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Related Concept Videos

Ligand Binding Sites02:40

Ligand Binding Sites

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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
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Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
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The Equilibrium Binding Constant and Binding Strength02:18

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The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:
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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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Ligand-Binding-Site Structure Refinement Using Molecular Dynamics with Restraints Derived from Predicted Binding Site

Hugo Guterres1, Hui Sun Lee1, Wonpil Im1,2

  • 1Department of Biological Sciences , Lehigh University , Bethlehem , Pennsylvania 18015 , United States.

Journal of Chemical Theory and Computation
|September 27, 2019
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Summary

This study introduces a new method to refine protein ligand-binding site structures using molecular dynamics simulations. This approach significantly improves the accuracy of predicted binding sites for drug discovery.

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Area of Science:

  • Computational Biology
  • Structural Biology
  • Drug Discovery

Background:

  • Accurate modeling of ligand-binding sites is crucial for structure-based virtual screening.
  • Predicted protein models often have low-quality ligand-binding site structures requiring refinement.

Purpose of the Study:

  • To present a novel protocol for refining ligand-binding site structures.
  • To enhance the accuracy of protein models for virtual screening applications.

Main Methods:

  • Utilized molecular dynamics (MD) simulations.
  • Employed restraints derived from predicted binding site templates for refinement.
  • Validated the protocol on 40 diverse protein sets from the Astex list.

Main Results:

  • Achieved consistent refinement of ligand-binding sites on modeled protein structures.
  • Demonstrated an average Cα RMSD improvement of 0.90 Å for protein structures.
  • Showed an average RMSD improvement of 1.97 Å in ligand binding modes after refinement.

Conclusions:

  • The developed protocol offers a promising method for refining protein ligand-binding site structures.
  • Improved structure accuracy facilitates more reliable virtual screening and drug design.