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Diffusion-collision model for the folding kinetics of myoglobin
D Bashford1, F E Cohen, M Karplus
1Department of Physics, Tufts University, Medford, Massachusetts 02155.
Proteins
|January 1, 1988
Summary
The diffusion-collision model reveals how myoglobin folds by analyzing helix interactions. Different folding pathways emerge when comparing folding to the native state versus the midpoint of the folding transition.
Area of Science:
- Protein folding dynamics
- Biophysical chemistry
- Computational biology
Background:
- Understanding protein folding is crucial for molecular biology.
- Myoglobin folding serves as a model system for protein dynamics.
Purpose of the Study:
- To analyze myoglobin folding kinetics using the diffusion-collision model.
- To identify microdomains and stabilizing contacts in myoglobin structure.
Main Methods:
- Application of the diffusion-collision model.
- Identification of microdomains as helices.
- Determination of inter-helix stabilizing contacts from native structure.
- Investigation of association and dissociation reactions.
- Analysis of various stabilization parameters.
Main Results:
- The diffusion-collision model successfully analyzed myoglobin folding.
- Helices were identified as key microdomains.
- Stabilizing contacts between helices were mapped.
- Significant differences in intermediate contributions were observed between folding to the native state and to the folding midpoint.
Conclusions:
- The diffusion-collision model provides insights into myoglobin folding pathways.
- Intermediates play distinct roles depending on the folding endpoint.
- Stabilization parameters influence the overall folding rate and intermediate contributions.