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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...

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.

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...

S-Cdk Initiates DNA Replication

S-Cdk Initiates DNA Replication

The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of...

The Cell Cycle Control System

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The cell cycle regulation directs how a cell proceeds from one phase to the next and begins mitosis. The cell cycle control system includes intracellular regulatory molecules and external triggers. They provide "stop" or "advance" signals and operate at specific cell cycle stages termed checkpoints to ensure that a particular process is completed before the cell advances to the next phase.
Cyclins and cyclin-dependent kinases (Cdks) are the primary cell cycle regulators and...

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Related Experiment Video

Updated: Nov 13, 2025

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

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

Published on: May 3, 2018

CDK Substrate Phosphorylation and Ordering the Cell Cycle.

Matthew P Swaffer¹, Andrew W Jones², Helen R Flynn³

¹Cell Cycle Laboratory, The Francis Crick Institute, London NW1 1AT, UK.

|December 17, 2016

Summary

This summary is machine-generated.

A single cyclin-dependent kinase (CDK) complex can temporally order cell cycle events by precisely controlling substrate phosphorylation. Rising CDK activity and substrate sensitivity create distinct thresholds, ensuring proper cell division progression.

Keywords:

CDK S phase cell cycle cyclin-dependent kinase kinase mitosis phosphoproteomics phosphorylation

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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

Combining Mitotic Cell Synchronization and High Resolution Confocal Microscopy to Study the Role of Multifunctional Cell Cycle Proteins During Mitosis

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Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

Cell cycle progression relies on cyclin-dependent kinase (CDK) complexes.
The temporal order of S phase and mitosis is crucial for cell division.
Previous models suggested total CDK activity levels, not substrate specificity, dictate cell cycle timing.

Purpose of the Study:

To investigate how CDK substrates are temporally ordered during the cell cycle.
To determine the role of CDK activity levels and substrate sensitivity in cell cycle regulation.
To analyze CDK substrate phosphorylation patterns in fission yeast.

Main Methods:

Phosphoproteomics-based systems analysis of CDK substrates in fission yeast.
Comparative analysis with wild-type cells.
Measurement of CDK activity and substrate phosphorylation dynamics.

Main Results:

A single cyclin-CDK complex can temporally order the phosphorylation of different substrates.
Rising CDK activity and differential substrate sensitivity create specific activity thresholds.
Rapid phosphorylation turnover ensures distinct substrate-specific activity thresholds for cell cycle events.

Conclusions:

CDK activity levels and substrate sensitivity are key mechanisms for temporal ordering of cell cycle events.
Cyclin-substrate specificity and activity thresholds work together to fine-tune phosphorylation patterns.
This mechanism ensures the precise execution of downstream cell cycle events.