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Related Experiment Videos

Entropy-enthalpy compensation: fact or artifact?

K Sharp1

  • 1Johnson Research Foundation, Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, PA 19104, USA. sharpk@mail.med.upenn.edu

Protein Science : a Publication of the Protein Society
|May 10, 2001
PubMed
Summary
This summary is machine-generated.

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Entropy-enthalpy (S-H) compensation in biological systems may not reveal extra-thermodynamic information. Observed linear S-H compensation is likely a common statistical behavior, insensitive to specific system details.

Area of Science:

  • Thermodynamics
  • Statistical Mechanics
  • Biophysics

Background:

  • Entropy-enthalpy (S-H) compensation is frequently used to explain thermodynamic data for biomolecules like proteins, ligands, and nucleic acids.
  • It's hypothesized to be an intrinsic property of complex, fluctuating, or aqueous systems.

Purpose of the Study:

  • To investigate if observed S-H compensation is extra-thermodynamic or merely a statistical artifact.
  • To determine what, if any, causal information S-H compensation reveals about complex biological systems.

Main Methods:

  • Analysis of recent thermodynamic data on proteins.
  • Development and analysis of a general statistical mechanical model for complex systems.

Main Results:

Related Experiment Videos

  • Recent protein data suggesting compensation was better explained by other factors.
  • The statistical mechanical model predicts linear S-H compensation over limited perturbations.
  • The compensation temperature (Tc) is typically within 20% of the experimental temperature and insensitive to model specifics.

Conclusions:

  • Observed S-H compensation in complex systems is likely a general statistical behavior, not revealing specific extra-thermodynamic or causal information.
  • Distinguishing this statistical compensation from other forms in experimental data may be challenging.