1.14.99.50 analysis of crystal structure of EgtB, PDB ID 4X8D, in complex with iron(II) and N-alpha-trimethylhistidine 1.14.99.50 analysis of the X-ray crystal structure of EgtB from Mycobacterium thermoresistibile, solved in three different forms, namely, the apo form, in complex with iron and the N-alpha-trimethyl histidine substrate, and in complex with manganese and the two natural substrates gamma-glutamyl cysteine and alpha-trimethyl histidine at 1.98 A resolution, with the active site for the third one. X-ray structure of the active site of EgtB complex with gamma-glutamyl cysteine and N-alpha-trimethyl histidine, coordinates taken from PDB ID 4X8D. Mn is replaced by Fe in the active site 1.14.99.50 purified recombinant enzyme, as iron-bound holoenzyme, in complex with substrate gamma-glutamyl cysteine, N-alpha-dimethyl histidine and Mn2+ or with substrate N-alpha-trimethyl histidine and Fe2+, X-ray diffraction structure determination and analysis 1.14.99.50 to 2.5 A resolution. Enzyme is a tetramer. The active site is located at the interface between the N- and C-terminal domains for each monomer where a mononuclear nonheme iron is coordinated by His62, His153, His157 and three water molecules in an octahedral arrangement