Plays a key role in amino acid metabolism. 2-oxoglutarate + L-aspartate = L-glutamate + oxaloacetate Optimum pH is 8-9. Homodimer. Targeted to peroxisomes in cells grown in oleate. In eukaryotes there are cytoplasmic, mitochondrial and chloroplastic isozymes. Present with 7700 molecules/cell in log phase SD medium. Belongs to the class-I pyridoxal-phosphate-dependent aminotransferase family. Extended N-terminus.