Bifunctional enzyme that has both L-aspartate decarboxylase and transaminase activity. H(+) + L-aspartate = CO2 + L-alanine 2-oxoglutarate + L-aspartate = L-glutamate + oxaloacetate Optimum pH is 5. Optimum temperature is 45 degrees Celsius. Homododecamer. Is highly specific for L-aspartic acid, and so can be used to produce L-alanine and D-aspartic acid from DL-aspartic acid. Belongs to the class-I pyridoxal-phosphate-dependent aminotransferase family.