Catalyzes the reversible conversion of aspartate and 2-oxoglutarate to glutamate and oxaloacetate (PubMed:24302739). Can also transaminate prephenate in the presence of glutamate, with lower efficiency (PubMed:24302739). 2-oxoglutarate + L-aspartate = L-glutamate + oxaloacetate 2-oxoglutarate + L-arogenate = L-glutamate + prephenate kcat is 33 sec(-1) with oxaloacetate as substrate. kcat is 0.8 sec(-1) with prephenate as substrate. Homodimer. Belongs to the class-I pyridoxal-phosphate-dependent aminotransferase family.