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M-Cdk Drives Transition Into Mitosis02:15

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 Mitosis02:15

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...
Midrange01:07

Midrange

A somewhat easy to compute quantitative estimate of a data set’s central tendency is its midrange, which is defined as the mean of the minimum and maximum values of an ordered data set.
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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
Cardiomyopathy II: Dilated Cardiomyopathy01:30

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Dilated cardiomyopathy, or DCM, is a progressive myocardial disorder characterized by ventricular chamber dilation and contractile dysfunction.EtiologyVarious factors can cause DCM, including hypertension and heavy alcohol intake, which contribute to the weakening and enlargement of the heart muscle. Viral infections, such as Coxsackievirus B, adenoviruses, and influenza, can lead to DCM by causing inflammation and damage to heart tissue. Certain chemotherapeutic agents, including daunorubicin,...

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Mdm2 widens its repertoire.

Amanda S Coutts1, Nicholas B La Thangue

  • 1Laboratory of Cancer Biology, Division of Medical Sciences, University of Oxford, Oxford, UK.

Cell Cycle (Georgetown, Tex.)
|March 23, 2007
PubMed
Summary

The Mdm2 oncoprotein degrades the p53 co-factor JMY, hindering the tumor suppressor

Area of Science:

  • Molecular Biology
  • Oncology
  • Cellular Biology

Background:

  • p53 is a tumor suppressor protein crucial for DNA repair and apoptosis.
  • Mdm2 is an oncoprotein that regulates p53 stability through proteasomal degradation.
  • p53 activity is tightly controlled, with co-factors playing an increasingly recognized role.

Purpose of the Study:

  • To investigate the role of Mdm2 in regulating p53 co-factors.
  • To elucidate the mechanism by which Mdm2 influences the p53 response.

Main Methods:

  • Ubiquitin-dependent proteasomal degradation assays.
  • Analysis of the interaction between Mdm2, p53, and JMY.
  • Assessment of JMY's effect on p53 activity.

Main Results:

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  • Mdm2 targets JMY, a p53 co-factor, for degradation.
  • Mdm2 antagonizes JMY's ability to enhance the p53 response.
  • Reduced p53-Mdm2 interaction upon DNA damage allows p53 accumulation.

Conclusions:

  • Mdm2 utilizes JMY degradation as a mechanism to suppress the p53 tumor suppressor activity.
  • Transcription co-factors are key targets for Mdm2's oncogenic functions.
  • Understanding Mdm2-JMY interaction offers new therapeutic strategies for cancer.