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Related Concept Videos

Ligand Binding Sites02:40

Ligand Binding Sites

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...
Ligand Binding Sites02:40

Ligand Binding Sites

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...
Ligand Binding and Linkage00:49

Ligand Binding and Linkage

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 the...
Ligand Binding and Linkage00:49

Ligand Binding and Linkage

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 the...
The Equilibrium Binding Constant and Binding Strength02:18

The Equilibrium Binding Constant and Binding Strength

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:
G Protein-coupled Receptors01:15

G Protein-coupled Receptors

G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...

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Incorporating Target Protein Structure Flexibility and Dynamics in Computational Drug Discovery Using Ensemble-Based Docking Analysis
08:49

Incorporating Target Protein Structure Flexibility and Dynamics in Computational Drug Discovery Using Ensemble-Based Docking Analysis

Published on: June 20, 2025

FLIPDock: docking flexible ligands into flexible receptors.

Yong Zhao1, Michel F Sanner

  • 1Department of Molecular Biology, TPC26, The Scripps Research Institute, La Jolla, CA 92037-1000, USA.

Proteins
|May 25, 2007
PubMed
Summary

FLIPDock is a new software for flexible protein-ligand docking that models conformational changes. It significantly improves docking success rates by accounting for receptor flexibility, outperforming rigid-receptor methods.

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Incorporating Target Protein Structure Flexibility and Dynamics in Computational Drug Discovery Using Ensemble-Based Docking Analysis
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Area of Science:

  • Computational Biology
  • Structural Biology
  • Drug Discovery

Background:

  • Protein-ligand binding involves complex conformational changes, posing challenges for traditional automated docking methods that often assume rigid structures.
  • Accurately modeling these dynamic interactions is crucial for understanding biological processes and designing effective therapeutics.

Purpose of the Study:

  • To introduce FLIPDock, a novel software for automated flexible protein-ligand docking.
  • To address the limitations of rigid-receptor docking by incorporating receptor flexibility into the computational model.

Main Methods:

  • FLIPDock utilizes a novel Flexibility Tree (FT) data structure to encode conformational spaces of flexible ligands and macromolecules.
  • Receptor conformational flexibility is modeled by parameterizing conformational subspaces, which are searched using genetic algorithms.
  • A scoring function based on the AutoDock3.05 force field evaluates potential docking complexes.

Main Results:

  • FLIPDock demonstrated a 93.5% success rate in a cross-docking experiment, significantly higher than the 72% achieved by AutoDock, which assumes rigid receptors.
  • The software successfully docked balanol to a protein kinase A binding pocket, showcasing its ability to handle backbone motion in receptors.
  • FLIPDock effectively solves docking problems where receptor flexibility is critical for ligand binding.

Conclusions:

  • FLIPDock provides an effective solution for protein-ligand docking by accurately modeling conformational changes in both ligands and receptors.
  • The Flexibility Tree data structure and parameterization approach enable efficient exploration of conformational landscapes.
  • This advancement has significant implications for drug discovery and understanding molecular recognition in biological systems.