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Related Concept Videos

Protein Folding01:22

Protein Folding

Overview
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
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 Denaturation01:28

Protein Denaturation

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...
Protein and Protein Structure02:15

Protein and Protein Structure

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.
A protein's shape is critical to its function. For example, an enzyme can...

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Related Experiment Video

Updated: Jul 7, 2026

Study of Protein Dynamics via Neutron Spin Echo Spectroscopy
08:03

Study of Protein Dynamics via Neutron Spin Echo Spectroscopy

Published on: April 13, 2022

Protein unfolding behavior studied by elastic network model.

Ji Guo Su1, Chun Hua Li, Rui Hao

  • 1College of Life Science and Bioengineering, Beijing University of Technology, Beijing, China.

Biophysical Journal
|March 4, 2008
PubMed
Summary
This summary is machine-generated.

This study introduces an iterative normal mode calculation method to simulate protein unfolding, revealing the crucial role of native topology. The method accurately predicts unfolding sequences and shows denatured states exhibit cooperative motions.

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Study of Protein Dynamics via Neutron Spin Echo Spectroscopy
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Thermodynamics of Membrane Protein Folding Measured by Fluorescence Spectroscopy
10:09

Thermodynamics of Membrane Protein Folding Measured by Fluorescence Spectroscopy

Published on: April 28, 2011

Area of Science:

  • Protein dynamics and biophysics
  • Computational biology
  • Structural bioinformatics

Background:

  • Protein native-state topology contains vital information for folding/unfolding.
  • Gaussian Network Model (GNM) predicts fluctuations but is limited by its linear description for complex folding landscapes.

Purpose of the Study:

  • Develop a novel method to study protein unfolding properties.
  • Explore the role of native topology in protein unfolding.
  • Address the limitations of linear models in describing non-linear conformational changes.

Main Methods:

  • Proposed an iterative normal mode calculation method to capture non-linear conformational changes.
  • Simulated protein unfolding by sequentially breaking native contacts based on residue distance fluctuations.
  • Applied the method to two proteins: CI2 and barnase.

Main Results:

  • The simulated unfolding sequence aligns with experimental and simulation data (MD, MC).
  • The native topology appears to be a critical factor in the unfolding process.
  • Unfolding pathways demonstrated robustness against stochastic noise.

Conclusions:

  • The developed iterative method is effective for studying protein unfolding.
  • Denatured states exhibit cooperative motions, not random coil behavior.
  • Cooperative motions in denatured states may facilitate efficient and accurate refolding.