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Thermodynamic integration to predict host-guest binding affinities.

Morgan Lawrenz1, Jeff Wereszczynski, Juan Manuel Ortiz-Sánchez

  • 1Department of Chemistry and Biochemistry, Center for Theoretical Biological Physics, University of California, San Diego, La Jolla, CA, USA. mlawrenz@ucsd.edu

Journal of Computer-Aided Molecular Design
|February 22, 2012
PubMed
Summary
This summary is machine-generated.

Alchemical free energy methods accurately predicted host-guest binding free energies for cucurbit-[n]uril systems. A periodicity correction improved accuracy, highlighting challenges in simulating charged systems with unconfirmed docking poses.

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Area of Science:

  • Computational Chemistry
  • Molecular Modeling
  • Supramolecular Chemistry

Background:

  • Accurate prediction of host-guest binding free energies is crucial for designing novel molecular recognition systems.
  • Alchemical free energy calculations offer a powerful, yet computationally intensive, approach to quantify these interactions.

Purpose of the Study:

  • To evaluate the performance of alchemical free energy methods in a blind prediction contest (SAMPL3).
  • To calculate binding free energies for seven guests complexed with an acyclic cucurbit-[n]uril host.
  • To identify sources of error and assess the impact of corrections on simulation accuracy.

Main Methods:

  • Explicit solvent molecular dynamics simulations were employed.
  • Alchemical free energy calculations utilized thermodynamic integration.
  • Protonation states and docking poses were determined for host and guest molecules.

Main Results:

  • A root mean square error (RMSE) of 3.6 kcal mol(-1) was observed against experimental data (R(2) = 0.51).
  • A periodicity-induced free energy correction improved agreement for a key guest by 1.7 kcal mol(-1).
  • Overall RMSE was reduced by 0.4 kcal mol(-1) after applying corrections.

Conclusions:

  • Charged host-guest systems, especially when initialized with uncertain docking poses, pose significant challenges for alchemical simulation accuracy.
  • The study demonstrates the potential of alchemical methods while underscoring the need for careful system setup and error analysis.
  • Further refinement of simulation protocols is necessary for reliable predictions in complex supramolecular systems.