title: An x-ray crystallographic study of Escherichia coli glutamine synthetase.
mesh_terms: D004926:Escherichia coli / Q000201:enzymology*; D005971:Glutamates / Q000378:metabolism; D005973:Glutamine / Q000096:biosynthesis; D008025:Ligases / Q000032:analysis*; D009905:Optical Rotatory Dispersion; D014961:X-Ray Diffraction
chemical_list: D005971:Glutamates; D005973:Glutamine; D008025:Ligases