The role of neisserial Opa proteins in interactions with host cells.

Pathogenic Neisseria spp. possess a repertoire of phase-variable Opa proteins that mediate various pathogen--host cell interactions, including bacterial engulfment by epithelial cells and opsonin-independent phagocytosis by professional phagocytes. Recent studies have identified cellular targets recognized by defined Opa proteins and have begun to reveal host signalling events involved in mediating these Opa-dependent cellular processes.