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Related Concept Videos

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...
Regulated Protein Degradation02:58

Regulated Protein Degradation

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...
Regulated Protein Degradation02:58

Regulated Protein Degradation

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...
Regulation of the Unfolded Protein Response01:31

Regulation of the Unfolded Protein Response

Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
The Unfolded Protein Response01:37

The Unfolded Protein Response

The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...

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Related Experiment Video

Updated: May 8, 2026

Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism
12:38

Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism

Published on: December 18, 2013

Questioning photostasis.

Alexander Cunea1, Rana Begum, Dieter Reinisch

  • 1Institute of Ophthalmology, University College London, UK.

Visual Neuroscience
|August 30, 2013
PubMed
Summary
This summary is machine-generated.

Mammalian photostasis, the adaptation of photoreceptor outer segments (OS) to light, shows limited OS length plasticity. This study found no significant OS length changes in mice after 21 days of darkness, questioning established photostasis theories.

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Quantifying Tissue-Specific Proteostatic Decline in Caenorhabditis elegans
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Quantifying Tissue-Specific Proteostatic Decline in Caenorhabditis elegans

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Related Experiment Videos

Last Updated: May 8, 2026

Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism
12:38

Using Caenorhabditis elegans as a Model System to Study Protein Homeostasis in a Multicellular Organism

Published on: December 18, 2013

Quantifying Tissue-Specific Proteostatic Decline in Caenorhabditis elegans
09:18

Quantifying Tissue-Specific Proteostatic Decline in Caenorhabditis elegans

Published on: September 7, 2021

Area of Science:

  • Ophthalmology
  • Cell Biology
  • Animal Models

Background:

  • Photostasis describes outer segment (OS) and rhodopsin content adaptation to light.
  • Extended darkness is thought to increase OS length for enhanced photon capture.
  • Previous studies lacked statistical power and used albinos, confounding results.

Purpose of the Study:

  • To investigate the plasticity of photoreceptor outer segment length in response to prolonged darkness.
  • To determine if mammalian photostasis significantly alters OS length.
  • To assess OS length changes in both pigmented and albino mice.

Main Methods:

  • Pigmented and albino mice were housed in darkness for 21 days.
  • Outer segment lengths were measured and compared to control mice in a 12:12 light/dark cycle.
  • Approximately 1300 outer segments were analyzed across experimental groups.

Main Results:

  • No statistically significant difference in OS length was observed between light- and dark-reared mice.
  • A slight, non-significant trend towards longer OS in the dark was noted.
  • Results were consistent across both pigmented and albino mouse models.

Conclusions:

  • The study challenges the concept of significant OS length plasticity in mammalian photostasis.
  • Limited sample sizes and lack of statistical analysis in prior research may have overestimated photostasis effects.
  • Significant OS length adaptation to darkness appears minimal in mice.