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Related Experiment Videos

Heat capacity in proteins.

Ninad V Prabhu1, Kim A Sharp

  • 1E.R. Johnson Research Foundation, Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6059, USA. nprabhu@mail.med.upenn.edu

Annual Review of Physical Chemistry
|March 31, 2005
PubMed
Summary
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Heat capacity (Cp) in proteins offers deep thermodynamic insights. Understanding its contributions from hydration and protein interactions is key to explaining protein stability and folding behaviors.

Area of Science:

  • Biophysics
  • Thermodynamics
  • Protein Science

Background:

  • Heat capacity (Cp) is a crucial thermodynamic quantity for proteins, yet challenging to interpret physically.
  • Observed Cp changes reveal insights into solvation, entropy, enthalpy, and protein stability, including phenomena like cold denaturation.
  • Two primary contributions to Cp exist: hydration and protein-protein interactions, with their relative importance in folding and binding remaining an open question.

Purpose of the Study:

  • To elucidate the physical meaning and implications of heat capacity (Cp) in proteins.
  • To explore the contributions of hydration and protein interactions to protein heat capacity.
  • To provide a theoretical framework for understanding Cp-related phenomena in protein thermodynamics.

Main Methods:

Related Experiment Videos

  • Review and synthesis of theoretical work on protein heat capacity.
  • Analysis of hydration contributions to Cp.
  • Examination of Cp's role in protein stability and temperature-dependent behavior.

Main Results:

  • Theoretical models can semiquantitatively explain major Cp features, including hydration effects for apolar and polar groups.
  • Hydration of apolar groups shows positive Cp, while polar groups exhibit negative Cp.
  • Apolar group hydration entropy converges around 112°C, and apolar hydration Cp decreases with increasing temperature.

Conclusions:

  • Heat capacity provides rich thermodynamic insights into protein behavior, distinguishing solvation types and influencing stability.
  • Theoretical understanding of hydration contributions to Cp is advancing, explaining key experimental observations.
  • Further research is needed to clarify the dominant role of hydration versus protein-protein interactions in folding and binding.