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M-Cdk Drives Transition Into Mitosis

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...

M-Cdk Drives Transition Into Mitosis

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...

Positive Regulator Molecules

Positive Regulator Molecules

Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.

Positive Regulator Molecules

Positive Regulator Molecules

To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.

Separation of Sister Chromatids

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...

Inhibition of Cdk Activity

Inhibition of Cdk Activity

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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Related Experiment Video

Updated: May 27, 2026

Manipulation and Analysis of Cell Cycle-Dependent Processes in Budding Yeast

Manipulation and Analysis of Cell Cycle-Dependent Processes in Budding Yeast

Published on: September 26, 2025

A quantitative model for ordered Cdk substrate dephosphorylation during mitotic exit.

Céline Bouchoux¹, Frank Uhlmann

¹Cancer Research UK London Research Institute, Lincoln's Inn Fields Laboratories, London WC2A 3LY, UK.

|November 15, 2011

Summary

This summary is machine-generated.

Mitotic exit involves ordered events. In budding yeast, distinct Cdk substrate dephosphorylation timings reveal how phosphatase and kinase activities control cell cycle progression.

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Last Updated: May 27, 2026

Manipulation and Analysis of Cell Cycle-Dependent Processes in Budding Yeast

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Published on: September 26, 2025

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

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Experimental Approaches to Study Mitochondrial Localization and Function of a Nuclear Cell Cycle Kinase, Cdk1

Experimental Approaches to Study Mitochondrial Localization and Function of a Nuclear Cell Cycle Kinase, Cdk1

Published on: February 25, 2016

Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

Mitotic exit follows sister chromatid separation and involves dephosphorylation of numerous substrates by cyclin-dependent kinase (Cdk).
The precise mechanisms governing the temporal order of these dephosphorylation events during mitotic exit remain poorly understood.

Purpose of the Study:

To investigate the ordered timing of Cdk substrate dephosphorylation during mitotic exit in budding yeast.
To elucidate the mechanisms that establish the temporal sequence of events during mitotic exit.

Main Methods:

In vivo experiments modulating cyclin-dependent kinase (Cdk) and Cdc14 phosphatase activities.
In vitro kinetic analysis of Cdk substrate phosphorylation and dephosphorylation.
Testing different models for the temporal ordering of mitotic exit events.

Main Results:

Dephosphorylation of Cdk substrates involved in sequential mitotic exit events occurs with ordered timing.
The phosphatase to kinase ratio gradually changes during mitotic exit.
Cdk substrates respond to distinct thresholds of this ratio change, leading to ordered dephosphorylation.

Conclusions:

The gradual shift in the phosphatase to kinase ratio provides a quantitative mechanism for ordering mitotic exit events.
This study offers a mechanistic explanation for a quantitative model of cell-cycle progression.
Findings in budding yeast provide insights into fundamental cell cycle regulation.