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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...
M-Cdk Drives Transition Into Mitosis02:15

M-Cdk Drives Transition Into Mitosis

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.
M cyclin...
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...
DNA Damage Can Stall the Cell Cycle02:36

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The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...

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Study of the DNA Damage Checkpoint using Xenopus Egg Extracts
10:55

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Published on: November 5, 2012

Methods for studying checkpoint kinases - Chk1.

Claudia Tapia-Alveal1, Matthew J O'Connell

  • 1Department of Oncological Sciences, Mount Sinai School of Medicine, New York, NY 10029, USA. claudia.tapia-alveal@mssm.edu

Methods in Molecular Biology (Clifton, N.J.)
|August 27, 2011
PubMed
Summary
This summary is machine-generated.

The G2 DNA damage checkpoint prevents cell death by halting mitosis when DNA is damaged. This process involves the Chk1 protein kinase, and its phosphorylation status serves as a key marker for activation.

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Last Updated: May 29, 2026

Study of the DNA Damage Checkpoint using Xenopus Egg Extracts
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Published on: November 5, 2012

Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay
12:26

Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay

Published on: May 3, 2018

Identification of Novel CK2 Kinase Substrates Using a Versatile Biochemical Approach
11:11

Identification of Novel CK2 Kinase Substrates Using a Versatile Biochemical Approach

Published on: February 21, 2019

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Cell cycle progression requires accurate DNA replication and repair to maintain genome stability.
  • The G2 DNA damage checkpoint is a critical safeguard that prevents cells from entering mitosis with unrepaired DNA.
  • Mitotic cyclin-dependent kinase (M-CDK) activation must be inhibited during the G2 phase to allow for DNA repair.

Purpose of the Study:

  • To investigate the role of the Chk1 protein kinase in the G2 DNA damage checkpoint.
  • To identify key regulatory sites within Chk1 that control its activation and inactivation.
  • To establish phospho-specific antibodies as a reliable method for monitoring Chk1 activation.

Main Methods:

  • Utilized knowledge of protein kinase structure and function.
  • Focused on the Chk1 protein serine-threonine kinase.
  • Employed phospho-specific antibodies to detect phosphorylation events at Serine-317 (S317) and Serine-345 (S345) on Chk1.

Main Results:

  • Chk1 is the effector kinase of the G2 DNA damage checkpoint.
  • Phosphorylation of S317 and S345 within Chk1's regulatory domain indicates its active state.
  • Dephosphorylation of these sites leads to Chk1 inactivation and subsequent mitotic entry.
  • Phospho-specific antibodies provide a sensitive and straightforward method to assess Chk1 activation.

Conclusions:

  • Chk1 activation is essential for the G2 DNA damage checkpoint.
  • The phosphorylation status of S317 and S345 on Chk1 serves as a direct marker of checkpoint activity.
  • Phospho-specific antibodies targeting these sites are valuable tools for studying DNA damage response pathways.