Amino-acid racemase able to utilize a broad range of substrates. Preferentially catalyzes the epimerization of LL-diaminopimelate, as well as the racemization of D-lysine, L-arginine, L-ornithine, L-lysine and D-arginine. Has lower activity against D-ornithine, L-histidine, L-alanine, L-tyrosine, L-phenylalanine, L-serine, L-glutamine, L-methionine, L-asparagine and L-homoserine. Has weak activity against L-norleucine, L-aminobutyric acid and L-norvaline. Has no activity toward nine L-amino acids (Thr, Glu, Asp, Val, Leu, Ile, Trp, Cit and Aad) (PubMed:28894939). D-amino acids might be used as components of peptidoglycan and/or be involved in peptidoglycan metabolism and remodeling (PubMed:8491712, PubMed:28894939). an L-alpha-amino acid = a D-alpha-amino acid (2S,6S)-2,6-diaminoheptanedioate = meso-2,6-diaminoheptanedioate L-lysine = D-lysine L-arginine = D-arginine L-ornithine = D-ornithine L-histidine = D-histidine L-alanine = D-alanine L-tyrosine = D-tyrosine L-phenylalanine = D-phenylalanine L-serine = D-serine L-glutamine = D-glutamine L-methionine = D-methionine L-asparagine = D-asparagine L-homoserine = D-homoserine kcat is 0.08 min(-1) with L-lysine as substrate. kcat is 0.224 min(-1) with D-lysine as substrate. Optimum pH is 8.5 with L-lysine as substrate. Optimum temperature is 37 degrees Celsius. Homodimer. Weakly expressed during vegetative growth and significantly induced at the onset of sporulation. Belongs to the aspartate/glutamate racemases family.