1.2.1.5 ALDHC in complex with NADPH bound in the cofactor binding pocket and an ordered fragment of a polyethylene glycol molecule bound in the substrate tunnel, to 1.6 A resolution. Belongs to space group P1. The ALDHC monomer comprises three distinct domains, an N-terminal cofactor (NAD/P+)-binding domain, a catalytic domain, and an oligomerization domain 688414 1.2.1.5 hanging drop vapor diffusion method, using 0.15 M DL-malic acid pH 7.0, 18% (w/v) PEG 3350 723877 1.2.1.5 purified recombinant BcALDH alone and in complex with NAD+ and NADP+ cofactors, sitting drop vapour diffusion method, mixing of 10 mg/ml protein in 25 mM Tris, pH 7.5, 15 mM NaCl, and 3 mM 2-mercaptoethanol, with crystallization solution containing 0.15 M DL-malic acid, pH 7.0, and 18% PEG 3350 w/v, at 14°C, 1 week, X-ray diffraction structure determination and analysis at 2.0-2.6 A resolution, molecular replacement using human ALDH2 structure (PDB ID 4FR8) as the search model, modeling. The apo-BcALDH structure contains four protomers in the asymmetric unit 763136 1.2.1.5 the apoenzyme is crystallized by using 100 mM ACES, pH 6.4, 100-200 mM guanidine-HCl, 1-10 mM MgCl2 and 16–17% (w/v) PEG 6000, the mutant T244A in complex with NAD is crystallized by using 100 mM ACES, pH 6.4, 100 mM guanidine–HCl, 10 mM MgCl2 and 18% (w/v) PEG 6000 724720