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Related Experiment Videos

How much is a stabilizing bond worth?

K A Sharp1, S W Englander

  • 1Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia 19104-6059.

Trends in Biochemical Sciences
|December 1, 1994
PubMed
Summary
This summary is machine-generated.

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The stability contribution of noncovalent bonds in protein and nucleic acid folding differs from their intrinsic stability. These bonds significantly impact molecular stability through altered free energy, enthalpy, entropy, and heat capacity increments.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Protein and nucleic acid stability are crucial for biological function.
  • Noncovalent bonds are key to the folding and stability of biomolecules.
  • Current understanding may oversimplify the energetic contribution of individual bonds.

Purpose of the Study:

  • To re-evaluate the contribution of noncovalent bonds to biomolecular stability.
  • To investigate the thermodynamic parameters of bonding interactions in molecular folding.
  • To challenge the assumption that in situ bond stability equals its contribution to overall stability.

Main Methods:

  • Thermodynamic analysis of noncovalent interactions.
  • Computational modeling of molecular folding.

Related Experiment Videos

  • Analysis of free energy, enthalpy, entropy, and heat capacity changes.

    • Main Results:

    • The contribution of noncovalent bonds to stability is not equal to their intrinsic stability.
    • Bonding interactions yield larger free energy increments than expected.
    • Enthalpy increments are smaller, while entropy and heat capacity increments are more positive.

    Conclusions:

    • The energetic contribution of noncovalent bonds to protein and nucleic acid stability is complex.
    • Standard assumptions about bond contribution to stability require revision.
    • Accurate modeling of biomolecular stability necessitates considering these altered thermodynamic parameters.