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 has been reported to consist either of the Gal(alpha1-3) GlcNAc disaccharide, or the Gal(beta 1-4) Gal(alpha 1-3) 2,4-diacetamido-2,4,6-trideoxyhexose trisaccharide. Deletion mutants are unpiliated but nevertheless form biofilms showing that attachment and accumulation of cells did not depend on pilus expression. Belongs to the N-Me-Phe pilin family. In PubMed:413571 it is said that 50% of the peptides have N-methyl-Phe and 50% begin with Thr-9. N-terminal methylation produces preview during Edman degradation, which makes this appear to happen when the peptide is completely N-terminal methylated.