Enables copper ion binding activity and enzyme activator activity. Predicted to be involved in mitochondrial cytochrome c oxidase assembly; positive regulation of cell population proliferation; and positive regulation of cytochrome-c oxidase activity. Located in mitochondrion. Is expressed in brain; heart; metanephros; and skeletal muscle. Orthologous to human COX17 (cytochrome c oxidase copper chaperone COX17). [provided by Alliance of Genome Resources, Apr 2022]