Catalyzes the reversible conversion of aspartate and 2-oxoglutarate to glutamate and oxaloacetate (PubMed:25070637). Can also transaminate prephenate in the presence of aspartate (PubMed:25070637). 2-oxoglutarate + L-aspartate = L-glutamate + oxaloacetate L-arogenate + oxaloacetate = L-aspartate + prephenate kcat is 17.2 sec(-1) with 2-oxoglutarate as substrate. kcat is 12.3 sec(-1) with prephenate as substrate. Homodimer. Belongs to the class-I pyridoxal-phosphate-dependent aminotransferase family.