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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...

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...

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.

Positive Regulator Molecules

Positive Regulator Molecules

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

DNA Damage Can Stall the Cell Cycle

DNA Damage Can Stall the Cell Cycle

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...

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Related Experiment Video

Updated: Jun 22, 2026

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

Znhit1 causes cell cycle arrest and down-regulates CDK6 expression.

Zhengmin Yang¹, Yonghao Cao, Xiaoyan Zhu

¹Laboratory of Molecular Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 320 Yueyang Road, Shanghai 200031, China.

Biochemical and Biophysical Research Communications

|June 9, 2009

Summary

Znhit1, a novel zinc finger protein, inhibits cell proliferation by down-regulating Cyclin-dependent kinase 6 (CDK6) expression. This regulation impacts T cell proliferation, highlighting Znhit1

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Last Updated: Jun 22, 2026

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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:

Molecular Biology
Cell Cycle Regulation
Immunology

Background:

Cyclin-dependent kinase 6 (CDK6) is crucial for G1 cell cycle progression and T cell function.
Znhit1 is a newly identified zinc finger protein with a conserved Zf-HIT domain.

Purpose of the Study:

To investigate the role of Znhit1 in cell cycle regulation.
To determine the effect of Znhit1 on CDK6 expression and T cell proliferation.

Main Methods:

Cell cycle arrest assays in NIH/3T3 cells.
Analysis of CDK6 gene expression and histone acetylation.
Validation in transgenic mouse models for T cell proliferation.

Main Results:

Znhit1 induced G1 cell cycle arrest in NIH/3T3 cells.
Znhit1 significantly down-regulated CDK6 expression through transcriptional repression.
Decreased histone H4 acetylation at the CDK6 promoter correlated with Znhit1 activity.
Znhit1 negatively regulated T cell proliferation in vivo.

Conclusions:

Znhit1 acts as a negative regulator of CDK6.
Znhit1 plays a significant role in controlling cell proliferation, particularly in T cells.