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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...

Mitochondrial Precursor Proteins

Mitochondrial Precursor Proteins

Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70 chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial precursors...

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.

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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Related Experiment Video

Updated: Jun 4, 2026

Imaging the Intracellular Trafficking of APP with Photoactivatable GFP

Imaging the Intracellular Trafficking of APP with Photoactivatable GFP

Published on: October 17, 2015

Normal proteolytic processing of the presenilins.

H Hartmann¹, B A Yankner

¹Department of Pharmacology, Biocenter Niederursel, University of Frankfurt, Germany.

Methods in Molecular Medicine

|February 15, 2011

Summary

Familial Alzheimer's disease (AD) is often caused by mutations in presenilin genes (PS1, PS2). These genes encode proteins integral to the endoplasmic reticulum and Golgi apparatus, with mutations linked to AD pathogenesis.

Area of Science:

Genetics
Neuroscience
Molecular Biology

Background:

Familial Alzheimer's disease (AD) is predominantly linked to mutations in presenilin genes.
Presenilin 1 (PS1) and Presenilin 2 (PS2) genes are implicated in the majority of early-onset familial AD cases.

Purpose of the Study:

To investigate the genetic basis of familial Alzheimer's disease.
To understand the structural and functional implications of presenilin mutations.

Main Methods:

Analysis of familial Alzheimer's disease (AD) cases.
Genetic sequencing of presenilin 1 (PS1) and presenilin 2 (PS2) genes.
Bioinformatic analysis of protein structure and transmembrane domains.

Main Results:

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Over 40 disease-causing mutations identified in PS1, and two in PS2.
Presenilins are predicted to be 6-8 transmembrane proteins located in the endoplasmic reticulum and Golgi.
Mutations are distributed across protein domains, with clusters in the second transmembrane domain and hydrophilic loop.

Conclusions:

Mutations in PS1 and PS2 are key genetic factors in familial Alzheimer's disease.
The structural localization of presenilins suggests their role in cellular processing within the ER and Golgi.
Understanding mutation patterns aids in elucidating AD mechanisms.