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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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Homeostatic Imbalance01:10

Homeostatic Imbalance

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Homeostasis is the maintenance of a stable internal environment within the body, which is crucial for the proper functioning of cells, tissues, organs, and organ systems. The body has various control mechanisms that work together to regulate various physiological parameters such as temperature, blood pressure, pH balance, and fluid balance, to name a few. These control mechanisms are based on feedback loops that can be either positive or negative.
However, sometimes these feedback loops fail,...
21.9K
Regulation of the Unfolded Protein Response01:31

Regulation of the Unfolded Protein Response

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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...
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Regulated Protein Degradation02:58

Regulated Protein Degradation

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pH Regulation in Cells01:28

pH Regulation in Cells

6.0K
pH plays a critical role in maintaining normal cellular activities. It helps maintain the structure and function of various proteins, dictates the charge on cellular membranes, and is crucial for metabolic reactions inside the cell. Moreover, cells use the energy from the proton motive force to generate ATP.
Cytosolic pH
Under physiological conditions, the cytosolic pH is slightly more acidic than the extracellular pH. However, cells must prevent further acidification of their cytosol to...
6.0K
Overview of Protein Metabolism01:21

Overview of Protein Metabolism

779
Proteins are broken down into amino acids during digestion. Unlike fats and carbohydrates, which are stored for later use, proteins are not. Instead, amino acids are either used to produce ATP through oxidation or contribute to the creation of new proteins for the growth and repair of the body. Any surplus amino acids from the diet are converted into glucose or triglycerides rather than excreted.
Amino acids play various roles in the body once they are absorbed into cells. They are restructured...
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Related Experiment Video

Updated: Jun 10, 2025

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

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Proteostasis and Its Role in Disease Development.

Manisha Shukla1, Mahesh Narayan2

  • 1Department of Biotechnology, Pandit S.N. Shukla University, Shahdol, Madhya Pradesh, India.

Cell Biochemistry and Biophysics
|October 18, 2024
PubMed
Summary
This summary is machine-generated.

Proteostasis, the regulation of protein balance, is vital for cellular health. Disruptions in protein homeostasis are linked to diseases like cancer and neurological disorders.

Keywords:
DiseasesHeat shock proteinMisfolded proteinProtein degradation pathwayProteostasis

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Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Biochemistry

Background:

  • Proteostasis (protein homeostasis) governs protein synthesis, folding, trafficking, and degradation.
  • Proper protein conformation and function are essential for cellular integrity and health.
  • Dysregulation of proteostasis is implicated in various diseases, including cancer and neurodegenerative disorders.

Purpose of the Study:

  • To review the fundamental mechanisms of proteostasis.
  • To explore the link between proteostasis disruption and disease pathogenesis.
  • To highlight the therapeutic potential of targeting proteostasis pathways.

Main Methods:

  • Literature review of proteostasis mechanisms, including molecular chaperones and degradation pathways (ubiquitin-proteasome system, autophagy-lysosome pathway).
  • Analysis of cellular quality control and stress response pathways (heat shock, unfolded protein response).
  • Examination of the role of proteostasis deregulation in various pathologies.

Main Results:

  • Proteostasis involves intricate quality control systems to maintain protein integrity.
  • Stress responses enhance protein folding and degradation capacities.
  • Imbalances in proteostasis contribute significantly to disease development.

Conclusions:

  • Proteostasis is critical for maintaining cellular homeostasis and preventing protein aggregation.
  • Understanding proteostasis mechanisms offers avenues for novel therapeutic strategies.
  • Targeting proteostasis pathways is crucial for treating a range of debilitating diseases.