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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...
Protein Folding01:25

Protein Folding

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.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
Protein Folding01:22

Protein Folding

Overview
Protein Folding01:22

Protein Folding

Overview
Cooperative Binding of Transcription Regulators02:13

Cooperative Binding of Transcription Regulators

Transcriptional regulators bind to specific cis-regulatory sequences in the DNA to regulate gene transcription. These cis-regulatory sequences are very short, usually less than ten nucleotide pairs in length. The short length means that there is a high probability of the exact same sequence randomly occurring throughout the genome.  Since regulators can also bind to groups of similar sequences, this further increases the chances of random binding. Transcriptional regulators form dimers that...

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Do chaperonins boost protein yields by accelerating folding or preventing aggregation?

Biophysical journal·2008
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Free energy landscapes for amyloidogenic tetrapeptides dimerization.

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Accelerated folding in the weak hydrophobic environment of a chaperonin cavity: creation of an alternate fast folding pathway.

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Improved theoretical description of protein folding kinetics from rotations in the phase space of relevant order parameters.

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Related Experiment Video

Updated: Jul 19, 2026

Studies of Chaperone-Cochaperone Interactions using Homogenous Bead-Based Assay
06:51

Studies of Chaperone-Cochaperone Interactions using Homogenous Bead-Based Assay

Published on: July 21, 2021

Folding on the chaperone: yield enhancement through loose binding.

A I Jewett1, J-E Shea

  • 1Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA 93106, USA.

Journal of Molecular Biology
|September 22, 2006
PubMed
Summary

Small, ATP-independent chaperones enhance protein folding by preventing aggregation. These cageless molecules bind loosely, reducing misfolded protein states and accelerating folding rates for improved yields.

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Last Updated: Jul 19, 2026

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In Situ Monitoring of Transiently Formed Molecular Chaperone Assemblies in Bacteria, Yeast, and Human Cells
08:58

In Situ Monitoring of Transiently Formed Molecular Chaperone Assemblies in Bacteria, Yeast, and Human Cells

Published on: September 2, 2019

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Protein Dynamics

Background:

  • Small cageless chaperones, including mini-chaperones and artificial chaperones like alpha-casein, assist protein folding without ATP.
  • These molecules feature exposed hydrophobic patches for recognition of misfolded proteins.
  • Unlike complex chaperonins, their simpler structure offers insights into minimal chaperone functional requirements.

Purpose of the Study:

  • To investigate, using molecular dynamics simulations, how cageless chaperones aid substrate protein folding.
  • To model a cageless chaperone as a sphere with tunable hydrophobicity.

Main Methods:

  • Molecular dynamics simulations.
  • Modeling of a tunable hydrophobicity sphere as a cageless chaperone.
  • Analysis of substrate protein interactions and folding pathways.

Main Results:

  • Cageless chaperones increase folding yields under steady-state conditions.
  • They reduce the time substrate proteins spend in aggregation-prone states.
  • This occurs by competing for hydrophobic sites and accelerating folding rates.
  • Effective binding is loose, allowing protein conformational changes while bound.

Conclusions:

  • Small cageless chaperones can enhance protein folding and prevent aggregation under non-stress conditions.
  • Loose binding is crucial for facilitating folding and avoiding aggregation.
  • These chaperones are effective even at low concentrations and without ATP consumption.