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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...

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...

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...

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: Jul 15, 2026

Development of Inhibitors of Protein-protein Interactions through REPLACE: Application to the Design and Development Non-ATP Competitive CDK Inhibitors

Development of Inhibitors of Protein-protein Interactions through REPLACE: Application to the Design and Development Non-ATP Competitive CDK Inhibitors

Published on: October 26, 2015

Cyclin B and cyclin A confer different substrate recognition properties on CDK2.

Nick R Brown¹, Ed D Lowe, Ed Petri

¹Laboratory of Molecular Biophysics, Department of Biochemistry, University of Oxford, Oxford, UK.

Cell Cycle (Georgetown, Tex.)

|May 15, 2007

Summary

Cyclin B binding alters CDK2 kinase activity, conferring M phase properties and distinct substrate specificity compared to cyclin A. This reveals how different cyclins regulate cell cycle transitions.

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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

Studying Proteolysis of Cyclin B at the Single Cell Level in Whole Cell Populations

Studying Proteolysis of Cyclin B at the Single Cell Level in Whole Cell Populations

Published on: September 17, 2012

Related Experiment Videos

Last Updated: Jul 15, 2026

Development of Inhibitors of Protein-protein Interactions through REPLACE: Application to the Design and Development Non-ATP Competitive CDK Inhibitors

Development of Inhibitors of Protein-protein Interactions through REPLACE: Application to the Design and Development Non-ATP Competitive CDK Inhibitors

Published on: October 26, 2015

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

Studying Proteolysis of Cyclin B at the Single Cell Level in Whole Cell Populations

Studying Proteolysis of Cyclin B at the Single Cell Level in Whole Cell Populations

Published on: September 17, 2012

Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

Cell cycle transitions are regulated by cyclin-dependent protein kinases (CDKs).
Cyclins activate CDKs and dictate substrate recognition.
CDK2 is typically associated with S phase, while cyclin B is linked to M phase.

Purpose of the Study:

To investigate the structural and functional consequences of cyclin B binding to CDK2.
To compare the substrate specificity of CDK2/cyclin B with CDK2/cyclin A.
To understand how cyclin B confers M phase-like properties on CDK2.

Main Methods:

X-ray crystallography to determine the structure of phospho-CDK2/cyclin B.
In vitro kinase assays using nuclear lamin and a p107-derived peptide.
Analysis of substrate phosphorylation motifs and recruitment site interactions.

Main Results:

Cyclin B induces an activated conformation of CDK2 similar to cyclin A.
CDK2/cyclin B phosphorylates substrates at non-canonical SPXX motifs, unlike the canonical SPXK motif for CDK2/cyclin A.
Phosphorylation by CDK2/cyclin B at these sites is independent of the RXL recruitment motif, which binds more weakly with cyclin B than cyclin A.

Conclusions:

Cyclins A and B differentially regulate CDK2 substrate specificity beyond activating the kinase.
Cyclin B confers M phase-like substrate targeting properties on CDK2.
The differences in recruitment sites and substrate motifs highlight the nuanced regulation of cell cycle progression by cyclin-CDK complexes.