Part of the ecpRABCDE operon, which encodes the E.coli common pilus (ECP). ECP is found in both commensal and pathogenic strains and plays a dual role in early-stage biofilm development and host cell recognition (By similarity). Negatively regulated by H-NS. Positively regulated by IHF and EcpR (By similarity). Belongs to the EcpB/EcpE family. Extended N-terminus.