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Single depolymerizing and transport kinesins stabilize microtubule ends.

Alexandra Ciorîță1,2, Michael Bugiel1, Swathi Sudhakar1,3

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Single kinesin motors, including yeast Kip3, surprisingly stabilize microtubules rather than depolymerizing them. This challenges previous understanding of motor-driven microtubule dynamics and length regulation.

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Area of Science:

  • Cell Biology
  • Molecular Motors
  • Cytoskeleton Dynamics

Background:

  • Microtubules are essential dynamic filaments regulating intracellular processes like cell division.
  • Kinesin superfamily motors actively modulate microtubule length.
  • Yeast kinesin-8 (Kip3) motors collectively depolymerize microtubules via a force- and length-dependent mechanism.

Purpose of the Study:

  • To investigate the effect of single kinesin motors on microtubule stability.
  • To determine if individual motors can depolymerize microtubules.
  • To elucidate the molecular mechanisms of kinesin-8 and microtubule length regulation.

Main Methods:

  • In vitro assay to measure microtubule depolymerization rates.
  • Label-free interference reflection microscopy.
  • Analysis of spontaneous depolymerization in the presence of kinesins.

Main Results:

  • Both single Kip3 and control kinesin-1 motors unexpectedly stabilized microtubules.
  • This stabilization contradicts the known collective depolymerization activity of Kip3.
  • The interaction is complex and concentration-dependent at microtubule ends.

Conclusions:

  • Single kinesin motors can stabilize microtubules, contrary to expectations for depolymerizing motors.
  • A general microtubule stabilization mechanism by kinesins may exist.
  • Findings offer new insights into kinesin-8 function and microtubule length control.