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Updated: Jul 18, 2026
06:03
Development of a Microfluidics-Based Approach for Investigating Microtubule Polymer Mechanics
Published on: May 30, 2025
Microtubule flux: drivers wanted
Benjamin H Kwok1, Tarun M Kapoor
1Laboratory of Chemistry and Cell Biology, The Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.
Current Opinion in Cell Biology
|December 19, 2006
Summary
Microtubule poleward flux, essential for cell division, involves kinesin-5 and kinesin-13 proteins. Advanced imaging reveals their roles in microtubule dynamics and transport towards spindle poles.
Area of Science:
- Cell Biology
- Molecular Motors
- Cytoskeleton Dynamics
Background:
- The metaphase spindle's structure is maintained by microtubule dynamics, including polymerization, depolymerization, and poleward flux.
- Microtubule poleward flux is a conserved process in metazoan cell division, crucial for chromosome segregation.
Purpose of the Study:
- To investigate the roles of Kinesin-5 and Kinesin-13 motor proteins in driving microtubule poleward flux.
- To elucidate the molecular mechanisms underlying microtubule transport dynamics during cell division.
Main Methods:
- Utilized advanced imaging techniques for high temporal and spatial resolution analysis.
- Employed molecular and chemical tools to perturb the functions of Kinesin-5 and Kinesin-13.
Main Results:
- Confirmed the direct involvement of Kinesin-5 and Kinesin-13 in regulating microtubule poleward flux.
- Demonstrated how these kinesins contribute to microtubule polymerization, depolymerization, and sliding.
Conclusions:
- Kinesin-5 and Kinesin-13 are key regulators of microtubule poleward flux.
- Advances in methodology enable detailed examination of motor protein functions in dynamic cellular processes.
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Microtubules form through the end-to-end polymerization of tubulin heterodimers. Kinetochore microtubules originate from the spindle poles, and their plus-ends connect with the kinetochores on sister-chromatids. Ndc80 protein complexes, present on the kinetochore, form low-affinity links with the plus end of these kinetochore microtubules.
Plus-end depolymerization releases tubulin heterodimers from the terminal region of the microtubule. As tubulin subunits are lost, the Ndc80 complexes detach...
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