The C-terminus exists in a monomer-dimer equilibrium. The periplasmic C-terminus (residues 87-242) probably binds peptidoglycan. No visible phenotype when deleted in strains CCUG 37602 / M1080 / Serogroup B / Serotype 1 and 8765 / Serotype 15. Present in outer membrane vesicle blebs which are used as vaccines in human. Belongs to the outer membrane OOP (TC 1.B.6) superfamily.