Proteins currently known to belong to the Ni²⁺-Co²⁺ Transporter (NiCoT) family (TC# 2.A.52] can be found in organisms ranging from Gram-negative and Gram-positive bacteria to archaea and some eukaryotes. Members of this family catalyze uptake of Ni²⁺ and/or Co²⁺ in a proton motive force-dependent process.