Major component of the type IV pilus (T4P) that plays a role in cellular adherence, microcolony formation as well as twitching motility. The pili are polar flexible filaments of about 5.4 nanometers diameter and 2.5 micrometers average length; they consist of only a single polypeptide chain arranged in a helical configuration of five subunits per turn in the assembled pilus. O-linked glycan consists of GlcNAc-Gal disaccharide. Belongs to the N-Me-Phe pilin family.