Enables branched-chain-amino-acid transaminase activity and identical protein binding activity. Predicted to be involved in leucine biosynthetic process and valine biosynthetic process. Predicted to act upstream of or within branched-chain amino acid catabolic process. Located in cytoplasm. Orthologous to human BCAT1 (branched chain amino acid transaminase 1). [provided by Alliance of Genome Resources, Apr 2022]