1.1.1.290 hanging-drop vapour diffusion at 24°C K using 0.7 M ammonium dihydrogen phosphate, 0.4 M ammonium tartrate, 0.1 M sodium citrate pH 5.6 and 10 mM cupric chloride 1.1.1.290 purified recombinant C-terminally His8-tagged and selenomethionine-labeled enzyme, subunit A is bound with NAD+ and a phosphate ion, while subunit B, with a more open active site cleft, is bound with NAD+ and L(+)-tartrate, cryoprotection by 30% glycerol, X-ray diffraction structure determination and analysis at 2.3 A resolution, asymmetric subunit conformation and strucure comparison, overview