Model of DPI binding to ALDH2. A: Stereoscopic representation of the active site of ALDH2 (green) in complex with DPI (blue). The enzyme is shown as cartoon and active site residues and DPI are shown as sticks. B: Superposition of the modelled ALDH2-complex with DPI and the experimentally determined structure of GTN-bound ALDH2 (pdb-code 4fr8). The enzyme is shown as cartoon (green), Cys-302, DPI (blue), and GTN (red) are shown as sticks.