We chose (a) near-rigor structure, 1Q5G, and (b) pre-power stroke structure, 1VOM for structure 1 and 2, respectively. 1VOM contains the ADP·Pi analog, ADP·VO4 (yellow). Also shown are the N-terminal (green), 50-kDa subdomain (red) and the converter (cyan) included in C-terminal subdomain (blue) that is connected to the lever arm.