5.3.1.12 | enzyme Bh0493 in complex with substrate D-glucuronate, D-fructuronate, or two inhibitory mimics of the cis-enediol intermediate, hanging drop method at room temperature, B16 mg/ml h0493 in 10 mM HEPES, pH 7.5, 150 mM NaCl, 10 mM methionine, 10% glycerol, 1.0 mM DTT, 0.2 mM ZnCl2, and the corresponding substrate or inhibitor at 40 mM, precipitation solutions are 20% PEG 3350 and 0.2 M sodium citrate, pH 6.0, or 25% PEG 3350, 0.1 M Tris, pH 8.5, and 0.2 M NaCl, X-ray diffraction structure determination and analysis at 1.9-2.2 A resolution |