Aspartate racemase that provides the D-aspartate required by the D-aspartate ligase to be added onto the lysine residue in the peptidoglycan precursor UDP-MurNAc-pentapeptide. L-aspartate = D-aspartate Cell wall biogenesis; peptidoglycan biosynthesis. Homodimer. Belongs to the aspartate/glutamate racemases family.