protein secretion protein secretion by the type V secretion system protein secretion by the type V protein secretion system autotransporter system http://purl.obolibrary.org/obo/go.owl protein secretion by the autotransporter system type V protein secretion system The process in which proteins mediate their own secretion across the outer membrane through a beta-barrel pore structure formed by the C-terminal domain of the protein precursor. Following passage across the outer membrane, the mature protein is released from the pore by an autocatalytic activity. Proteins secreted by the Type V system are first translocated across the plasma membrane by the Sec pathway. [database_cross_reference: GOC:pamgo_curators] protein transport across the cell outer membrane