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Directly Measuring Forces Within Reconstituted Active Microtubule Bundles
Published on: May 10, 2022
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Measuring kinetochore-microtubule interaction in vitro.
Jonathan W Driver1, Andrew F Powers1, Krishna K Sarangapani1
1Department of Physiology and Biophysics, University of Washington School of Medicine, Seattle, Washington, USA.
Methods in Enzymology
|March 18, 2014
Summary
Researchers purified kinetochores, the protein complexes linking chromosomes and microtubules during cell division. They developed assays to measure microtubule attachment strength, aiding studies on correcting errors that cause chromosome missegregation.
Area of Science:
- Cell Biology
- Molecular Biology
- Biophysics
Background:
- Proteins and protein complexes perform vital functions in vivo.
- In vitro reconstitution allows for the study of cause-effect relationships between biomolecules.
- Kinetochores are crucial protein complexes that mediate chromosome-microtubule attachment during mitosis.
Purpose of the Study:
- To describe a protocol for purifying kinetochores.
- To quantitatively assay the microtubule-binding characteristics of purified kinetochores.
- To establish a platform for studying how kinases affect kinetochore-microtubule attachments.
Main Methods:
- Purification of kinetochore protein complexes.
- Differential interference contrast (DIC) imaging.
- Laser trapping microscopy to measure microtubule attachment and load-bearing capacity.
Main Results:
- Successful purification of functional kinetochores.
- Quantitative measurement of microtubule attachment dynamics to kinetochores.
- Characterization of the load-bearing capabilities of kinetochore-microtubule attachments.
Conclusions:
- The developed assays provide a robust platform for investigating kinetochore-microtubule interactions.
- This method facilitates the study of kinase regulation of these attachments, crucial for preventing chromosome missegregation.
- The principles are extensible to studying other force-bearing biological interactions.
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