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Related Experiment Videos

K-loop insertion restores microtubule depolymerizing activity of a "neckless" MCAK mutant.

Yulia Ovechkina1, Michael Wagenbach, Linda Wordeman

  • 1Department of Physiology and Biophysics, University of Washington School of Medicine, Seattle, WA 98195, USA.

The Journal of Cell Biology
|November 26, 2002
PubMed
Summary
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Mitotic centromere-associated kinesin (MCAK) depolymerizes microtubules. Its neck domain, crucial for this activity, interacts electrostatically with tubulin, enabling movement along microtubules.

Area of Science:

  • Cell Biology
  • Molecular Motors
  • Cytoskeleton Dynamics

Background:

  • Mitotic centromere-associated kinesin (MCAK) is a unique kinesin that depolymerizes microtubules (MTs) rather than translocating along them.
  • Motile kinesins utilize a neck domain for functional specificity, but MCAK's neck function was unclear due to its lack of motility.

Purpose of the Study:

  • To investigate the role of the neck domain in MCAK's microtubule depolymerization activity.
  • To determine the mechanism by which MCAK's neck domain influences its function.

Main Methods:

  • Site-directed mutagenesis was used to delete or substitute conserved residues in the MCAK neck domain.
  • Functional assays measured MCAK's microtubule depolymerization activity.
  • Domain swapping experiments were performed by substituting the MCAK neck with the KIF1A K-loop or poly-lysine.

Related Experiment Videos

Main Results:

  • Deletions and substitutions of positively charged residues in the MCAK neck domain significantly reduced MT depolymerization.
  • Replacing the MCAK neck domain with the KIF1A K-loop or poly-lysine rescued the depolymerization activity in neckless mutants.
  • These findings suggest an electrostatic interaction between the MCAK neck and tubulin.

Conclusions:

  • The MCAK neck domain is essential for its microtubule depolymerization activity.
  • An electrostatic interaction, similar to the KIF1A K-loop mechanism, likely mediates MCAK's diffusional translocation along MTs.
  • This interaction may also contribute to the processivity of MCAK-induced MT depolymerization.