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Downhill protein folding: evolution meets physics.

Martin Gruebele1

  • 1Department of Chemistry, University of Illinois, Urbana, IL 61801, USA. gruebele@scs.uiuc.edu

Comptes Rendus Biologies
|August 30, 2005
PubMed
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Scientists redesigned proteins to fold downhill, confirming energy-landscape models. However, natural proteins retain folding barriers, potentially for preventing aggregation and enabling function.

Area of Science:

  • Biochemistry
  • Protein Folding Dynamics
  • Computational Biology

Background:

  • The energy-landscape model predicts proteins can be engineered to fold downhill.
  • Natural proteins, however, exhibit activation barriers during folding.
  • Understanding these barriers is crucial for protein science.

Purpose of the Study:

  • To investigate the role of activation barriers in natural protein folding.
  • To explore the evolutionary pressures that might maintain these barriers.
  • To reconcile experimental observations with energy-landscape predictions.

Main Methods:

  • Protein redesign and engineering experiments.
  • Spectroscopic techniques for monitoring folding intermediates.
  • Kinetic analyses to quantify folding rates and barriers.

Related Experiment Videos

Main Results:

  • Redesigned proteins were successfully engineered to fold downhill on simplified energy landscapes.
  • Experimental evidence confirmed the presence of small but significant activation barriers in natural proteins.
  • Spectroscopy and kinetics identified potential functional and anti-aggregation roles for these barriers.

Conclusions:

  • Protein folding can be simplified to downhill processes, validating energy-landscape theories.
  • Natural proteins possess folding barriers shaped by evolutionary selection for function and against aggregation.
  • Activation barriers are not merely byproducts but integral features of functional protein dynamics.