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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 (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...

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...

Caspases

Caspases

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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...

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Within a biological system, the DNA encodes the RNA, and the nucleotide sequence in the RNA further defines the amino acid sequence in the protein. This is referred to as “The Central Dogma of Molecular Biology” - a term coined by Francis Crick. Central dogma is a firm principle in biology that defines the flow of genetic information within any life form. The two fundamental steps in central dogma are - transcription and translation.
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Related Experiment Video

Updated: Jun 15, 2026

In Vivo Biosensor Tracks Non-apoptotic Caspase Activity in Drosophila

In Vivo Biosensor Tracks Non-apoptotic Caspase Activity in Drosophila

Published on: November 27, 2016

Death proteases: alive and kicking.

Ernst J Woltering¹

¹Wageningen University & Research Center, PO Box 17, 6700 AA Wageningen, The Netherlands. Ernst.woltering@wur.nl <Ernst.woltering@wur.nl>

Trends in Plant Science

|March 6, 2010

Summary

This summary is machine-generated.

Plant programmed cell death (PCD) research reveals new insights. Cell death relies on proteasome function, and a specific enzyme impacts plant cell viability, expanding our understanding of PCD mechanisms.

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Area of Science:

Plant Biology
Molecular Biology
Cellular Processes

Background:

Programmed cell death (PCD) is crucial for plant development and stress response.
The molecular mechanisms regulating plant PCD are not fully understood.
Recent studies have shed light on novel components involved in plant PCD.

Purpose of the Study:

To integrate recent findings on proteasome function and metacaspase substrates in plant PCD.
To highlight the diversity of proteases involved in plant cell death.
To underscore the evolutionary conservation of substrate specificity in plant PCD.

Main Methods:

Review and synthesis of recent research findings.
Analysis of the roles of proteasomes and metacaspases in plant PCD.
Comparative analysis of protease functions and substrate specificities.

Main Results:

Plant cell death is dependent on proper proteasome functioning.
The in vivo substrate of type II metacaspase is linked to plant cell viability.
Plant PCD utilizes a diverse set of proteases with caspase-like activity.

Conclusions:

Proteasomes play a critical role in executing plant programmed cell death.
Metacaspase activity is directly associated with maintaining plant cell viability.
Plant PCD machinery involves structurally diverse proteases exhibiting conserved substrate preferences, akin to caspases.