Enables protein homodimerization activity. Predicted to be involved in several processes, including cellular calcium ion homeostasis; regulation of insulin secretion; and regulation of store-operated calcium entry. Predicted to act upstream of or within calcium ion transmembrane transport and sodium ion transmembrane transport. Located in mitochondrial crista and sarcolemma. Orthologous to human SLC8B1 (solute carrier family 8 member B1). [provided by Alliance of Genome Resources, Apr 2022]