The Dam1 ring binds to the E-hook of tubulin and diffuses along the microtubule
Journal Article
·
· Molecular Biology of the Cell
- Univ. of California, Berkeley, CA (United States). Biophysics Graduate Group; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Life Science Division; DOE/OSTI
- 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). Dept. of Molecular and Cell Biology; Univ. of California, Berkeley, CA (United States). Howard Hughes Medical Inst.
- National Heart Lung and Blood Inst. (NHLBI), Bethesda, MD (United States). Computational Biology Lab.
- 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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