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Related Concept Videos

The Proteasome01:13

The Proteasome

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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...
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The Proteasome Structure01:17

The Proteasome Structure

842
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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Mitochondria01:37

Mitochondria

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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,...
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Regulated Protein Degradation02:58

Regulated Protein Degradation

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It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
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The Effect of Aging on Tissues01:19

The Effect of Aging on Tissues

2.2K
Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
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Proteins: From Genes to Degradation02:11

Proteins: From Genes to Degradation

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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.
Transcription is the synthesis of RNA...
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Ubiquitin-Proteasome-Mediated Protein Degradation and Disorders of the Central Nervous System.

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Related Experiment Video

Updated: Aug 15, 2025

Monitoring of Ubiquitin-proteasome Activity in Living Cells Using a Degron dgn-destabilized Green Fluorescent Protein GFP-based Reporter Protein
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Monitoring of Ubiquitin-proteasome Activity in Living Cells Using a Degron dgn-destabilized Green Fluorescent Protein GFP-based Reporter Protein

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The Proteasome and Ageing.

Ashok N Hegde1, Lindsey M Duke2, Logan E Timm2

  • 1Department of Biological and Environmental Sciences, Georgia College and State University, Milledgeville, GA, USA. ashok.hegde@gcsu.edu.

Sub-Cellular Biochemistry
|January 4, 2023
PubMed
Summary
This summary is machine-generated.

The proteasome, a cellular complex, degrades damaged proteins but declines with age, leading to protein accumulation. This decline may link to aging and neurodegenerative diseases, impacting longevity.

Keywords:
LongevityMisfolded proteinsNeurodegenerationOxidative damageProtein degradationProteolysisProteostasisSenescenceUbiquitin

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biogerontology

Background:

  • The proteasome is a vital cellular complex responsible for degrading proteins, essential for both normal physiological regulation and cellular protection against damage.
  • Protein damage can arise from internal sources (e.g., reactive oxygen species) and external factors (e.g., UV radiation), with the proteasome playing a key role in eliminating these damaged proteins.
  • With advancing age, the proteasome's efficiency in degrading damaged proteins diminishes, a phenomenon observed across various tissues.

Purpose of the Study:

  • To review the multifaceted roles of the proteasome in the aging process.
  • To examine the evidence linking proteasome function and dysfunction to age-related cellular changes and diseases.
  • To explore the potential connection between proteasome activity and longevity.

Main Methods:

  • Review of existing literature on proteasome function in aging.
  • Analysis of studies investigating proteasome activity in cultured cells.
  • Examination of data from model organisms and human studies on aging and proteasome function.

Main Results:

  • Age-related decline in proteasome catalytic activity and altered subunit expression are evident in muscle, skin, and brain tissues.
  • Reduced proteasome function contributes to the accumulation of damaged and misfolded proteins.
  • Impaired proteasome activity is implicated in age-related neurodegenerative diseases and the pathology of protein aggregate formation.

Conclusions:

  • Proteasome dysfunction is a significant factor in the aging process, contributing to cellular damage and disease.
  • Deficits in proteasome activity may underlie the accumulation of aberrant proteins, a hallmark of aging and neurodegeneration.
  • Evidence suggests a correlation between proteasome function and lifespan, highlighting its importance in longevity.