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Related Experiment Videos

Diffusional barrier crossing in a two-state protein folding reaction.

M Jacob1, M Geeves, G Holtermann

  • 1Laboratorium für Biochemie, Universität Bayreuth, D-95440 Bayreuth, Germany.

Nature Structural Biology
|October 3, 1999
PubMed
Summary

Protein folding dynamics, specifically for cold shock protein CspB, are influenced by solvent viscosity. This suggests Kramers

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Area of Science:

  • Biochemistry
  • Physical Chemistry
  • Molecular Biology

Background:

  • The role of solvent viscosity in protein folding kinetics remains debated.
  • Viscogenic agents complicate folding studies by altering both viscosity and protein stability.
  • Understanding folding mechanisms requires disentangling these confounding factors.

Purpose of the Study:

  • To investigate the direct impact of solvent viscosity on protein folding dynamics.
  • To determine if protein folding rates are dependent on solvent viscosity.
  • To clarify the theoretical framework applicable to viscosity-dependent folding.

Main Methods:

  • Utilized cold shock protein B (CspB) for folding studies.
  • Employed carefully controlled experimental conditions to isolate viscosity effects.

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  • Manipulated solvent viscosity while maintaining constant protein stability.

    • Main Results:

    • Demonstrated that the folding dynamics of CspB are indeed dependent on solvent viscosity.
    • Showcased that the influence of viscosity on folding rates can be measured independently of stability changes.
    • Provided empirical evidence supporting a viscosity-dependent folding mechanism.

    Conclusions:

    • Protein folding, as exemplified by CspB, can be directly influenced by solvent viscosity.
    • Kramers' theory of reaction rates provides a more appropriate model than transition state theory for this folding reaction.
    • Future studies on protein folding kinetics in varying solvent environments should consider Kramers' theory.