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Related Concept Videos

Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein.
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Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the daughter...
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Interactions Between Signaling Pathways

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Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
Negative Regulator Molecules01:23

Negative Regulator Molecules

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Related Experiment Video

Updated: Jun 2, 2026

High Sensitivity Measurement of Transcription Factor-DNA Binding Affinities by Competitive Titration Using Fluorescence Microscopy
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Mechanism-specific signatures for small-molecule p53 activators.

Ingeborg M M van Leeuwen1, Maureen Higgins, Johanna Campbell

  • 1Karolinska Institutet, Stockholm, Sweden.

Cell Cycle (Georgetown, Tex.)
|April 15, 2011
PubMed
Summary

Nutlin-3 rapidly increases p53 protein levels by targeting mdm2, a key regulator. This study compares nutlin-3, tenovin-6, and actinomycin-D, offering insights into p53 pathway modulation for cancer therapy.

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Last Updated: Jun 2, 2026

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Area of Science:

  • Pharmacology
  • Molecular Biology
  • Oncology

Background:

  • Pharmacological activation of the p53 tumor suppressor is advancing towards clinical application.
  • Small molecules targeting p53 are crucial research tools.

Purpose of the Study:

  • To compare the effects of nutlin-3, tenovin-6, and low-dose actinomycin-D on p53 and its regulator mdm2.
  • To analyze the kinetics and molecular mechanisms of p53 activation by these compounds.

Main Methods:

  • Comparative analysis of nutlin-3, tenovin-6, and actinomycin-D.
  • Measurement of p53 protein levels and mdm2 mRNA synthesis.
  • Assessment of mdm2 conformation and degradation.
  • Evaluation of p53 recovery kinetics.

Main Results:

  • Nutlin-3 rapidly increases p53 protein levels within minutes.
  • Nutlin-3 significantly enhances mdm2 mRNA synthesis, stabilizes mdm2, and protects it from degradation.
  • These effects on mdm2 correlate with rapid p53 level recovery after nutlin-3 withdrawal.
  • Striking differences were observed in the speed of p53 induction among the tested compounds.

Conclusions:

  • Nutlin-3 exhibits potent and rapid effects on the p53-mdm2 axis.
  • The observed molecular signatures can help assess the on-target effects of mdm2 inhibitors.
  • Findings have implications for using p53 activators in cancer treatment and mitigating chemotherapy side effects.