Involved in the translocation of tetra- and pentapeptides across the cellular membrane in an energy-dependent manner. May also transport cadmium complexes. Expressed in the major and the first-order veins and in the hydathodes of the leaves. In the roots, expressed in circular zones surrounding lateral root primordia and in some part of the root epidermis. Expressed also in the sepals and the cortical tissues of the stem, but not in the conducting bundles, the petals or the reproductive tissues. Not expressed at the embryo stage. Belongs to the oligopeptide OPT transporter (TC 2.A.67.1) family.