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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...

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...

The Proteasome

The Proteasome

Lysosomal Hydrolases

Lysosomal Hydrolases

Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...

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...

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Related Experiment Video

Updated: Mar 27, 2026

In Vitro Analysis of E3 Ubiquitin Ligase Function

In Vitro Analysis of E3 Ubiquitin Ligase Function

Published on: May 14, 2021

Ubiquitin in Human Diseases: Pathophysiology, Dysfunction and Treatment.

Azfar Jamal^1,2, Atahar Husein³, Mohammad Azhar Kamal⁴

¹Department of Biology, College of Science Al-Zulfi, Majmaah University, Al-Majmaah, 11952, Saudi Arabia.

Current Pharmaceutical Design

|March 25, 2026

Summary

The ubiquitin system regulates protein stability and signaling, crucial for cell functions. Dysregulation links to diseases like cancer, but new therapies targeting this system show promise for precision medicine.

Keywords:

Deubiquitinating enzyme E3 ligase PROTACs Proteasome Therapeutic targeting.Ubiquitin

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Related Experiment Videos

Last Updated: Mar 27, 2026

In Vitro Analysis of E3 Ubiquitin Ligase Function

In Vitro Analysis of E3 Ubiquitin Ligase Function

Published on: May 14, 2021

In Vitro Ubiquitination and Deubiquitination Assays of Nucleosomal Histones

In Vitro Ubiquitination and Deubiquitination Assays of Nucleosomal Histones

Published on: July 25, 2019

Method for Measuring the Activity of Deubiquitinating Enzymes in Cell Lines and Tissue Samples

Method for Measuring the Activity of Deubiquitinating Enzymes in Cell Lines and Tissue Samples

Published on: May 10, 2015

Area of Science:

Biochemistry
Molecular Biology
Cell Biology

Background:

The ubiquitin system is vital for protein homeostasis, degradation, and signaling.
Ubiquitin's roles extend beyond proteasomal degradation to cell cycle, DNA repair, and immune responses.
Aberrant ubiquitin pathway regulation is implicated in diverse diseases, including cancer and neurodegeneration.

Purpose of the Study:

To review the pathophysiological roles of ubiquitin in human diseases.
To explore current and emerging therapeutic interventions targeting the ubiquitin system.
To highlight the potential of ubiquitin-based strategies for precision medicine.

Main Methods:

Literature review of recent advancements in structural biology, chemical biology, and proteomics.
Analysis of context-specific interactions within the ubiquitin-proteasome system.
Examination of novel therapeutic modalities like PROTACs and molecular glues.

Main Results:

Enhanced understanding of ubiquitin signaling pathways and disease links.
Identification of new therapeutic targets within the ubiquitin-proteasome system.
Demonstration of target specificity in preclinical and early clinical studies.

Conclusions:

The ubiquitin system is a critical target for treating various human diseases.
Novel therapeutic strategies, including PROTACs and molecular glues, offer potential for targeted protein degradation.
Restoring proteostasis via ubiquitin modulation holds promise for precision medicine, though long-term safety requires further investigation.