Catalyzes the reversible conversion of aspartate and 2-oxoglutarate to glutamate and oxaloacetate (PubMed:24302739, PubMed:25070637). Has very weak prephenate aminotransferase activity (PubMed:25070637). 2-oxoglutarate + L-aspartate = L-glutamate + oxaloacetate kcat is 54.2 sec(-1) with 2-oxoglutarate as substrate. kcat is 1.1 sec(-1) with prephenate as substrate. Homodimer. Belongs to the class-I pyridoxal-phosphate-dependent aminotransferase family.