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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 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 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...

Protein Complexes with Interchangeable Parts

Protein Complexes with Interchangeable Parts

Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order to...

The Proteasome Structure

The Proteasome Structure

The ubiquitin-proteasome pathway is a well-known mechanism utilized by eukaryotic cells to remove cytoplasmic proteins that are misfolded, damaged, or no longer needed. In this pathway, the protein that needs to be eliminated undergoes a process called ubiquitination, where a chain of ubiquitin molecules is attached to the 48th lysine residue of the target protein. This ubiquitin modification helps the proteasome distinguish between a target protein and a healthy protein.
The proteasome is an...

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Related Experiment Video

Updated: Jun 14, 2026

Ubiquitin Chain Analysis by Parallel Reaction Monitoring

Ubiquitin Chain Analysis by Parallel Reaction Monitoring

Published on: June 17, 2020

Recent advances in polyubiquitin chain recognition.

Hao Wu¹, Yu-Chih Lo, Su-Chang Lin

¹Department of Biochemistry, Weill Cornell Medical College, 1300 York Avenue, New York, NY 10021, USA.

F1000 Biology Reports

|April 2, 2010

Summary

Polyubiquitin chains act as crucial biological signals. Novel structural insights reveal how cells specifically recognize these chains through diverse interactions.

Area of Science:

Biochemistry
Molecular Biology
Cell Biology

Background:

Polyubiquitin chains are essential signaling molecules in cellular processes.
Understanding their recognition is key to deciphering biological regulation.

Purpose of the Study:

To elucidate novel mechanisms of polyubiquitin chain recognition.
To understand how interaction diversity contributes to specificity.

Main Methods:

Recent structural studies were analyzed.
Interaction interfaces were investigated.

Main Results:

New modes of polyubiquitin chain recognition have been identified.
A diverse set of interactions underlies specific recognition.

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In Vitro Analysis of E3 Ubiquitin Ligase Function

In Vitro Analysis of E3 Ubiquitin Ligase Function

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Comparative Strategies for Ubiquitination Detection in Mammalian Cell Lysates Using SMAD2/SMURF2 as a Model

Comparative Strategies for Ubiquitination Detection in Mammalian Cell Lysates Using SMAD2/SMURF2 as a Model

Published on: April 17, 2026

Related Experiment Videos

Last Updated: Jun 14, 2026

Ubiquitin Chain Analysis by Parallel Reaction Monitoring

Ubiquitin Chain Analysis by Parallel Reaction Monitoring

Published on: June 17, 2020

In Vitro Analysis of E3 Ubiquitin Ligase Function

In Vitro Analysis of E3 Ubiquitin Ligase Function

Published on: May 14, 2021

Comparative Strategies for Ubiquitination Detection in Mammalian Cell Lysates Using SMAD2/SMURF2 as a Model

Comparative Strategies for Ubiquitination Detection in Mammalian Cell Lysates Using SMAD2/SMURF2 as a Model

Published on: April 17, 2026

Conclusions:

Structural and interaction data provide insights into polyubiquitin signaling specificity.
This work advances the understanding of ubiquitin-mediated regulation.