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Amyloid Fibrils

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,...

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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
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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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Assays for the Degradation of Misfolded Proteins in Cells

Assays for the Degradation of Misfolded Proteins in Cells

Published on: August 28, 2016

Protein Misfolding Diseases.

F Ulrich Hartl¹

¹Department of Cellular Biochemistry, Max Planck Institute of Biochemistry, 82152 Martinsried, Germany;

Annual Review of Biochemistry

|April 26, 2017

Summary

This summary is machine-generated.

Misfolded proteins form toxic aggregates linked to neurodegenerative diseases like Alzheimer's. Cellular defense systems decline with age, increasing disease risk, but cells can sequester these toxic aggregates.

Keywords:

amyloid molecular chaperone neurodegenerative disease protein aggregation protein folding protein homeostasis protein misfolding proteostasis

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Area of Science:

Biochemistry
Neuroscience
Cell Biology

Background:

Proteins require specific 3D structures for function, but can misfold into toxic aggregates.
Misfolded protein aggregates, including amyloid deposits, are implicated in neurodegenerative diseases.

Discussion:

Cellular protein homeostasis (proteostasis) networks, including molecular chaperones, combat protein aggregation.
These defense mechanisms weaken with aging, promoting aggregate-related pathologies.

Key Insights:

Understanding the structures of pathological protein aggregates is crucial for disease mechanism insights.
Cells possess strategies to neutralize toxic aggregates by sequestering them.

Outlook:

Further research into aggregate structures and cellular defense mechanisms can inform therapeutic strategies.
Targeting proteostasis networks may offer new avenues for treating age-related neurodegenerative diseases.