5.2.1.1 - 2451 5.2.1.1 im complex with maleate 715258 5.2.1.1 purified recombinant wild-type alone, and mutant enzyme C200A in complex with substrate maleate, hanging-drop vapour-diffusion method, mixing of 15-20 mg/ml protein in 25 mM Tris-HCl, pH 8.0, 150 mM NaCl, and 2 mM DTT, with a reservoir solution containing 25% w/v PEG3,350 and 0.1 M Tris, pH 8.5, for the substrate-enzyme mutant complex, and 1.4 M (NH4)2SO4, 120 mM NaCl, and 0.1 M HEPES, pH 7.5, for the free wild-type enzyme, 14°C, X-ray diffraction structure determination and analysis at 2.95 A and 2.10 A resolution, respectively 728334