MFS-type transporter; part of the gene cluster that mediates the biosynthesis of PR-toxin, a bicyclic sesquiterpene belonging to the eremophilane class and acting as a mycotoxin. Expression and the subsequent production of PR-toxin take place under static culture conditions (oxygen limited), whereas no expression of the PR-toxin genes occurs under the strongly aerated conditions required for optimal penicillin production (PubMed:24239699). There is a negative control of the transcription of the PR-toxin genes by the penicillin biosynthesis gene product(s), or by a regulatory peptide encoded by a small ORF inside the penicillin gene cluster (PubMed:24239699). Belongs to the major facilitator superfamily.