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Related Concept Videos

M-Cdk Drives Transition Into Mitosis02:15

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Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
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At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
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The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
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The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
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Related Experiment Video

Updated: Mar 21, 2026

Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis
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Aurora-A regulates MCRS1 function during mitosis.

Sylvain Meunier1,2, Krystal Timón1,2, Isabelle Vernos1,2,3

  • 1a Center for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology , Barcelona , Spain.

Cell Cycle (Georgetown, Tex.)
|May 19, 2016
PubMed
Summary

Aurora-A kinase phosphorylates MCRS1 in mitosis, regulating its activity. This phosphorylation is crucial for controlling kinetochore fiber microtubule dynamics at the mitotic spindle minus-ends.

Keywords:
Aurora-A kinase; chromosomal microtubules; K-fiber; MCRS1; microtubule minus-end; mitosis; phosphorylation

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The mitotic spindle, essential for cell division, comprises microtubules (MTs) nucleated via various pathways.
  • MCRS1 is a protein that stabilizes chromosome-driven MTs and regulates kinetochore fiber (K-fiber) MT minus-ends dynamics during metaphase.

Purpose of the Study:

  • To investigate the regulation of MCRS1 activity during M-phase.
  • To determine the role of MCRS1 phosphorylation by Aurora-A kinase in mitosis.

Main Methods:

  • Phosphorylation site mapping of MCRS1.
  • Analysis of MCRS1 localization and activity in mitotic cells.
  • Assessment of K-fiber MT minus-ends dynamics.

Main Results:

  • MCRS1 is phosphorylated by Aurora-A kinase at Ser35/36 during mitosis.
  • This phosphorylation does not affect MCRS1 localization to chromosomal MTs or K-fiber minus-ends.
  • Phosphorylation by Aurora-A regulates MCRS1 activity during mitosis.

Conclusions:

  • Aurora-A kinase-mediated phosphorylation of MCRS1 is a key regulatory mechanism in mitosis.
  • This regulation is critical for controlling K-fiber MT minus-ends dynamics.
  • Aurora-A activity fine-tunes MCRS1 function, impacting mitotic spindle organization.