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Related Concept Videos

The Spindle Assembly Checkpoint02:19

The Spindle Assembly Checkpoint

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.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
The Spindle Assembly Checkpoint02:19

The Spindle Assembly Checkpoint

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.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
Separation of Sister Chromatids02:17

Separation of Sister Chromatids

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.
At the onset of anaphase, separase, a proteolytic enzyme, is...
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Negative Regulator Molecules

Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
DNA Damage Can Stall the Cell Cycle02:36

DNA Damage Can Stall the Cell Cycle

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...

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Related Experiment Video

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Evaluation of the Spindle Assembly Checkpoint Integrity in Mouse Oocytes
10:09

Evaluation of the Spindle Assembly Checkpoint Integrity in Mouse Oocytes

Published on: September 13, 2022

Spindle checkpoint silencing: PP1 tips the balance.

Bart Lesage1, Junbin Qian, Mathieu Bollen

  • 1Laboratory of Biosignaling and Therapeutics, Department of Molecular Cell Biology, University of Leuven, B-3000 Leuven, Belgium.

Current Biology : CB
|November 15, 2011
PubMed
Summary
This summary is machine-generated.

The spindle checkpoint ensures correct chromosome attachment. Tension at kinetochores recruits protein phosphatase PP1, which silences the checkpoint by dephosphorylating key proteins and opposing Aurora B kinase activity.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • The spindle checkpoint is crucial for accurate cell division, preventing aneuploidy.
  • Aurora B kinase activates the spindle checkpoint, while protein phosphatase PP1 antagonizes it.
  • Kinetochore-microtubule attachments are monitored to ensure proper chromosome segregation.

Purpose of the Study:

  • To elucidate the mechanism by which protein phosphatase PP1 silences the spindle checkpoint.
  • To investigate the role of tension-induced recruitment of PP1 to kinetochores.
  • To understand how PP1 antagonizes Aurora B kinase activity at the kinetochore.

Main Methods:

  • The study likely involved biochemical assays, microscopy, and potentially genetic manipulation to study protein interactions and localization.
  • Analysis of protein phosphorylation states and kinase/phosphatase activities.
  • Investigating the spatial relationship between Aurora B and PP1 at kinetochores under different tension conditions.

Main Results:

  • Chromosome biorientation generates tension, separating Aurora B from its substrates at kinetochores.
  • This tension promotes the dephosphorylation of PP1-interacting proteins (PIPs), creating docking sites for PP1.
  • PP1 is recruited to kinetochores, where it dephosphorylates checkpoint components and Aurora B substrates, leading to checkpoint silencing.
  • PP1 also directly inactivates kinetochore-associated Aurora B and inhibits its centromeric localization.

Conclusions:

  • Tension-dependent recruitment of PP1 to kinetochores is a key mechanism for spindle checkpoint silencing.
  • PP1 acts as a crucial antagonist to Aurora B, ensuring timely anaphase onset.
  • This mechanism highlights the intricate regulation of mitotic surveillance for maintaining genomic stability.