Related Experiment Video

Updated: Jun 8, 2026

Purification of Ubiquitinated p53 Proteins from Mammalian Cells
10:55

Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Published on: March 21, 2022

Making sense of ubiquitin ligases that regulate p53

Abhinav K Jain1, Michelle Craig Barton

  • 1Department of Biochemistry and Molecular Biology, University of Texas MD Anderson Cancer Center; Houston, TX, USA.

Cancer Biology & Therapy
|October 9, 2010
PubMed

Insights

The tumor suppressor p53 is a transcription factor regulating cell stability. E3-ubiquitin ligases control p53 levels by targeting it for degradation, offering potential therapeutic strategies.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • The p53 protein is a well-established tumor suppressor.
  • p53 regulates critical cellular processes like cell cycle arrest and apoptosis.
  • Emerging research highlights p53's broader roles in homeostasis, metabolism, fertility, and differentiation.

Purpose of the Study:

  • To review the diverse E3-ubiquitin ligase proteins that target p53 for degradation.
  • To elucidate the similarities and differences among these E3-ubiquitin ligases.
  • To explore potential specialization among E3-ligases in regulating p53 protein levels.

Main Methods:

  • Literature review of studies on p53 regulation and E3-ubiquitin ligases.
  • Analysis of mechanisms controlling p53 protein stability.
  • Comparative examination of various E3-ubiquitin ligase functions.

Main Results:

  • p53 functions as a transcription factor, with its activity dependent on protein stability.
  • An increasing number of E3-ubiquitin ligases target p53 for ubiquitination and subsequent degradation.
  • These ligases play a crucial role in controlling cellular p53 levels.

Conclusions:

  • E3-ubiquitin ligases are key regulators of p53 protein degradation.
  • Understanding the specialized roles of E3-ligases in p53 regulation is essential.
  • Further investigation into E3-ligase mechanisms may reveal novel therapeutic targets for diseases involving p53 dysfunction.

More Related Videos

In Vitro Analysis of E3 Ubiquitin Ligase Function06:06

In Vitro Analysis of E3 Ubiquitin Ligase Function

Published on: May 14, 2021

Detection of Protein Ubiquitination09:00

Detection of Protein Ubiquitination

Published on: August 19, 2009

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.
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...
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...
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...
The Proteasome01:13

The Proteasome

Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...
The Proteasome02:18

The Proteasome

Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...