2WHI CRYSTAL STRUCTURE OF MYCOBACTERIUM TUBERCULOSIS GLUTAMINE SYNTHETASE IN COMPLEX WITH A PURINE ANALOGUE INHIBITOR AND L-METHIONINE-S-SULFOXIMINE PHOSPHATE. LIGASE, NUCLEOTIDE-BINDING, TRANSITION STATE MIMIC, TAUT STATE, ATP-BINDING, PURINE ANALOGUE, GLNA1, MT2278, RV2220, CYTOPLASM, SYNTHETASE