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Related Experiment Videos

The stathmin/tubulin interaction in vitro

P A Curmi1, S S Andersen, S Lachkar

  • 1INSERM U440, 17 rue du Fer à Moulin, 75005 Paris, France. curmi@infobiogen.fr

The Journal of Biological Chemistry
|October 6, 1997
PubMed
Summary
This summary is machine-generated.

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Stathmin directly binds tubulin, forming a complex that reduces microtubule growth. This tubulin sequestration mechanism explains stathmin's microtubule-destabilizing activity.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Stathmin is a ubiquitous cytoplasmic protein involved in cell signaling and the cell cycle.
  • Stathmin is known to destabilize microtubules, but the underlying molecular mechanisms were unclear.

Purpose of the Study:

  • To elucidate the molecular mechanism by which stathmin destabilizes microtubules.
  • To investigate the direct interaction between stathmin and tubulin.

Main Methods:

  • Surface Plasmon Resonance (SPR)
  • Gel filtration chromatography
  • Analytical ultracentrifugation
  • Western blotting
  • Video microscopy of microtubule dynamics

Related Experiment Videos

Main Results:

  • Stathmin directly interacts with tubulin, forming a 7.7 S complex of one stathmin molecule and two tubulin heterodimers.
  • The stathmin-tubulin interaction is pH and ionic strength dependent, with optimal affinity (Kd = 0.5 microM) at pH 6.5.
  • Phosphorylation mimicry in stathmin (4-Glu mutant) reduced binding affinity, suggesting in vivo regulation by phosphorylation.
  • Stathmin reduced microtubule growth rate without affecting catastrophe frequency, supporting a tubulin sequestration model.

Conclusions:

  • Stathmin destabilizes microtubules by sequestering tubulin heterodimers.
  • The interaction between stathmin and tubulin is quantitatively characterized and sensitive to environmental conditions and phosphorylation.
  • This study provides a molecular basis for stathmin's role in microtubule dynamics.