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Related Experiment Videos

Folding lambda-repressor at its speed limit.

Wei Yuan Yang1, Martin Gruebele

  • 1Center for Biophysics and Computational Biology, University of Illinois at Urbana-Champaign, 61801, USA.

Biophysical Journal
|July 9, 2004
PubMed
Summary
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Researchers engineered the lambda(6-85) protein to transition from activated to downhill folding by altering solvent conditions. This study reveals insights into protein folding dynamics and the speed limit of protein folding.

Area of Science:

  • Protein dynamics
  • Biophysics
  • Computational biology

Background:

  • Protein folding is crucial for biological function.
  • Understanding folding pathways, especially downhill folding, is key to protein engineering.
  • The lambda(6-85) five-helix bundle serves as a model system.

Purpose of the Study:

  • To engineer the lambda(6-85) protein to transition between activated and downhill folding.
  • To investigate the role of solvent conditions and free-energy surface bias in protein folding.
  • To characterize the speed limit of protein folding.

Main Methods:

  • Engineering the lambda(6-85) protein.
  • Solvent tuning using denaturants and stabilizing buffers (e.g., glucose).
  • Langevin dynamics simulations on a biased free-energy surface.

Related Experiment Videos

Main Results:

  • Demonstrated transition from activated to downhill folding by modifying solvent conditions.
  • Observed faster dynamics preceding activated kinetics and subsequent disappearance of activated kinetics.
  • Measured a folding speed limit of 1 microsecond for lambda(6-85) under specific conditions.
  • Estimated residual energetic frustration of lambda(6-85) at approximately 0.64 k(2)T(2).

Conclusions:

  • Protein folding can be tuned from activated to downhill pathways via solvent engineering.
  • Low energetic frustration and a low-dimensional free-energy surface are associated with faster folding rates.
  • The findings provide a quantitative description of folding transitions and inform protein design.