The elasticity of motor-microtubule bundles and shape of the mitotic spindle

B. Rubinstein, K. Larripa, P. Sommi, A. Mogilner

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

In the process of cell division, chromosomes are segregated by mitotic spindles - bipolar microtubule arrays that have a characteristic fusiform shape. Mitotic spindle function is based on motor-generated forces of hundreds of piconewtons. These forces have to deform the spindle, yet the role of microtubule elastic deformations in the spindle remains unclear. Here we solve equations of elasticity theory for spindle microtubules, compare the solutions with shapes of early Drosophila embryo spindles and discuss the biophysical and cell biological implications of this analysis. The model suggests that microtubule bundles in the spindle behave like effective compressed springs with stiffness of the order of tens of piconewtons per micron, that microtubule elasticity limits the motors' power, and that clamping and cross-linking of microtubules are needed to transduce the motors' forces in the spindle. Some data are hard to reconcile with the model predictions, suggesting that cytoskeletal structures laterally reinforce the spindle and/or that rapid microtubule turnover relieves the elastic stresses.

Original languageEnglish (US)
Article number016005
JournalPhysical Biology
Volume6
Issue number1
DOIs
StatePublished - 2009

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Spindle Apparatus
Elasticity
Microtubules
Constriction
Cell Division
Drosophila
Embryonic Structures
Chromosomes

ASJC Scopus subject areas

  • Biophysics
  • Molecular Biology
  • Cell Biology
  • Structural Biology

Cite this

The elasticity of motor-microtubule bundles and shape of the mitotic spindle. / Rubinstein, B.; Larripa, K.; Sommi, P.; Mogilner, A.

In: Physical Biology, Vol. 6, No. 1, 016005, 2009.

Research output: Contribution to journalArticle

Rubinstein, B. ; Larripa, K. ; Sommi, P. ; Mogilner, A. / The elasticity of motor-microtubule bundles and shape of the mitotic spindle. In: Physical Biology. 2009 ; Vol. 6, No. 1.
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