Efflux pump; part of the gene cluster that mediates the biosynthesis of patulin, an acetate-derived tetraketide mycotoxin produced by several fungal species that shows antimicrobial properties against several bacteria (PubMed:19383676). May be involved in the secretion of E-ascladiol to be converted to patulin by the secreted patulin synthase patE (By similarity). Patulin was originally used as an antibiotic and specifically trialed to be used against the common cold, but it is no longer used for that purpose since it has been shown to induce immunological, neurological and gastrointestinal effects (PubMed:15082620). Genotoxic effects of patulin with dose-dependent increase in DNA strand breaks in brain, liver and kidneys have been detected in mice (PubMed:22222931). However, more recently, it has been proposed that patulin might also have anti-tumor properties (PubMed:26619846). Belongs to the major facilitator superfamily. TCR/Tet family.