMADVTLYGTIKAGVETSRSVAHHGAQADRVKTATEIADLGSKIGFKGQEDLGNGLKAIWQLEQKAYVSGTDTGWGNRQSFIGLKGGFGKVRVGRLNSVLKDTGGFNPWEGKSYYLGLSNIAQPEERHVSVRYDSPEFAGFRAVQYVPNDNSGKNHSESYHAGFNYKNSGFFVQYAGFYKRHSYTTEKHQVHRLVGGYDHDALYASVAVQQQDAKLTWRNDNSHNSQTEVAATAAYRFGNVTPRVSYAHGFKGSVYDADNDNTYDQVVVGAEYDFSKRTSALVSAGWLQRGKGTEKFVATVGGVGLRHKF Major outer membrane protein P.IA 326 Class 1 protein OMPA_NEIGO porA