Involved in the transport of copper, in cooperation with SWEET11 and COPT1. Contributes to the removal of copper (Cu) from xylem, and thus to the sensitivity toward bacterial pathogens such as X.oryzae pv. oryzae (Xoo). Self-interacts. Interacts with SWEET11 and COPT1. Reduced copper transport ability, increase in copper content of the xylem, and enhanced resistance against X.oryzae pv. oryzae (Xoo) PXO99. Belongs to the copper transporter (Ctr) (TC 1.A.56) family. SLC31A subfamily.