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Related Concept Videos

Abnormal Proliferation02:23

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...
Negative Regulator Molecules01:23

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.
DNA Damage can Stall the Cell Cycle02:36

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...
DNA Damage Can Stall the Cell Cycle02:36

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...
Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
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...
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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Related Experiment Video

Updated: Jul 7, 2026

Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

ROS and p53: a versatile partnership.

Bin Liu1, Yumin Chen, Daret K St Clair

  • 1Graduate Center for Toxicology, University of Kentucky, Lexington, KY 40506, USA.

Free Radical Biology & Medicine
|February 16, 2008
PubMed
Summary

The tumor suppressor protein p53 regulates cellular reactive oxygen species (ROS) generation. ROS, in turn, influence p53

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • The tumor suppressor protein p53 is a critical transcription factor involved in cellular stress responses and genomic stability.
  • Reactive oxygen species (ROS) play a dual role in cells, acting as signaling molecules and toxicants, and are central to redox signaling.
  • The concentration and distribution of p53 influence its cellular functions, with ROS acting as both an activator and mediator of p53-induced apoptosis.

Purpose of the Study:

  • To investigate the newly discovered role of p53 in regulating cellular ROS generation.
  • To examine how ROS modulate the selective transactivation of p53 target genes.
  • To elucidate the intricate interlinks between ROS and p53.

Main Methods:

  • Literature review and synthesis of recent studies on p53 and ROS.

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Visualization of DNA Repair Proteins Interaction by Immunofluorescence
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Visualization of DNA Repair Proteins Interaction by Immunofluorescence

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Last Updated: Jul 7, 2026

Yeast As a Chassis for Developing Functional Assays to Study Human P53
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Yeast As a Chassis for Developing Functional Assays to Study Human P53

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Detection of Aggregation-Prone Behavior in Mutant P53 V157F Breast Cancer Cells Using Multipoint Thioflavin T Fluorescence

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Visualization of DNA Repair Proteins Interaction by Immunofluorescence

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  • Analysis of experimental data on p53-mediated ROS regulation.
  • Investigation of ROS modulation of p53 target gene transactivation.

    • Main Results:

    • p53 actively regulates the generation of cellular ROS.
    • ROS levels and distribution impact p53's ability to selectively activate specific target genes.
    • ROS act as both upstream signals for p53 activation and downstream effectors in apoptosis.

    Conclusions:

    • p53's function is intricately linked to cellular ROS levels.
    • ROS are key mediators in selective p53 transactivation pathways.
    • Understanding the p53-ROS interplay is crucial for comprehending cellular stress responses and apoptosis.