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Covalently Linked Protein Regulators

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.

The Proteasome

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...

Regulated Protein Degradation

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 Proliferation

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...

Anaphase Promoting Complex

Anaphase Promoting Complex

The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...

The Proteasome

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...

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Related Experiment Video

Updated: May 12, 2026

Detection of Protein Ubiquitination

Detection of Protein Ubiquitination

Published on: August 19, 2009

A new function for p53 ubiquitination.

Yuko Hirano¹, Ze'ev Ronai

¹Burnham Institute for Medical Research, La Jolla, CA 92130, USA.

|November 18, 2006

Summary

This summary is machine-generated.

The tumor suppressor protein p53

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Last Updated: May 12, 2026

Detection of Protein Ubiquitination

Detection of Protein Ubiquitination

Published on: August 19, 2009

In Vitro Analysis of E3 Ubiquitin Ligase Function

In Vitro Analysis of E3 Ubiquitin Ligase Function

Published on: May 14, 2021

Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Purification of Ubiquitinated p53 Proteins from Mammalian Cells

Published on: March 21, 2022

Area of Science:

Molecular Biology
Cellular Biology
Biochemistry

Background:

The protein p53 is a crucial tumor suppressor.
Cellular levels of p53 are regulated by ubiquitin-dependent degradation.
The precise role of p53 ubiquitination in cellular processes remains incompletely understood.

Purpose of the Study:

To investigate the role of p53 ubiquitination in cellular processes.
To determine whether p53 ubiquitination affects protein stability or transcriptional activity.

Main Methods:

The study utilized biochemical assays to examine p53 ubiquitination.
Techniques included analyzing p53 protein levels and transcriptional activity.

Main Results:

p53 ubiquitination was found to promote transcriptional activation.
Contrary to expectations, ubiquitination did not appear to target p53 for degradation.
These findings suggest a novel function for p53 ubiquitination.

Conclusions:

p53 ubiquitination plays a role in activating p53's transcriptional function.
This mechanism provides new insights into p53's regulation.
Understanding this process may illuminate p53's involvement in growth arrest and apoptosis.