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Positive Regulator Molecules

Positive Regulator Molecules

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

Negative Regulator Molecules

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.

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.

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...

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...

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Related Experiment Video

Updated: May 13, 2026

Analysis of Cell Cycle Position in Mammalian Cells

Analysis of Cell Cycle Position in Mammalian Cells

Published on: January 21, 2012

Cyclin C/cdk3 promotes Rb-dependent G0 exit.

Shengjun Ren¹, Barrett J Rollins

¹Department of Medical Oncology, Dana-Farber Cancer Institute, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.

|April 16, 2004

Summary

This summary is machine-generated.

Cellular G0 exit involves cyclin C and cdk3, which phosphorylate pRb to enable cell cycle re-entry. This distinct cyclin/cdk combination regulates the G0/G1 transition, similar to G1/S phase regulation.

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Last Updated: May 13, 2026

Analysis of Cell Cycle Position in Mammalian Cells

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Published on: January 21, 2012

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

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Studying Cell Cycle-regulated Gene Expression by Two Complementary Cell Synchronization Protocols

Studying Cell Cycle-regulated Gene Expression by Two Complementary Cell Synchronization Protocols

Published on: June 6, 2017

Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

The cell cycle involves distinct phases, including G0 (resting state) and G1 (preparation for DNA synthesis).
While the G1/S transition is well-understood, regulation of the G0/G1 transition remains largely unknown.
Retinoblastoma protein (pRb) inactivation is crucial for cell cycle re-entry from G0.

Purpose of the Study:

To investigate the molecular mechanisms regulating the G0/G1 transition.
To identify key proteins involved in pRb phosphorylation during G0 exit.
To elucidate the role of cyclin C and its associated kinases in G0/G1 regulation.

Main Methods:

Analysis of cyclin C mRNA levels during G0 exit.
Investigating the interaction of cyclin C with cyclin-dependent kinases (cdks).
Assessing the effect of cyclin C/cdk3 complex on pRb phosphorylation at specific sites (S807/811).

Main Results:

Cyclin C levels peak during G0 exit, suggesting a role in this process.
A non-cdk8-associated pool of cyclin C forms a complex with cdk3.
This cyclin C/cdk3 complex phosphorylates pRb at S807/811, which is essential for efficient G0 exit.

Conclusions:

The G0/G1 transition is regulated by a distinct cyclin/cdk combination, specifically cyclin C/cdk3.
Phosphorylation of pRb at S807/811 by cyclin C/cdk3 is a critical step for cells to exit G0.
This finding reveals an analogous regulatory mechanism to the G1/S transition but with a different cyclin/cdk pair.