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Related Experiment Videos

Protein folding--what's the question?

E E Lattman1, G D Rose

  • 1Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD 21205.

Proceedings of the National Academy of Sciences of the United States of America
|January 15, 1993
PubMed
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Protein folding often follows two-state kinetics. Even with destabilizing mutations, native-like protein structures can persist, suggesting conformation depends on specificity, not just energy.

Area of Science:

  • Protein folding dynamics
  • Biophysics
  • Molecular biology

Background:

  • Many small, globular proteins exhibit two-state folding kinetics, characterized by direct interconversion between folded and unfolded states without intermediates.
  • The free energy difference (ΔG) between native and denatured protein states is typically small, ranging from -5 to -15 kcal/mol.

Purpose of the Study:

  • To investigate the relationship between protein energy, conformation, and mutations.
  • To challenge the notion that thermodynamic stability solely dictates protein structure.

Main Methods:

  • Theoretical analysis of protein folding kinetics.
  • Examination of free energy differences (ΔG) in protein systems.

Main Results:

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  • A persistent population of native-like protein molecules can exist even with mutations that significantly destabilize the protein (changing the sign of ΔG).
  • This indicates that protein conformation is not solely determined by free energy (energy per se).

Conclusions:

  • Protein conformation is influenced by factors beyond thermodynamic stability.
  • Future protein folding studies should prioritize specificity over stability for greater insight.