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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 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...

Regulated Protein Degradation

Regulated Protein Degradation

Mitochondria

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...

Aging

Aging

Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...

Translocation of Proteins into the Mitochondria

Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...

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Related Experiment Video

Updated: Jun 4, 2025

Quantifying Tissue-Specific Proteostatic Decline in Caenorhabditis elegans

Quantifying Tissue-Specific Proteostatic Decline in Caenorhabditis elegans

Published on: September 7, 2021

Proteasome Activators and Ageing: Restoring Proteostasis Using Small Molecules.

Arun Upadhyay^1,2, Vibhuti Joshi³

¹Department of Neurology, Northwestern University Feinberg School of Medicine, Chicago, IL, USA. arun@iitbhilai.ac.in.

Sub-Cellular Biochemistry

|December 18, 2024

Summary

Targeting the proteasome, a key cellular regulator, shows promise in combating aging. Small molecules activating proteasome function can improve health and delay age-related diseases.

Keywords:

Ageing Lifespan Proteasome Small molecules Ubiquitin-proteasome system

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Area of Science:

Cellular Biology
Biochemistry
Gerontology

Background:

Aging involves declining cellular homeostasis, repair, and increased damage.
Proteasome activity is crucial for maintaining cellular integrity and function.
Genetic studies in model organisms show manipulating proteasomes can extend lifespan.

Purpose of the Study:

To provide an overview of the proteasome complex and its functions.
To review strategies for modulating proteasome activity.
To discuss small molecule-based approaches for healthspan extension.

Main Methods:

Review of existing literature on proteasome structure, function, and regulation.
Analysis of genetic studies manipulating proteasomal activities.
Exploration of small molecule proteasome activators.

Main Results:

The proteasome is a multi-enzyme complex vital for protein degradation.
Modulating proteasome efficiency impacts proteostasis and cellular health.
Small molecule proteasome activators show potential in ameliorating stress and extending lifespan.

Conclusions:

Proteasome activation is a viable strategy to improve organismal health.
Targeting the proteasome may delay age-associated pathologies.
Small molecule activators offer a promising therapeutic avenue for aging.