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Related Experiment Video

Updated: Apr 2, 2026

Microfluidic Mixers for Studying Protein Folding

Microfluidic Mixers for Studying Protein Folding

Published on: April 10, 2012

Folding at the speed limit.

Wei Yuan Yang¹, Martin Gruebele

¹Center for Biophysics and Computational Biology, University of Illinois, Urbana Illinois 61801, USA.

|May 9, 2003

Summary

This summary is machine-generated.

Protein folding speed limits were explored using rapidly folding mutants. The study reveals a molecular timescale, crucial for understanding protein folding dynamics and setting ultimate folding speed limits.

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Area of Science:

Biophysics
Chemical Kinetics
Protein Dynamics

Background:

Conventional models assume rapid equilibrium in protein folding kinetics.
These models may not apply when molecular timescales are significant.
The molecular timescale governs the ultimate speed of protein folding.

Purpose of the Study:

To directly probe the molecular timescale in protein folding.
To investigate the folding dynamics of rapidly folding protein mutants.
To determine the ultimate speed limit of protein folding.

Main Methods:

Studied rapidly folding mutants of the lambda(6-85) five-helix bundle protein.
Measured time-dependent rate coefficients during protein folding.
Utilized transition-state theory and chemical kinetics principles.

Main Results:

Identified a time-dependent rate coefficient below 2 microseconds.
This coefficient signals the onset of the molecular timescale.
The molecular timescale was found to be a significant factor in folding dynamics.

Conclusions:

The molecular timescale is experimentally accessible and dictates folding speed limits.
A simple model confirms the molecular timescale as a natural pre-factor in transition-state models.
Findings refine our understanding of protein folding kinetics and dynamics.