Exhibits racemase activity for both L-glutamate and L-aspartate, but has threefold higher activity for L-glutamate than L-aspartate. Cannot use D-glutamate or D-aspartate as substrate. L-glutamate = D-glutamate L-aspartate = D-aspartate Homodimer. Belongs to the aspartate/glutamate racemases family.