The dynein heavy chain: structure, mechanics and evolution.

The translocation of dynein along microtubules is the basis for a variety of essential cellular movements. Despite a general domain organization that is found in all the cytoskeletal motors, there are structural features of dynein that set it apart from the other motors. These include a track-binding site that is located at the tip of a long projection, and six nucleotide-binding modules that together form the globular head of dynein. These unique features suggest that dynein produces movement by a mechanism that is different from that used by the other motors.