Component of the type II secretion system required for the energy-dependent secretion of extracellular factors such as proteases and toxins from the periplasm (PubMed:27260845). Part of the pseudopilus tip complex that is critical for the recognition and binding of secretion substrates (By similarity). Type II secretion is composed of four main components: the outer membrane complex, the inner membrane complex, the cytoplasmic secretion ATPase and the periplasm-spanning pseudopilus. Interacts with core component PulG (By similarity). Interacts with PulM (PubMed:27260845). Cleaved by prepilin peptidase. Methylated by prepilin peptidase at the amino group of the N-terminal phenylalanine once the leader sequence is cleaved by prepilin peptidase.