Crystallization and preliminary crystallographic analysis of trypanothione reductase fromTrypanosoma cruzi, the causative agent of Chagas' disease

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Abstract
Trypanothione reductase from Trypanosoma cruzi is the most promising target molecule for the rational design of a specific drug against Chagas' disease. The recombinant protein was purified in a single Chromatographie step and crystallized. Two crystal forms suitable for X-ray diffraction analysis were obtained. Tetragonal crystals ( a = b = 87.4 Å, c = 152.3 Å) were grown from 30% polyethylene glycol (average M r = 8,000) in the presence of 0.2% β- n -octylglucoside (space group either P4 2 with one dimer or P4 2 22 with one monomer in the asymmetric unit). Monoclinic crystals (space group P2, a = 136.3 Å, b = 91.1 Å, c = 126.0 Å, β = 94°) were grown from 1.2 M sodium citrate in the presence of 2% octanoyl- N -methyl-glucamide. They contain two dimers of the enzyme in the asymmetric unit; both crystal forms diffract to 3 Å resolution.