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Related Experiment Videos

How does a protein fold?

A Sali1, E Shakhnovich, M Karplus

  • 1Department of Chemistry, Harvard University, Cambridge, Massachusetts 02138.

Nature
|May 19, 1994
PubMed
Summary
This summary is machine-generated.

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The Levinthal paradox is resolved by proteins rapidly collapsing into semi-compact states, enabling efficient searching for the native state. This mechanism ensures thermodynamic stability and guides protein folding pathways.

Area of Science:

  • Computational biology
  • Biophysics
  • Protein folding dynamics

Background:

  • Polypeptide chains can adopt a vast number of conformations, posing a challenge for protein folding.
  • The Levinthal paradox describes the discrepancy between the theoretical time required to explore all conformations and the rapid, seconds-long folding observed in reality.

Purpose of the Study:

  • To investigate the resolution of the Levinthal paradox using a computational model.
  • To identify the key factors enabling rapid and specific protein folding.

Main Methods:

  • Utilized a lattice Monte Carlo model with a known global minimum representing the native state.
  • Simulated protein chain folding from random-coil to native states.

Main Results:

Related Experiment Videos

  • The native state must be a pronounced global minimum on the potential energy surface for stable folding.
  • Folding initiates with rapid collapse to a semi-compact globule, followed by a slower search.
  • Reduced conformational search space in semi-compact states and numerous transition states facilitate rapid folding.

Conclusions:

  • The resolution of the Levinthal paradox relies on a two-stage folding process: rapid collapse and efficient search.
  • Findings suggest principles applicable to real protein folding and have evolutionary implications.