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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.

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.

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...

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...

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...

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Related Experiment Video

Updated: Jul 15, 2026

In Vitro Ubiquitination and Deubiquitination Assays of Nucleosomal Histones

In Vitro Ubiquitination and Deubiquitination Assays of Nucleosomal Histones

Published on: July 25, 2019

Structural mechanisms underlying posttranslational modification by ubiquitin-like proteins.

Billy T Dye¹, Brenda A Schulman

¹Howard Hughes Medical Institute, Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, Tennessee 38105, USA.

Annual Review of Biophysics and Biomolecular Structure

|May 5, 2007

Summary

Ubiquitin-like proteins (Ubls) regulate eukaryotic protein function by attaching to targets. Structural studies of E1-E2-E3 enzyme cascades reveal modular building blocks and mechanisms of Ubl modification.

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Area of Science:

Biochemistry
Molecular Biology
Cell Biology

Background:

Covalent attachment of ubiquitin-like proteins (Ubls) is a key regulatory mechanism in eukaryotes.
Ubiquitin, SUMO, NEDD8, and ISG15 are structurally related Ubls that modify numerous proteins.
Ubl modifications impact protein half-life, localization, activity, and interactions.

Purpose of the Study:

To elucidate the structural basis of Ubl conjugation.
To understand the mechanistic insights of E1-E2-E3 enzyme cascades.
To explore the diversity of Ubl modification pathways.

Main Methods:

Structural biology techniques (e.g., X-ray crystallography, cryo-EM).
Biochemical assays to study enzyme kinetics and interactions.
Bioinformatics analysis of protein structures and sequences.

Main Results:

Structures of multiple E1-E2-E3 enzyme complexes have been determined.
These structures reveal conserved modular components within the conjugation machinery.
Insights into the specificity and regulation of Ubl transfer are provided.

Conclusions:

The structural data provides a mechanistic understanding of Ubl conjugation.
Modular architecture facilitates the specific attachment of diverse Ubls to target proteins.
This work lays the foundation for further investigation into Ubl-mediated regulation.