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Related Concept Videos

Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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...
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Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
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.
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Related Experiment Video

Updated: Jun 13, 2026

Microfluidic Mixers for Studying Protein Folding
12:42

Microfluidic Mixers for Studying Protein Folding

Published on: April 10, 2012

Coordinate and time-dependent diffusion dynamics in protein folding.

Ronaldo J Oliveira1, Paul C Whitford, Jorge Chahine

  • 1Departamento de Física - Instituto de Biociências, Letras e Ciências Exatas, Universidade Estadual Paulista, São José do Rio Preto 15054-000, Brazil.

Methods (San Diego, Calif.)
|May 5, 2010
PubMed
Summary
This summary is machine-generated.

Diffusion dynamics in protein folding are influenced by time and coordinate-dependent factors. These dynamics impact folding kinetics, leading to non-exponential rates and challenging classical transition state theory.

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Last Updated: Jun 13, 2026

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Area of Science:

  • Biophysics
  • Computational Biology
  • Chemical Kinetics

Background:

  • Protein folding is a complex process governed by diffusion dynamics within energy landscapes.
  • Understanding these dynamics is crucial for elucidating folding pathways and kinetics.
  • Existing models often simplify diffusion, potentially overlooking key mechanistic details.

Purpose of the Study:

  • To investigate the impact of time- and coordinate-dependent diffusion on protein folding kinetics.
  • To develop analytical and simulation methods for exploring these complex diffusion dynamics.
  • To assess the implications for transition state theory and single-molecule studies.

Main Methods:

  • Developed analytical models based on a generalized Fokker-Planck diffusion equation.
  • Employed structure-based folding models for simulations.
  • Studied the fast-folding protein CspTm using single-molecule experiments.

Main Results:

  • Diffusion acts as a quantitative measure of escape from local traps in the protein folding funnel.
  • Time-dependent diffusion leads to non-exponential folding kinetics and non-Poisson statistics.
  • Coordinate-dependent diffusion alters kinetic barrier heights, transition state positions, and folding routes.

Conclusions:

  • Time- and coordinate-dependent diffusion are critical for accurately modeling protein folding, especially in fast-folding systems.
  • These findings necessitate modifications to classical transition state theory.
  • Single-molecule experiments can probe local landscapes and barrier distributions by analyzing complex kinetics.