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Diffusion control in an elementary protein folding reaction

M Jacob1, T Schindler, J Balbach

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

Proceedings of the National Academy of Sciences of the United States of America
|May 27, 1997
PubMed
Summary
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The fast folding of cold-shock protein CspB is diffusion-controlled, suggesting protein chain compaction is key. An energetic barrier is essential for stabilizing native protein structures against unfolding.

Area of Science:

  • Biochemistry
  • Protein dynamics
  • Biophysics

Background:

  • Cold-shock proteins like CspB are crucial for cellular adaptation to cold.
  • CspB exhibits rapid, reversible two-state folding (native ⇌ unfolded).
  • Understanding protein folding mechanisms is fundamental in molecular biology.

Purpose of the Study:

  • To investigate the folding kinetics of Bacillus subtilis CspB.
  • To elucidate the role of solvent viscosity and diffusion in protein folding.
  • To explore the relationship between energetic barriers and protein structural stability.

Main Methods:

  • Studied CspB folding and unfolding kinetics.
  • Varied solvent viscosity using ethylene glycol and sucrose.
  • Applied Kramers' model to analyze reaction rates.

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Main Results:

  • Increased solvent viscosity significantly decelerated both CspB unfolding and refolding.
  • Folding kinetics align with Kramers' model, indicating diffusion-controlled steps.
  • Protein chain compaction identified as the rate-limiting step in folding.
  • Coupling of chain diffusion and energy barrier crossing determines reaction rate.

Conclusions:

  • CspB folding is governed by solvent diffusion and energy barrier crossing.
  • An energetic barrier is vital for maintaining protein native state stability.
  • This barrier protects against unfolding driven by random chain motions.
  • The study supports apparent two-state behavior in protein folding.