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Related Experiment Videos

Phosphorylation by CDK1 regulates XMAP215 function in vitro.

R J Vasquez1, D L Gard, L Cassimeris

  • 1Department of Biological Sciences, Lehigh University, Bethlehem, Pennsylvania 18015, USA.

Cell Motility and the Cytoskeleton
|July 28, 1999
PubMed
Summary

XMAP215 protein enhances microtubule dynamics, particularly plus-end elongation. Phosphorylation by CDK1 reduces this elongation-promoting effect, suggesting cell cycle regulation of microtubule assembly.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • XMAP215 is a microtubule-associated protein from Xenopus eggs.
  • It influences microtubule assembly dynamics, primarily at plus ends.
  • XMAP215 phosphorylation during M phase suggests cell cycle-dependent regulation.

Purpose of the Study:

  • To investigate the effect of CDK1-mediated phosphorylation on XMAP215 activity.
  • To determine how XMAP215 phosphorylation impacts microtubule assembly and disassembly rates.

Main Methods:

  • Video-enhanced differential interference contrast (DIC) microscopy.
  • Analysis of purified porcine tubulin assembly dynamics.
  • Assessment of XMAP215 binding to taxol-stabilized microtubules.

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Main Results:

  • Unphosphorylated XMAP215 significantly increased microtubule plus-end elongation rates (4.1-fold).
  • Phosphorylated XMAP215 showed a reduced increase in elongation (2.4-fold).
  • Phosphorylation did not affect the increased shortening rate or XMAP215 binding.

Conclusions:

  • CDK1 phosphorylation modulates XMAP215's ability to promote microtubule elongation.
  • Microtubules assembled in the presence of XMAP215 exhibit faster subsequent shortening.
  • XMAP215 may alter microtubule lattice structure, influencing disassembly dynamics.