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Intermediates can accelerate protein folding.

C Wagner1, T Kiefhaber

  • 1Biozentrum der Universität Basel, Abteilung Biophysikalische Chemie, Klingelbergstrasse 70, CH-4056 Basel, Switzerland.

Proceedings of the National Academy of Sciences of the United States of America
|June 9, 1999
PubMed
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Intermediates in protein folding can accelerate the process if they create small energy barriers, enhancing folding rates through entropy. Optimized barriers include partially folded intermediates.

Area of Science:

  • Biophysics
  • Chemical Kinetics
  • Protein Dynamics

Background:

  • Protein folding is crucial for biological function.
  • Understanding the kinetics of protein folding is a key challenge.
  • Intermediates can influence folding pathways and rates.

Purpose of the Study:

  • To investigate the impact of intermediates on protein folding rates.
  • To explore the role of energy barriers and entropic contributions.
  • To determine optimal transition barrier characteristics for efficient folding.

Main Methods:

  • Application of Kramers' theory for diffusive barrier crossing.
  • Modeling intermediates as local minima in the transition barrier.
  • Analysis in the high friction limit.

Related Experiment Videos

Main Results:

  • Very large or small intermediate barriers slow down folding.
  • Barriers >1 kBT that do not change overall height increase folding rates.
  • Rate enhancement is linked to favorable entropic contributions.
  • The effect increases with the number of intermediates up to a limit.

Conclusions:

  • Optimized protein folding transition barriers should incorporate partially folded, high-energy intermediates.
  • Strategic intermediate placement can significantly enhance folding efficiency.
  • Entropy plays a critical role in modulating folding rates via intermediates.