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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...

Cells Coordinate Growth and Proliferation

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Cell size is a significant factor impacting cellular design, function, and fitness. There exists some internal coordination by which cells double their masses before division, thus, achieving homeostasis. Coordination between cell growth and proliferation depends on the checkpoints in between cell cycle phases. Loss of coordination or failure in the checkpoint mechanism can drive the cell to uncontrolled growth and loss of cellular function. Like dividing cells that coordinate cellular growth,...

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...

The Cell Cycle Control System

The Cell Cycle Control System

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 1, 2025

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

CDK4: Linking cell size to cell cycle control.

Yiqin Ma¹, Bruce A Edgar¹

¹Department of Oncological Sciences, Huntsman Cancer Institute, University of Utah, Salt Lake City, UT, USA.

Developmental Cell

|June 22, 2021

Summary

This summary is machine-generated.

A study reveals cyclin-dependent kinase 4 (CDK4) plays a key role in cell cycle progression by setting the target cell size. This ensures cells reach adequate size before entering the S phase of proliferation.

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Last Updated: Nov 1, 2025

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

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Published on: June 6, 2017

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

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Measuring Cell Cycle Progression Kinetics with Metabolic Labeling and Flow Cytometry

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Published on: May 22, 2012

Area of Science:

Cell Biology
Molecular Biology
Developmental Biology

Background:

Cell proliferation requires a size checkpoint to ensure cells reach a target size before DNA replication.
The precise mechanisms determining this target cell size are not fully understood.

Purpose of the Study:

To identify the specific molecular players involved in regulating target cell size for cell cycle progression.
To elucidate the distinct function of cyclin-dependent kinase 4 (CDK4) in this process.

Main Methods:

Investigated cell cycle regulation and size control mechanisms.
Utilized genetic and biochemical approaches to analyze CDK4 function.

Main Results:

Identified a novel role for CDK4 in determining the specific target cell size.
Demonstrated that CDK4 is crucial for the cell size checkpoint that precedes S phase entry.

Conclusions:

CDK4 has a distinct function beyond its known roles in cell cycle control.
This finding provides new insights into the fundamental mechanisms of cell size regulation during proliferation.