Peptide transporter; part of the gene cluster that mediates the biosynthesis of imizoquins A to D, tripeptide-derived alkaloids that serve a protective role against oxidative stress that are essential for normal germination (PubMed:29182847). Expression is down-regulated by ralstonins, lipopeptides produced by the plant pathogenic bacteria Ralstonia solanacearum (PubMed:29182847). Expression is positively regulated by the imizoquins cluster-specific transcription regulator imqK (PubMed:29182847). Belongs to the major facilitator superfamily. Proton-dependent oligopeptide transporter (POT/PTR) (TC 2.A.17) family.