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FAM29A promotes microtubule amplification via recruitment of the NEDD1-gamma-tubulin complex to the mitotic spindle

Academic Article
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Overview

authors

  • Zhu, H.
  • Coppinger, J. A.
  • Jang, C. Y.
  • Yates III, John
  • Fang, G. W.

publication date

  • December 2008

journal

  • Journal of Cell Biology  Journal

abstract

  • Microtubules (MTs) are nucleated from centrosomes and chromatin. In addition, MTs can be generated from preexiting MTs in a gamma-tubulin-dependent manner in yeast, plant, and Drosophila cells, although the underlying mechanism remains unknown. Here we show the spindle-associated protein FAM29A promotes MT-dependent MT amplification and is required for efficient chromosome congression and segregation in mammalian cells. Depletion of FAM29A reduces spindle MT density. FAM29A is not involved in the nucleation of MTs from centrosomes and chromatin, but is required for a subsequent increase in MT mass in cells released from nocodazole. FAM29A interacts with the NEDD1-gamma-tubulin complex and recruits this complex to the spindle, which, in turn, promotes MT polymerization. FAM29A preferentially associates with kinetochore MTs and knockdown of FAM29A reduces the number of MTs in a kinetochore fiber, activates the spindle checkpoint, and delays the mitotic progression. Our study provides a biochemical mechanism for MT-dependent MT amplification and for the maturation of kinetochore fibers in mammalian cells.

subject areas

  • Centrosome
  • Chromatin
  • HeLa Cells
  • Humans
  • Kinetochores
  • Microtubule-Associated Proteins
  • Microtubules
  • Mitosis
  • Spindle Apparatus
  • Time Factors
  • Tubulin
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Identity

PubMed Central ID

  • PMC2592839

International Standard Serial Number (ISSN)

  • 0021-9525

Digital Object Identifier (DOI)

  • 10.1083/jcb.200807046

PubMed ID

  • 19029337
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Additional Document Info

start page

  • 835

end page

  • 848

volume

  • 183

issue

  • 5

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