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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: Jun 24, 2026

Identification of Enhancer-Promoter Contacts in Embryoid Bodies by Quantitative Chromosome Conformation Capture (4C)

Identification of Enhancer-Promoter Contacts in Embryoid Bodies by Quantitative Chromosome Conformation Capture (4C)

Published on: April 29, 2020

CDK9/cyclin complexes modulate endoderm induction by direct interaction with Mix.3/mixer.

Haiqing Zhu¹, Joanne R Doherty, Emin Kuliyev

¹Department of Pathology, St Jude Children's Research Hospital, Memphis, Tennessee, USA.

Developmental Dynamics : an Official Publication of the American Association of Anatomists

|April 7, 2009

Summary

Cyclin-dependent kinase 9 (CDK9) interacts with Mix.3 protein, regulating endoderm induction in early vertebrate embryos. CDK9 binding and cyclin partners modulate Mix.3

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Identification of Enhancer-Promoter Contacts in Embryoid Bodies by Quantitative Chromosome Conformation Capture (4C)

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Published on: April 29, 2020

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

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

Published on: December 5, 2017

Area of Science:

Developmental Biology
Molecular Biology
Genetics

Background:

Mix-related homeodomain proteins are crucial for endoderm formation in vertebrate embryos.
Understanding the regulation of these proteins is key to deciphering early developmental processes.

Purpose of the Study:

To identify proteins interacting with Mix.3/mixer.
To investigate the role of these interactions in regulating endoderm induction.

Main Methods:

Yeast two-hybrid screen to identify protein interactors.
Whole embryo transcription reporter assays.
Animal pole explant assays.

Main Results:

Cyclin-dependent kinase 9 (CDK9) was identified as an interactor of Mix.3.
CDK9/cyclin complexes regulate Mix.3 transcriptional activity.
Different cyclin partners (cyclin T2, cyclin K) differentially affect Mix.3 activity and endoderm induction.

Conclusions:

CDK9 binds to the carboxyl terminal domain of Mix.3.
CDK9, through recruitment of specific cyclin partners, modulates the endoderm-inducing activity of Mix.3.
This provides a novel regulatory mechanism for Mix.3 during embryonic development.