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Modeling an Enzyme Active Site using Molecular Visualization Freeware
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WATsite: hydration site prediction program with PyMOL interface.

Bingjie Hu1, Markus A Lill

  • 1Department of Medicinal Chemistry and Molecular Pharmacology, College of Pharmacy, Purdue University, 575 Stadium Mall Drive, West Lafayette, Indiana, 47906.

Journal of Computational Chemistry
|April 23, 2014
PubMed
Summary
This summary is machine-generated.

WATsite analyzes water molecule contributions to protein-ligand binding thermodynamics. This tool quantifies hydration site energies, aiding in understanding binding free energy contributions.

Keywords:
PyMOLWATsitegraphical user interfacehydration site

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Area of Science:

  • Computational Chemistry
  • Structural Biology
  • Biophysics

Background:

  • Water molecules play a crucial role in protein-ligand interactions, influencing binding thermodynamics through enthalpy and entropy.
  • Understanding the energetic contributions of individual water molecules is essential for accurate prediction of ligand binding affinity.

Purpose of the Study:

  • To develop and present WATsite, a novel program for detailed hydration site analysis.
  • To elucidate the thermodynamic profiles of water molecules in protein binding sites.
  • To enable estimation of protein desolvation free energy for ligands.

Main Methods:

  • Utilized molecular dynamics (MD) simulations with explicit water molecules to identify hydration sites.
  • Developed WATsite, a program with a graphical user interface (GUI) integrated with PyMOL.
  • Calculated enthalpy and entropy for water molecules within identified hydration sites to estimate free energy profiles.

Main Results:

  • WATsite successfully identifies hydration sites from MD trajectories.
  • The program provides estimations of hydration site free energy, including enthalpic and entropic contributions.
  • A key feature allows for the estimation of protein desolvation free energy for user-defined ligands.

Conclusions:

  • WATsite offers a user-friendly method for analyzing the thermodynamic impact of water molecules on ligand binding.
  • The tool facilitates a deeper understanding of hydration effects in protein-ligand complexation.
  • WATsite is freely available, promoting its use in computational drug design and biophysical studies.