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Related Concept Videos

Attachment of Sister Chromatids02:57

Attachment of Sister Chromatids

As cells progress into mitosis, the nuclear envelope breaks down, and the condensed chromosomes are exposed to the array of bipolar microtubules of the mitotic spindle. The kinetochore, a large, disc-shaped protein complex, is present at the centromere region of the sister chromatids and acts as a binding site for the microtubules.  Usually, the plus-end of a single microtubule is embedded within the kinetochore. However, some kinetochores first establish lateral contact with the side-wall of a...
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Disassembly of Intermediate Filaments01:35

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Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
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Published on: May 3, 2018

4D-networking by mitotic phosphatases.

Junbin Qian1, Claudia Winkler, Mathieu Bollen

  • 1Laboratory of Biosignaling & Therapeutics, Department of Cellular and Molecular Medicine, University of Leuven, B-3000 Leuven, Belgium.

Current Opinion in Cell Biology
|July 16, 2013
PubMed
Summary
This summary is machine-generated.

Protein phosphatases control cell division by regulating protein phosphorylation and dephosphorylation. These enzymes are crucial for both entering and exiting mitosis, ensuring accurate cell cycle progression.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Faithful cell division (mitosis) relies on precise protein phosphorylation and dephosphorylation.
  • Protein kinases and phosphatases form complex regulatory networks crucial for cell cycle transitions.

Purpose of the Study:

  • To review the role of protein phosphatases in modulating mitotic entry and exit.
  • To highlight how phosphatases organize dephosphorylation events and control dynamic mitotic processes.

Main Methods:

  • Literature review of recent evidence on protein phosphatases in mitosis.
  • Analysis of the regulatory circuits involving kinases and phosphatases.

Main Results:

  • Protein phosphatases act as key regulators of both mitotic entry and exit.
  • They spatiotemporally control key regulatory proteins, opposing kinase activity.
  • Phosphatases are essential for dynamic mitotic events like chromosome congression and checkpoint signaling.

Conclusions:

  • Mitotic protein phosphatases are critical modulators of cell division.
  • Their tight regulation within phosphorylation networks ensures accurate mitosis.