title: ATP hydrolysis cycle-dependent tail motions in cytoplasmic dynein.
abstract: The motor protein dynein is predicted to move the tail domain, a slender rod-like structure, relative to the catalytic head domain to carry out its power stroke. Here, we investigated ATP hydrolysis cycle-dependent conformational dynamics of dynein using fluorescence resonance energy transfer analysis of the dynein motor domain labeled with two fluorescent proteins. We show that dynein adopts at least two conformational states (states I and II), and the tail undergoes ATP-induced motions relative to the head domain during transitions between the two states. Our measurements also suggest that in the course of the ATP hydrolysis cycle of dynein, the tail motion from state I to state II takes place in the ATP-bound state, whereas the motion from state II to state I occurs in the ADP-bound state. The latter tail motion may correspond to the predicted power stroke of dynein.
authors.affiliation: Department of Life Sciences, Graduate School of Arts and Sciences, University of Tokyo, Komaba 3-8-1, Tokyo 153-8902, Japan.
authors.forename: Takahide
authors.initials: T
authors.lastname: Kon
authors.forename: Toshifumi
authors.initials: T
authors.lastname: Mogami
authors.forename: Reiko
authors.initials: R
authors.lastname: Ohkura
authors.forename: Masaya
authors.initials: M
authors.lastname: Nishiura
authors.forename: Kazuo
authors.initials: K
authors.lastname: Sutoh
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism*; D000595:Amino Acid Sequence; D000818:Animals; D001665:Binding Sites; D003593:Cytoplasm / Q000201:enzymology; D004023:Dictyostelium / Q000201:enzymology; D004398:Dyneins / Q000737:chemistry* / Q000378:metabolism*; D006868:Hydrolysis; D007700:Kinetics; D008954:Models, Biological; D009154:Mutation; D011487:Protein Conformation
chemical_list: D000255:Adenosine Triphosphate; D004398:Dyneins