2014 年 54 巻 2 号 p. 085-090
Membrane transporters transport their substrates across the membrane, thereby contributing to the maintenance of the cellular environments. One of the largest superfamily of the membrane transporters is Major Facilitator Superfamily (MFS), and many of MFS transporters are involved in the cellular uptake of various compounds utilizing the proton motive force across the membrane. Although several crystal structures of MFS transporters have been reported so far, their active transport mechanism has still remained elusive. Proton-dependent oligopeptide transporter, POT, is a member of MFS, and is involved in the uptake of oligopeptides as well as peptide-like drugs. In this article, we explain the active transporter mechanism by POT based on our recent results of the structural and computational analyses.