title: A flexible linkage between the dynein motor and its cargo.
abstract: We have used an antibody-Fab tag to mark the position of the cytoplasmic dynein amino-terminal tail domain, as it emerges from the main mass of the motor. Electron microscopy and single-particle image analysis reveal that the tag does not assume a rigidly fixed position, but instead can be found at various locations around the planar ring that comprises the motor's backbone. The work suggests that the tail is attached to the motor at a point near the ring center, and that the sequence immediately adjacent to this connection is flexible. Such flexibility argues against a simple-lever arm model for dynein force production.
authors.affiliation: Division of Molecular Medicine, Wadsworth Center, Albany, NY 12201, USA.
authors.forename: Xing
authors.initials: X
authors.lastname: Meng
authors.forename: Montserrat
authors.initials: M
authors.lastname: Samsó
authors.forename: Michael P
authors.initials: MP
authors.lastname: Koonce
mesh_terms: D000818:Animals; D004023:Dictyostelium / Q000201:enzymology; D004398:Dyneins / Q000737:chemistry* / Q000378:metabolism* / Q000648:ultrastructure; D008958:Models, Molecular; D020409:Molecular Motor Proteins / Q000737:chemistry* / Q000378:metabolism* / Q000648:ultrastructure
chemical_list: D020409:Molecular Motor Proteins; D004398:Dyneins