Provides the (R)-glutamate required for cell wall biosynthesis. Converts L- or D-glutamate to D- or L-glutamate, respectively, but not other amino acids such as alanine, aspartate, and glutamine. L-glutamate = D-glutamate Thermostable. Cell wall biogenesis; peptidoglycan biosynthesis. Homodimer. Belongs to the aspartate/glutamate racemases family.