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Related Concept Videos

Translocation of Proteins into the Mitochondria01:19

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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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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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Alzheimer's Disease: Overview01:26

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Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
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Export of Misfolded Proteins out of the ER01:32

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After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
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Mitochondrial Precursor Proteins01:39

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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
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Mitochondrial Protein Sorting01:39

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Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death.  Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
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Molecular Chaperones and Protein Folding03:00

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The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
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Related Experiment Video

Updated: Sep 11, 2025

Quantitative Analysis of Mitochondria-Associated Endoplasmic Reticulum Membrane (MAM) Stabilization in a Neural Model of Alzheimer's Disease (AD)
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Quantitative Analysis of Mitochondria-Associated Endoplasmic Reticulum Membrane (MAM) Stabilization in a Neural Model of Alzheimer's Disease (AD)

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Chaperone-Mediated Responses and Mitochondrial-Endoplasmic Reticulum Coupling: Emerging Insight into Alzheimer's

Manish Kumar Singh1,2, Minghao Fu1,3, Sunhee Han1,2,3

  • 1Department of Biochemistry and Molecular Biology, School of Medicine, Kyung Hee University, Seoul 02447, Republic of Korea.

Cells
|August 13, 2025
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Summary

Alzheimer's disease involves proteostasis and organelle communication disruptions. Targeting stress chaperones and mitochondria-ER interactions offers new therapeutic strategies for neurodegeneration.

Keywords:
Alzheimer’s diseaseaggregatesamyloid-βcalciumchaperonesendoplasmic reticulummitochondria

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Alzheimer's disease (AD) is a leading cause of dementia, affecting millions globally with significant care costs.
  • AD pathogenesis involves complex interactions including proteostasis disruption, oxidative stress, and impaired organelle communication.
  • Early AD diagnosis is challenging due to subtle, gradual symptom onset.

Purpose of the Study:

  • To review the intricate relationship between stress chaperone responses and organelle function in Alzheimer's disease.
  • To explore the specific role of mitochondria-endoplasmic reticulum (ER) interactions in neurodegeneration.
  • To identify promising therapeutic targets for AD and related disorders.

Main Methods:

  • Literature review focusing on molecular mechanisms of AD.
  • Analysis of the interplay between oxidative stress, unfolded protein response (UPR), and proteostasis.
  • Examination of mitochondrial and ER calcium homeostasis in neurodegenerative processes.

Main Results:

  • Elevated reactive oxygen species (ROS) and misfolded protein accumulation are early hallmarks of neurodegeneration.
  • Amyloid-β plaques and tau tangles contribute to neuroinflammation and exacerbate oxidative stress.
  • Mitochondrial and ER dysfunction are central to AD pathology.

Conclusions:

  • Targeting stress-related signaling pathways, including mitochondrial and ER oxidative stress, is a promising therapeutic avenue.
  • Understanding stress chaperone roles and organelle crosstalk is crucial for developing novel AD treatments.
  • Interventions focused on restoring proteostasis and organelle communication may mitigate neurodegeneration.