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Related Concept Videos

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. 
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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.
The...
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4D Imaging of Protein Aggregation in Live Cells
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Published on: April 5, 2013

Protein aggregation in crowded environments.

Duncan A White1, Alexander K Buell, Tuomas P J Knowles

  • 1Department of Chemistry, University of Cambridge, Cambridge, UK.

Journal of the American Chemical Society
|March 26, 2010
PubMed
Summary
This summary is machine-generated.

Physicochemical properties of biomolecules influence protein aggregation, a key factor in diseases like Alzheimer's. This study quantifies amyloid fibril growth kinetics, revealing links between protein structure, environment, and aggregation propensity.

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Area of Science:

  • Biochemistry
  • Biophysics
  • Molecular Biology

Background:

  • Physicochemical parameters of biomolecules are crucial for biological processes.
  • Protein self-association into amyloid fibrils is linked to diseases like Alzheimer's and Type II diabetes.

Purpose of the Study:

  • To quantitatively measure the kinetics of amyloid fibril growth in various crowded environments.
  • To establish general relationships between protein aggregation propensities and their structural/environmental parameters.

Main Methods:

  • Quantitative quartz crystal microbalance measurements.
  • Kinetic analysis of amyloid fibril growth.
  • Theoretical predictions and modeling.

Main Results:

  • Demonstrated general relationships linking protein aggregation propensities to fundamental structural and environmental parameters.
  • Quantified the kinetics of amyloid fibril growth under different crowding conditions.

Conclusions:

  • Protein aggregation is fundamentally linked to molecular structure and local environment.
  • Understanding these relationships can provide insights into disease mechanisms and potential therapeutic targets.