Related Experiment Video

Updated: Jan 25, 2026

Purification of Ubiquitinated p53 Proteins from Mammalian Cells
10:55

Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Published on: March 21, 2022

2.7K

Redundant down-regulation pathways for p53

M Cinelli1, L Magnelli, V Chiarugi

  • 1Laboratory of Molecular Biology, University of Florence, Italy.

Pharmacological Research
|May 8, 1998
PubMed

Insights

This review highlights redundant p53 down-regulation pathways, focusing on calpain and ubiquitin systems. It also examines the MDM2 feedback loop and p53 regulation after irradiation.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Biochemistry

Background:

  • The p53 protein is a critical tumor suppressor.
  • Dysregulation of p53 contributes to cancer development.
  • Understanding p53 regulation is key to therapeutic strategies.

Purpose of the Study:

  • To review the redundant mechanisms for p53 down-regulation.
  • To elucidate the roles of calpain and ubiquitin-dependent pathways in p53 degradation.
  • To discuss p53 regulation in response to DNA damage.

Main Methods:

  • Literature review of existing studies on p53.
  • Analysis of molecular pathways involved in p53 degradation.
  • Discussion of post-translational modifications of p53.

Main Results:

  • Multiple redundant pathways exist for p53 down-regulation.
  • Calpains and ubiquitin-dependent systems are major degradative pathways for p53.
  • The MDM2 feedback loop plays a significant role in p53 regulation.
  • Phosphorylation and dephosphorylation control p53 activity.
  • Irradiation can prolong p53 half-life through specific mechanisms.

Conclusions:

  • The cell employs multiple, overlapping systems to control p53 levels.
  • Targeting these degradation pathways could offer novel cancer therapies.
  • Further research into p53 regulation is warranted for therapeutic development.

More Related Videos

siRNA Screening to Identify Ubiquitin and Ubiquitin-like System Regulators of Biological Pathways in Cultured Mammalian Cells10:43

siRNA Screening to Identify Ubiquitin and Ubiquitin-like System Regulators of Biological Pathways in Cultured Mammalian Cells

Published on: May 24, 2014

11.8K
A Reverse Genetic Approach to Test Functional Redundancy During Embryogenesis06:59

A Reverse Genetic Approach to Test Functional Redundancy During Embryogenesis

Published on: August 11, 2010

12.4K

Related Concept Videos

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.
38.3K
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....
8.9K
GTPases and their Regulation02:14

GTPases and their Regulation

Guanine nucleotide-binding proteins (G-proteins), also known as GTPases, are a superfamily of proteins that regulate many cellular processes, such as cell signaling, vesicular transport, and the regulation of cell shape and motility. Mutation or dysfunction of these proteins can lead to disease. There are around 40,000 known G-proteins that can broadly be classified into two groups ‒  small G-proteins consisting of a single domain and large multi-domain G-proteins.
Large G-proteins,...
9.8K
C4 Pathway and CAM01:27

C4 Pathway and CAM

Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
C4 Pathway
The C4 pathway is used by plants such as...
48.9K
Epigenetic Regulation01:46

Epigenetic Regulation

Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
33.5K
Regulated Protein Degradation02:58

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...
8.8K