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Elusive affinities

J Janin1

  • 1Laboratoire de Biologie Structurale, UMR 9920 CNRS-Université Paris-Sud, Gif-sur-Yvette, France.

Proteins
|January 1, 1995
PubMed
Summary
This summary is machine-generated.

Calculating molecular binding thermodynamics is challenging. While dissociation heat capacity shows promise, enthalpy and entropy estimates have large errors, limiting reliable predictions for protein-protein and protein-DNA interactions.

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Area of Science:

  • Biophysics
  • Computational Chemistry
  • Molecular Dynamics

Background:

  • Molecular interactions, such as protein-protein and protein-DNA association, are governed by thermodynamic parameters like enthalpy, free enthalpy, entropy, and heat capacity.
  • Understanding these parameters is crucial for predicting binding affinity and temperature dependence.

Purpose of the Study:

  • To evaluate the feasibility of deriving thermodynamic parameters for molecular dissociation using computational methods.
  • To assess the accuracy of these derived parameters compared to experimental data.

Main Methods:

  • Molecular mechanics calculations in the gas phase.
  • Inclusion of hydration parameters calibrated on small molecules for solution-phase calculations.
  • Rigid body approximation for associating components.

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Main Results:

  • Gas-phase enthalpy and entropy estimates exhibit large error bars, even with the rigid body approximation, yielding unreliable results.
  • Poor agreement was found between calculated and experimental values for enthalpy and entropy changes.
  • Dissociation heat capacity showed a better fit to experimental data and correlated with the interface size.

Conclusions:

  • Computational derivation of enthalpy and entropy changes for molecular dissociation is currently unreliable.
  • Dissociation heat capacity is a more robust parameter, largely influenced by hydration and interface size.
  • The rigid body approximation is more applicable to protein-protein complexes than protein-DNA complexes due to differences in interface size and conformational flexibility.