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Models of cooperativity in protein folding
H S Chan1, S Bromberg, K A Dill
1Department of Pharmaceutical Chemistry, University of California, San Francisco 94143-1204, USA.
Summary
The hydrophobic core collapse model best explains two-state protein folding cooperativity. This model, supported by experimental evidence, aligns with observed kinetics and predicted denatured states.
Area of Science:
- Protein folding dynamics
- Biophysical chemistry
- Molecular biology
Background:
- Understanding protein folding is crucial for molecular biology.
- Three models explain two-state cooperativity: helix-coil, sidechain packing, and hydrophobic core collapse.
- Previous models inadequately explain globular protein folding mechanisms.
Purpose of the Study:
- To evaluate the basis of two-state cooperativity in protein folding.
- To compare the predictive power of three major protein folding models.
Main Methods:
- Analysis of theoretical models for protein folding.
- Review of experimental data on protein folding kinetics and denatured states.
- Comparison of model predictions with experimental observations.
Main Results:
- Helix-coil theory lacks two-state behavior and fails for sheet proteins.
- Sidechain packing model does not accurately predict two-state behavior or molten globule states.
- Hydrophobic core collapse model demonstrates two-state behavior in simulations and aligns with experimental kinetics and denatured states.
Conclusions:
- The hydrophobic core collapse model provides the most compelling explanation for two-state protein folding cooperativity.
- Experimental evidence supports the hydrophobic core collapse model's predictions regarding hydrophobic cluster formation and secondary structure development.
- This model accurately predicts the characteristics of compact denatured states in protein folding.