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Quantitative Microtubule Fractionation Technique to Separate Stable Microtubules, Labile Microtubules, and Free Tubulin in Mouse Tissues
Published on: November 17, 2023
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Chmp4c is required for stable kinetochore-microtubule attachments
Eleni Petsalaki1, Maria Dandoulaki1, George Zachos2
1Department of Biology, University of Crete, Vassilika Vouton, 70013, Heraklion, Greece.
Chromosoma
|July 4, 2018
Summary
Chmp4c protein stabilizes kinetochore-microtubule attachments by interacting with the NDC80 complex and binding microtubules. This ensures accurate chromosome segregation during cell division.
Area of Science:
- Cell Biology
- Molecular Biology
- Genetics
Background:
- Stable kinetochore-microtubule attachments are crucial for accurate chromosome segregation in human cells, a process dependent on the NDC80 complex.
- Previous research indicated Chmp4c protein localizes to kinetochores and promotes cold-stable kinetochore microtubules, faithful chromosome alignment, and segregation.
Purpose of the Study:
- To investigate the association between Chmp4c and the NDC80 complex.
- To determine Chmp4c's role in kinetochore-microtubule stability and chromosome segregation.
Main Methods:
- Co-immunoprecipitation to assess protein interactions.
- Immunofluorescence microscopy to analyze protein localization.
- In vitro microtubule binding and bundling assays.
- Depletion studies using siRNA to evaluate protein function.
Main Results:
- Chmp4c associates with NDC80 components Hec1 and Nuf2, promoting NDC80 stability and Hec1-Nuf2 kinetochore localization.
- Chmp4c depletion does not disrupt overall kinetochore complex integrity.
- Nuf2 is required for Chmp4c kinetochore targeting, but Chmp4c also stabilizes microtubules independently of Hec1-Nuf2 localization.
- Chmp4c binds and bundles microtubules in vitro via its N-terminal region, which is essential for cold-stable microtubules and chromosome alignment.
Conclusions:
- Chmp4c is a novel protein that enhances kinetochore-microtubule stability by regulating Hec1-Nuf2 localization and directly binding spindle microtubules.
- These functions of Chmp4c are critical for accurate chromosome segregation in human cells.
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