purified recombinant C-terminally His-tagged enzyme, for crystallization purposes, the N-terminal transmembrane domain upstream of Pro32 is replaced with MAKKTSSKGKL- in the construct used for co-crystallization with fluconazole and (R)-4'-chloro-N-(1-(2,4-dichlorophenyl)-2-(1H-imid-azol-1-yl)ethyl)biphenyl-4-carboxamide, and with MAKKT-(5'-ATGGTCAAGAAAACG-3') in the complex with posaconazole, hanging drop vapour diffusion method, 25°C, from 0.260 mM cytochrome P450 solution in 20 mM potassium phosphate buffer, pH 7.2, containing 200 mM NaCl, 0.1 mM EDTA,10% glycerol, and 0.048mMn-tridecyl-beta-D-maltoside preincubated with 1.2fold molar excess of posaconazole, or (R)-4'-chloro-N-(1-(2,4-dichlorophenyl)-2-(1H-imid-azol-1-yl)ethyl)biphenyl-4-carboxamide, and 2-fold molar excess of fluconazole against an equal volume of well solution containing 0.2 M potassium formate, pH 7.2, or 0.2 M sodium formate, pH 7.4, in the case of (R)-4'-chloro-N-(1-(2,4-dichlorophenyl)-2-(1H-imid-azol-1-yl)ethyl)biphenyl-4-carboxamide, and 15% w/v PEG 3550, X-ray diffraction structure determination and analysis, modelling |
Trypanosoma cruzi |