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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...

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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Use of Recombinant Fusion Proteins in a Fluorescent Protease Assay Platform and Their In-gel Renaturation

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Structure-Based Design of Fluorogenic Substrates Selective for Human Proteasome Subunits.

Elmer Maurits¹, Christian G Degeling¹, Alexei F Kisselev²

¹Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333 CC, Leiden, The Netherlands.

Chembiochem : a European Journal of Chemical Biology

|June 30, 2020

Summary

This summary is machine-generated.

Researchers developed new fluorogenic substrates to precisely measure the activity of specific proteasome subunits. These tools aid research into proteasome inhibitors for cancer and autoimmune diseases.

Keywords:

Michaelis-Menten kinetics fluorogenic substrates immunoproteasome kinetics proteasome

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Published on: April 9, 2018

Area of Science:

Biochemistry
Molecular Biology
Drug Discovery

Background:

Proteasomes are critical drug targets for hematological cancers and autoimmune diseases.
Existing proteasome inhibitors target specific catalytic subunits (β1c, β1i, β2c, β2i, β5c, β5i).
Development of selective assays is crucial for understanding proteasome function and inhibitor efficacy.

Purpose of the Study:

To design and synthesize novel fluorogenic substrates.
To enable selective measurement of individual proteasome catalytic subunit activities.
To expand the research toolbox for proteasome studies.

Main Methods:

Modification of mechanism-based proteasome inhibitors by replacing electrophiles with fluorogenic leaving groups.
Synthesis of novel fluorogenic substrates based on oligopeptide recognition elements.
Assay development to measure proteasome activity in Raji cell lysates and purified 20S proteasomes.

Main Results:

Effective fluorogenic substrates were identified for β1c, β1i, β2c, and β5i subunits.
Substrates reported on the catalytic activity targeted by parent inhibitors.
Low activity was observed for β5c and β2i subunit-selective substrates, indicating limitations.

Conclusions:

New subunit-selective fluorogenic substrates were successfully developed for key proteasome components.
These substrates enhance the ability to study individual proteasome activities.
The findings contribute valuable tools for proteasome-targeted therapeutic research.