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Related Concept Videos

Necrosis01:16

Necrosis

Necrosis is considered as an “accidental” or unexpected form of cell death that ends in cell lysis. The first noticeable mention of “necrosis” was in 1859 when Rudolf Virchow used this term to describe advanced tissue breakdown in his compilation titled “Cell Pathology”.
Morphological Manifestations of Necrosis
Necrotic cells show different types of morphological appearance depending on the type of tissue and infection. In coagulative necrosis, cells become anucleated and die, but their...
The Proteasome01:13

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 Proteasome02:18

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...
Radical Autoxidation01:20

Radical Autoxidation

The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
Peroxisomes01:24

Peroxisomes

Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
Oxidation of Phenols to Quinones01:17

Oxidation of Phenols to Quinones

In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...

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Related Experiment Video

Updated: Jun 1, 2026

Evaluation of the Impact of Protein Aggregation on Cellular Oxidative Stress in Yeast
11:04

Evaluation of the Impact of Protein Aggregation on Cellular Oxidative Stress in Yeast

Published on: June 23, 2018

Commentary: proteooxidotoxic process of aggregation.

Mark P Mattson1

  • 1Laboratory of Neurosciences, National Institute on Aging Intramural Research Program, Baltimore, MD 21224, USA. mattsonm@grc.nia.nih.gov

Neuromolecular Medicine
|May 20, 2011
PubMed
Summary
This summary is machine-generated.

Neurodegenerative diseases involve protein aggregates, but toxicity may stem from reactive oxygen species (ROS). This proteooxidotoxicity mechanism explains protein aggregation and neuronal damage, not just aggregate structure.

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Last Updated: Jun 1, 2026

Evaluation of the Impact of Protein Aggregation on Cellular Oxidative Stress in Yeast
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Evaluation of the Impact of Protein Aggregation on Cellular Oxidative Stress in Yeast

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Extraction and Visualization of Protein Aggregates after Treatment of Escherichia coli with a Proteotoxic Stressor
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Extraction and Visualization of Protein Aggregates after Treatment of Escherichia coli with a Proteotoxic Stressor

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Defining Hsp33's Redox-regulated Chaperone Activity and Mapping Conformational Changes on Hsp33 Using Hydrogen-deuterium Exchange Mass Spectrometry
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Area of Science:

  • Neuroscience
  • Biochemistry
  • Pathology

Background:

  • Neurodegenerative disorders are often characterized by protein aggregates like amyloid-beta (Aβ) and alpha-synuclein.
  • Current research emphasizes the structural state of these aggregates in disease pathogenesis.
  • The prevailing assumption links neurotoxicity directly to the tertiary structure of protein aggregates.

Discussion:

  • This work challenges the direct link between protein aggregate structure and neurotoxicity.
  • Evidence suggests that reactive oxygen species (ROS) are the primary drivers of neuronal damage.
  • A novel 'proteooxidotoxicity' mechanism is proposed, where ROS induce both protein aggregation and cell death.

Key Insights:

  • Neurotoxicity in neurodegenerative diseases may not depend on specific protein aggregate structures.
  • Reactive oxygen species (ROS) are implicated as the key mediators of neuronal damage.
  • The proteooxidotoxicity model offers a unifying explanation for various observations in the field.

Outlook:

  • Further research should focus on ROS-scavenging strategies for neurodegenerative diseases.
  • Investigating the chemical reactions generating ROS could reveal new therapeutic targets.
  • This paradigm shift may resolve the difficulty in identifying specific protein aggregate receptors.