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Related Concept Videos

Protein Folding01:22

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Overview
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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. 
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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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Protein Denaturation01:28

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The function of proteins depends on their native three-dimensional structure, which is dictated by the amino acid sequence of the specific protein. Folding of the polypeptide chain takes place under specific conditions that energetically favor the folded conformation. In contrast, protein denaturation occurs spontaneously under unfavorable conditions that disrupt the integrity of the folded conformation. Thus, the chemical and physical environment of a protein, such as significant changes in pH...
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Protein and Protein Structure02:15

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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
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Protein Organization01:24

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Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
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Related Experiment Video

Updated: Sep 14, 2025

Extraction and Visualization of Protein Aggregates after Treatment of Escherichia coli with a Proteotoxic Stressor
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Extraction and Visualization of Protein Aggregates after Treatment of Escherichia coli with a Proteotoxic Stressor

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How does protein aggregate structure affect mechanisms of disaggregation?

YuChen Yang1, Hays S Rye1

  • 1Department of Biochemistry and Biophysics, Texas A&M University, College Station Texas, 77845, U.S.A.

Biochemical Society Transactions
|July 24, 2025
PubMed
Summary

Protein aggregates, like amyloid fibrils and amorphous clusters, resist cellular cleanup by molecular chaperones due to complex structures. Understanding these protein misfolding diseases requires innovative biophysical and computational methods.

Keywords:
amyloidmolecular chaperonesprotein aggregationprotein misfoldingproteostasis

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Structural Biology

Background:

  • Protein misfolding and aggregation are implicated in neurodegenerative diseases such as Alzheimer's, Parkinson's, and Huntington's.
  • Cellular proteostasis networks, involving molecular chaperones, manage protein folding and prevent aggregation.
  • Key knowledge gaps exist regarding the differential susceptibility of protein aggregates to chaperone-mediated disassembly.

Purpose of the Study:

  • To investigate the factors influencing the disaggregation of structurally diverse protein aggregates by molecular chaperones.
  • To elucidate the mechanistic basis for the varying efficacy of chaperone intervention in protein aggregation disorders.

Main Methods:

  • Categorization of protein aggregates into amyloid fibrils and amorphous clusters based on structural properties.
  • Analysis of aggregate characteristics, including size, internal structure, surface dynamics, and chaperone-binding site accessibility.
  • Integration of single-molecule biophysics, structural biology, and computational modeling approaches.

Main Results:

  • Amyloid fibrils exhibit ordered, cross-β-sheet structures and nucleation-driven growth.
  • Amorphous aggregates arise from heterogeneous interactions of partially unfolded proteins, lacking ordered structure but possessing specific assembly constraints.
  • Both amorphous and amyloid aggregation pathways can be interconnected, leading to co-occurrence of different aggregate types.

Conclusions:

  • Molecular chaperone efficacy in remodeling and disassembling protein aggregates is contingent upon aggregate characteristics.
  • The mechanistic complexity, heterogeneity, and dynamic nature of protein aggregates present significant challenges.
  • Innovative, multidisciplinary approaches are essential to understand protein aggregation and disaggregation dynamics in cellular contexts.