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for the purified ligand-free recombinant wild-type enzyme: sitting drop vapor diffusion method, mixing of 0.001 ml of 12.0 mg/ml protein solution with an equal volume of mother liquor composed of 0.1 M potassium phosphate, pH 6.2, and 20% MPD, 2 days, 20°C, for the homoserine-bound K57A mutant enzyme: sitting drop vapor diffusion method, mixing of 0.002 ml of 10 mg/ml protein solution containing 1 mM homoserine with 0.002 ml of mother liquor containing 16% polyethylene glycol monomethyl ether 2000 and 0.1 M citrate buffer, pH 6.5, 7 days, 20°C, X-ray diffraction structure determination and analysis at 2.3 A resolution, molecular replacement and modelling
10 mg/ml purified recombinant enzyme, in TAPS, pH 8.5, in complex with inhibitor 4,4'-thiobis[2-(1-methylethyl)-phenol] in a molar ratio of 1:1, precipitant solution contains either 0.1 CHES, pH 9.5, 35% PEG 600 or 0.1 M CHES, pH 8.5, 40% PEG 400, and 0.2 M NaCl, 0.005 ml protein complex solution are equilibrated against 0.7 ml of precipitant solution using sitting drop technique, 3 months, X-ray diffraction structure determination and analysis at 3.0 A resolution, modeling
purified enzyme, crystallization at different pH values in the range of pH 6.0-8.5, hanging drop and sitting drop methods of vapour diffusion, 8 mg/ml protein solution is mixed with reservoir solution, different conditions involving addition of 0.2 M magnesium acetate and PEG 3350 or 8000, and 3.5% glycerol, overview. X-ray diffraction structure determination and analysis at 2.1-2.2 A resolution
purified enzyme, crystallization at different pH values in the range of pH 6.0-8.5, X-ray diffraction structure determination and analysis at 2.1-2.2 A resolution
purified recombinant enzyme in oxidized and in reduced form, hanging drop vapor diffusion method, for the oxidized form: mixing of 0.0015 ml of 5.9 mg/ml protein solution with 0.0015 ml of reservoir solution, pH 4.1, containing 9.5% w/v PEG 3350, 19% w/v PEG 400, 0.19 M magnesium chloride, and 2.5% DMSO, for the reduced form: soaking of the oxidized enzyme crystals in a solution consisting of 0.003 ml of reservoir solution and 0.001 ml of 200 mM DTT for 60 min prior to the first diffraction data collection, 12°C, X-ray diffraction structure determmination and analysis at 1.60-1.83 A resolution, molecular replacement and modelling