Suggested to be part of an ABC transporter complex YydIJ involved in export of the modified peptide YydF. The complex is composed of 2 ATP-binding proteins (YydI), two transmembrane proteins (YydJ). Transcriptionally repressed by rok (PubMed:15743949), this was not found to be the case in another study (PubMed:17921301). Up-regulates expression of the LiaRS two-component regulatory system; this effect is more pronounced on modified competence medium than on rich or sporulation medium.