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Subunit organization in the Dam1 kinetochore complex and its ring around microtubules

Journal Article · · Molecular Biology of the Cell
 [1];  [2];  [3];  [2];  [4];  [5]
  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. Univ. of California, Berkeley, CA (United States). Biophysics Graduate Group
  3. Univ. of California, Berkeley, CA (United States). Howard Hughes Medical Inst.
  4. Univ. of California, Berkeley, CA (United States). Molecular and Cell Biology Dept.
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Life Science Division; Univ. of California, Berkeley, CA (United States). Molecular and Cell Biology Dept.; Univ. of California, Berkeley, CA (United States). Howard Hughes Medical Inst.
All eukaryotic cells must segregate their chromosomes equally between two daughter cells at each division. This process needs to be robust, as errors in the form of loss or gain of genetic material have catastrophic effects on viability. Chromosomes are captured, aligned, and segregated to daughter cells via interaction with spindle microtubules mediated by the kinetochore. In Saccharomyces cerevisiae one microtubule attaches to each kinetochore, requiring extreme processivity from this single connection. The yeast Dam1 complex, an essential component of the outer kinetochore, forms rings around microtubules and in vitro recapitulates much of the functionality of a kinetochore–microtubule attachment. To understand the mechanism of the Dam1 complex at the kinetochore, we must know how it binds to microtubules, how it assembles into rings, and how assembly is regulated. We used electron microscopy to map several subunits within the structure of the Dam1 complex and identify the organization of Dam1 complexes within the ring. Of importance, new data strongly support a more passive role for the microtubule in Dam1 ring formation. Integrating this information with previously published data, we generated a structural model for the Dam1 complex assembly that advances our understanding of its function and will direct future experiments.
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:
1625227
Journal Information:
Molecular Biology of the Cell, Journal Name: Molecular Biology of the Cell Journal Issue: 22 Vol. 22; ISSN 1059-1524
Publisher:
American Society for Cell BiologyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (12)

The kinetochore encodes a mechanical switch to disrupt spindle assembly checkpoint signalling journal June 2015
The molecular architecture of the Dam1 kinetochore complex is defined by cross-linking based structural modelling journal November 2015
Phosphoregulation promotes release of kinetochores from dynamic microtubules via multiple mechanisms journal April 2013
Structural insights into WHAMM-mediated cytoskeletal coordination during membrane remodeling journal October 2012
Molecular requirements for the formation of a kinetochore–microtubule interface by Dam1 and Ndc80 complexes journal December 2012
Structural plasticity of the living kinetochore journal September 2017
A Molecular View of Kinetochore Assembly and Function journal January 2017
Synthetic protein interactions reveal a functional map of the cell journal April 2016
Kinetochore–microtubule error correction is driven by differentially regulated interaction modes journal March 2015
A multi-scale model of the yeast chromosome-segregation system posted_content April 2018
Structure of the DASH/Dam1 complex shows its role at the yeast kinetochore-microtubule interface journal May 2018
The Ndc80 complex bridges two Dam1 complex rings journal February 2017

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