CRYSTAL STRUCTURE OF ENOLPYRUVYL-UDP-GLCNAC SYNTHASE (MURA) :UDP-N-ACETYLMURAMIC ACID:PHOSPHITE FROM ESCHERICHIA COLI 3ISS TRANSFERASE, PROTEIN-LIGAND, CELL CYCLE, CELL DIVISION, CELL SHAPE, CELL WALL BIOGENESIS/DEGRADATION, CYTOPLASM, PEPTIDOGLYCAN SYNTHESIS