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Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
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Updated: Nov 21, 2025

High-resolution Imaging and Analysis of Individual Astral Microtubule Dynamics in Budding Yeast
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Spatial variation of microtubule depolymerization in large asters.

Keisuke Ishihara1,2,3,4, Franziska Decker1,2,3,4, Paulo Caldas5

  • 1Max Planck Institute of Molecular Cell Biology and Genetics, 01307 Dresden, Germany.

Molecular Biology of the Cell
|January 13, 2021
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Summary
This summary is machine-generated.

Microtubule depolymerization rates are spatially regulated in Xenopus egg extracts, being higher inside asters. This suggests microtubule-associated proteins (MAPs) limit assembly by inhibiting depolymerization.

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Area of Science:

  • Cell Biology
  • Cytoskeletal Dynamics
  • Biophysics

Background:

  • Microtubule dynamics are crucial for cellular organization.
  • Measuring microtubule plus-end depolymerization rates is challenging.
  • The role of depolymerization in spatial organization remains unclear.

Purpose of the Study:

  • To measure microtubule plus-end depolymerization rates in Xenopus egg asters.
  • To investigate the spatial regulation of microtubule dynamics.
  • To understand the mechanisms controlling aster growth.

Main Methods:

  • Utilized time-difference imaging to track microtubule plus ends.
  • Quantified depolymerization, polymerization, and catastrophe rates.
  • Applied a limiting component model for interpretation.

Main Results:

  • Observed significantly higher depolymerization rates in the aster interior compared to the periphery.
  • Found minimal spatial regulation of polymerization or catastrophe rates.
  • Tubulin was not significantly depleted in the aster interior (steady-state polymer fraction ~30%).

Conclusions:

  • Microtubule depolymerization is spatially regulated within egg asters.
  • A limiting component model suggests microtubule-associated proteins (MAPs) inhibit depolymerization.
  • Xenopus egg asters are adapted for low microtubule density, regulated by MAPs.