Related Experiment Video

Updated: Aug 25, 2026

Assays for the Degradation of Misfolded Proteins in Cells
10:56

Assays for the Degradation of Misfolded Proteins in Cells

Published on: August 28, 2016

Roles of molecular chaperones in protein misfolding diseases

José M Barral1, Sarah A Broadley, Gregor Schaffar

  • 1Department of Cellular Biochemistry, Max-Planck-Institut für Biochemie, Am Klopferspitz 18a, D-82152 Martinsried, Germany.

Seminars in Cell & Developmental Biology
|March 24, 2004
PubMed

Insights

Molecular chaperones are crucial in preventing human misfolding diseases. Enhancing chaperone activity may offer new therapeutic strategies for neurodegenerative conditions like amyloidosis.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Neuroscience

Background:

  • Human diseases arise from protein misfolding, either due to failed activation or aberrant accumulation.
  • Molecular chaperones play a role in protein folding and are implicated in misfolding diseases.
  • Rare syndromes are linked to compromised chaperone activity, while common neurodegenerative diseases involve toxic gain-of-function from misfolded proteins.

Purpose of the Study:

  • To elucidate the role of molecular chaperones in human misfolding diseases.
  • To understand the mechanisms by which chaperones influence disease development.
  • To explore potential therapeutic strategies targeting chaperone function.

Main Methods:

  • The study reviews existing literature on protein misfolding diseases and molecular chaperones.
  • It analyzes the impact of chaperone mutations and chaperone capacity imbalances.
  • It discusses the effects of increased chaperone expression on protein toxicity.

Main Results:

  • Misfolding diseases stem from protein misfolding, with chaperones influencing their development.
  • Mutations affecting chaperone activity cause rare genetic syndromes.
  • Common neurodegenerative diseases are driven by toxic gain-of-function from misfolded proteins, potentially due to overwhelmed chaperone systems.

Conclusions:

  • Toxicity in neurodegenerative diseases may result from an imbalance between chaperone capacity and misfolded protein production.
  • Increased chaperone expression can mitigate the neurotoxicity of misfolded proteins.
  • Targeting chaperone function presents a promising therapeutic avenue for misfolding diseases.

More Related Videos

Defining Hsp33's Redox-regulated Chaperone Activity and Mapping Conformational Changes on Hsp33 Using Hydrogen-deuterium Exchange Mass Spectrometry10:24

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

Published on: June 7, 2018

Quantifying Tissue-Specific Proteostatic Decline in Caenorhabditis elegans09:18

Quantifying Tissue-Specific Proteostatic Decline in Caenorhabditis elegans

Published on: September 7, 2021

Related Concept Videos

Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

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.
The...
Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

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.
The...
Bacterial Protein Maturation01:26

Bacterial Protein Maturation

Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...
Amyloid Fibrils03:03

Amyloid Fibrils

Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
Amyloid deposits were observed as early as 1639 in the liver and the spleen.   In 1854, Rudolph Virchow performed iodine staining, normally used to...
Amyloid Fibrils03:03

Amyloid Fibrils

Amyloid fibrils are aggregates of misfolded proteins.  Under most circumstances, misfolded proteins are either refolded by chaperone proteins or degraded by the proteasome. However, in the case of a mutation or a disease, these proteins can accumulate to form large clusters and often further assemble to form elongated fibers, called fibrils. 
Amyloid deposits were observed as early as 1639 in the liver and the spleen.   In 1854, Rudolph Virchow performed iodine staining, normally used to...
Export of Misfolded Proteins out of the ER01:32

Export of Misfolded Proteins out of the ER

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...