1.4.1.18 | purified recombinant enzyme complexed with NAD+ and a sulfate ion, sitting drop vapor diffusion method, 0.001 ml of 10 mg/ml protein in 100 mM citrate, pH 5.8, 2.1 M ammonium sulfate, and 1 mM NAD+, is mixed with 0.001 ml of reservoir solution, 20°C, X-ray diffraction structure determination and analysis at 2.44 A resolution |