Enables branched-chain amino acid transmembrane transporter activity. Involved in branched-chain amino acid catabolic process; branched-chain amino acid transport; and regulation of cold-induced thermogenesis. Located in mitochondrion. Is expressed in several structures, including central nervous system; metanephros; and retina. Orthologous to human SLC25A44 (solute carrier family 25 member 44). [provided by Alliance of Genome Resources, Apr 2022]