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The Dam1 ring binds to the E-hook of tubulin and diffuses along the microtubule

Journal Article · · Molecular Biology of the Cell
 [1];  [2];  [3];  [4];  [5];  [3];  [3];  [6]
  1. Univ. of California, Berkeley, CA (United States). Biophysics Graduate Group; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Life Science Division; DOE/OSTI
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Life Science Division
  3. Univ. of California, Berkeley, CA (United States). Dept. of Molecular and Cell Biology
  4. Univ. of California, Berkeley, CA (United States). Dept. of Molecular and Cell Biology; Univ. of California, Berkeley, CA (United States). Howard Hughes Medical Inst.
  5. National Heart Lung and Blood Inst. (NHLBI), Bethesda, MD (United States). Computational Biology Lab.
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Life Science Division; Univ. of California, Berkeley, CA (United States). Dept. of Molecular and Cell Biology; Univ. of California, Berkeley, CA (United States). Howard Hughes Medical Inst.
There has been much effort in recent years aimed at understanding the molecular mechanism by which the Dam1 kinetochore complex is able to couple microtubule depolymerization to poleward movement. Both a biased diffusion and a forced walk model have been proposed, and several key functional aspects of Dam1-microtubule binding are disputed. Here, we investigate the elements involved in tubulin-Dam1 complex interactions and directly visualize Dam1 rings on microtubules in order to infer their dynamic behavior on the microtubule lattice and its likely relevance at the kinetochore. We find that the Dam1 complex has a preference for native tubulin over tubulin that is lacking its acidic C-terminal tail. Statistical mechanical analysis of images of Dam1 rings on microtubules, applied to both the distance between rings and the tilt angle of the rings with respect to the microtubule axis, supports a diffusive ring model. We also present a cryo-EM reconstruction of the Dam1 ring, likely the relevant assembly form of the complex for energy coupling during microtubule depolymerization in budding yeast. The present studies constitute a significant step forward by linking structural and biochemical observations toward a comprehensive understanding of the Dam1 complex.
Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
National Institutes of Health (NIH); USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1625224
Journal Information:
Molecular Biology of the Cell, Journal Name: Molecular Biology of the Cell Journal Issue: 4 Vol. 22; ISSN 1059-1524
Publisher:
American Society for Cell BiologyCopyright Statement
Country of Publication:
United States
Language:
English

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  • G., De Luca, Jennifer; Sebastiano, Pasqualato,; Emanuela, Screpanti,
  • The University of North Carolina at Chapel Hill University Libraries https://doi.org/10.17615/gffh-5h68
text January 2008

Cited By (15)

The molecular architecture of the Dam1 kinetochore complex is defined by cross-linking based structural modelling journal November 2015
Structural insights into WHAMM-mediated cytoskeletal coordination during membrane remodeling journal October 2012
Cdt1 stabilizes kinetochore–microtubule attachments via an Aurora B kinase–dependent mechanism journal August 2018
Electron cryotomography analysis of Dam1C/DASH at the kinetochore–spindle interface in situ journal November 2018
The family-specific K-loop influences the microtubule on-rate but not the superprocessivity of kinesin-3 motors journal July 2014
Cdt1 modulates kinetochore-microtubule attachment stabilization via an Aurora B kinase-dependent mechanism journal June 2018
Spastin's Microtubule-Binding Properties and Comparison to Katanin journal December 2012
A Molecular View of Kinetochore Assembly and Function journal January 2017
Processivity vs. Beating: Comparing Cytoplasmic and Axonemal Dynein Microtubule Binding Domain Association with Microtubule journal March 2019
E-hooks provide guidance and a soft landing for the microtubule binding domain of dynein journal September 2018
Tau Protein Diffuses along the Microtubule Lattice journal November 2012
An array of nuclear microtubules reorganizes the budding yeast nucleus during quiescence journal November 2013
Subunit organization in the Dam1 kinetochore complex and its ring around microtubules journal November 2011
Structure of the DASH/Dam1 complex shows its role at the yeast kinetochore-microtubule interface journal May 2018
The Composition, Functions, and Regulation of the Budding Yeast Kinetochore journal August 2013

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