Part of the elfADCG fimbrial operon, which could be required for adherence to host epithelial cells. Could be involved in the export and assembly of the ElfA fimbrial subunits across the outer membrane. Induced in the presence of epithelial cells. Belongs to the fimbrial export usher family. This may be a natural frameshift. This may be a natural frameshift. This may be a natural frameshift. This may be a natural frameshift.