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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...

Caspases

Caspases

Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside cells.

Protein Digestion

Protein Digestion

Protein digestion begins in the stomach, where the highly acidic environment can easily disrupt protein structure by exposing the peptide bonds of polypeptide chains. After polypeptide chains are broken into individual amino acids by a series of digestive enzymes, the amino acids are transported to the liver via the bloodstream to produce energy.

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

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: May 13, 2026

Protease- and Acid-catalyzed Labeling Workflows Employing 18O-enriched Water

Protease- and Acid-catalyzed Labeling Workflows Employing ¹⁸O-enriched Water

Published on: February 20, 2013

Ready, set, cleave: proteases in action.

Seth J Salpeter¹, Galia Blum

¹Institute for Drug Research, School of Pharmacy, The Hebrew University of Jerusalem, Jerusalem 91120, Israel.

Chemistry & Biology

|February 27, 2013

Summary

This summary is machine-generated.

Researchers developed a fluorescent probe to track bacterial protease AvrPphB activity. This tool revealed how protease secretion impacts bacterial pathogenesis.

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Area of Science:

Biochemistry
Molecular Biology
Microbiology

Background:

Activity-based probes (ABPs) are essential tools for monitoring enzyme activity.
These probes covalently bind to active site residues, enabling specific enzyme detection.
Papain-like cysteine proteases are crucial virulence factors in bacterial pathogens.

Discussion:

A novel fluorescent ABP was engineered to target the bacterial cysteine protease AvrPphB.
The probe facilitated the study of AvrPphB secretion and its role in pathogenesis.
This work highlights the utility of ABPs in dissecting bacterial virulence mechanisms.

Key Insights:

Development of a specific fluorescent activity-based probe for AvrPphB.
Demonstration of AvrPphB regulation in bacterial secretion.
Elucidation of AvrPphB's contribution to pathogenesis.

Outlook:

Potential for developing similar probes for other bacterial effector proteases.
Application of these probes to study protease function in diverse bacterial species.
Further investigation into the precise mechanisms of AvrPphB-mediated pathogenesis.