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Related Experiment Videos

Side-chain conformational entropy in protein folding

A J Doig1, M J Sternberg

  • 1Department of Biochemistry and Applied Molecular Biology, University of Manchester Institute of Science and Technology, United Kingdom. andrew.doig@umist.ac.uk

Protein Science : a Publication of the Protein Society
|November 1, 1995
PubMed
Summary

Protein folding involves significant side-chain entropy loss, impacting protein structure and function. This conformational entropy change is a key thermodynamic factor, estimated at 1 kcal/mol per side chain.

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Area of Science:

  • Thermodynamics
  • Structural Biology
  • Biophysics

Background:

  • Protein folding thermodynamics is crucial for understanding protein structure and function.
  • The contribution of side-chain conformational entropy to protein folding is often underestimated.
  • Understanding entropy changes is key to predicting protein behavior and interactions.

Purpose of the Study:

  • To quantify the loss of side-chain conformational entropy during protein folding.
  • To assess the thermodynamic significance of side-chain rotamer restriction in native protein structures.
  • To explore the implications of side-chain entropy for protein structure and function.

Main Methods:

  • Comparing the number of accessible side-chain rotamers in unfolded versus folded protein states.

Related Experiment Videos

  • Estimating fusion entropies to determine conformational entropy changes.
  • Analyzing vibrational entropy contributions to folding thermodynamics.

    • Main Results:

    • The mean conformational free energy change (T delta S) due to side-chain restriction is approximately 1 kcal/mol per side chain or 0.5 kcal/mol per bond.
    • Vibrational entropy changes are found to be negligible compared to side-chain conformational entropy loss.
    • Side-chain entropy significantly influences protein structure and interactions.

    Conclusions:

    • Side-chain conformational entropy loss is a major thermodynamic factor in protein folding.
    • This entropy loss helps explain alpha-helix propensities and side-chain distribution in proteins.
    • Quantifying side-chain entropy is valuable for predicting protein-inhibitor complex structures and protein surface/interior organization.