MFS-type transporter; part of the gene cluster that mediates the biosynthesis of UCS1025A, a member of the pyrrolizidinone family that acts as a strong telomerase inhibitor and displays potent antibacterial and antitumor properties (PubMed:29373009). These compounds share a hemiaminal-containing pyrrolizidinone core fused with a gamma-lactone, giving a furopyrrolizidine that is connected to a decalin fragment (PubMed:29373009). Belongs to the major facilitator superfamily. Proton-dependent oligopeptide transporter (POT/PTR) (TC 2.A.17) family.