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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.

Anaphase Promoting Complex

Anaphase Promoting Complex

The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...

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...

Regulated Protein Degradation

Regulated Protein Degradation

It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...

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Related Experiment Video

Updated: Jul 18, 2026

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

Fbw7 isoform interaction contributes to cyclin E proteolysis.

Wei Zhang¹, Deanna M Koepp

¹Department of Genetics, Cell Biology and Development, University of Minnesota - Twin Cities, Minneapolis, MN, USA.

Molecular Cancer Research : MCR

|December 26, 2006

Summary

The Fbw7 tumor suppressor protein, crucial for cell growth, interacts via its N-terminus. This interaction is vital for efficient cyclin E turnover and proper cell cycle regulation.

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Area of Science:

Cell Biology
Molecular Biology
Cancer Research

Background:

The ubiquitin proteasome system regulates cell growth and proliferation.
Fbw7 is a tumor suppressor protein targeting proto-oncogenes like cyclin E for destruction.
Mammalian Fbw7 exists as three splice variants with unique N-termini.

Purpose of the Study:

To investigate the interaction between Fbw7 splice variants.
To determine the role of the N-terminal region and D domain in Fbw7 function.
To elucidate the importance of Fbw7 isoform interaction in cyclin E turnover.

Main Methods:

Analysis of Fbw7 splice variant interactions.
Characterization of Fbw7 mutants lacking the D domain or N-terminal binding region.
Assessment of cyclin E protein turnover rates in Fbw7 mutants.

Main Results:

Fbw7 splice variants interact via a common N-terminal region.
Mutants lacking the D domain region cannot bind other Fbw7 isoforms.
Fbw7 mutants lacking the N-terminal interaction region show reduced cyclin E turnover.

Conclusions:

Fbw7 isoform interaction, mediated by the N-terminal region, is essential for efficient cyclin E protein turnover.
This interaction is critical for the tumor-suppressive function of Fbw7.
Understanding Fbw7 regulation provides insights into tumorigenesis.