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Ligand Binding Sites

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 Sites

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 Linkage

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 Linkage

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...

Conserved Binding Sites

Conserved Binding Sites

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.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally analyses the...

The Equilibrium Binding Constant and Binding Strength

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:

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Related Experiment Video

Updated: Jul 8, 2026

Structure-Guided Design and Development of Novel Cyclophilin A Inhibitors and Ganoderiol-F Derivatives: An In-Silico Approach

Structure-Guided Design and Development of Novel Cyclophilin A Inhibitors and Ganoderiol-F Derivatives: An In-Silico Approach

Published on: June 23, 2026

Ligand-protein docking with water molecules.

Benjamin C Roberts¹, Ricardo L Mancera

¹School of Pharmacy, Curtin University of Technology, GPO Box U1987, Perth WA 6845, Australia.

Journal of Chemical Information and Modeling

|January 24, 2008

Summary

Including water molecules in ligand-protein docking simulations significantly improves prediction accuracy. This enhancement is consistent regardless of how water molecule orientation is optimized, confirming their crucial role in drug discovery.

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

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

Published on: June 20, 2025

Area of Science:

Computational chemistry
Structural biology
Drug discovery

Background:

Ligand-protein interactions are central to molecular biology and drug design.
Accurate prediction of binding modes is crucial for identifying potential drug candidates.
The role of water molecules in binding site interactions is often overlooked in docking simulations.

Purpose of the Study:

To investigate the impact of water molecules on ligand-protein docking accuracy.
To evaluate the effect of water molecule orientation optimization on docking performance.
To determine if pre-optimizing water orientation without a ligand affects docking accuracy.

Main Methods:

Performed comprehensive docking simulations on a dataset of ligand-protein complexes.
Included only water molecules in close proximity to both ligand and protein.
Assessed docking accuracy with and without water molecules, and with different water optimization strategies.

Main Results:

A statistically significant increase in docking prediction accuracy was observed when water molecules were included.
The accuracy improvement was independent of the water molecule orientation optimization method used.
Pre-optimizing water molecule orientation in the absence of a ligand did not negatively impact docking accuracy.

Conclusions:

Water molecules are essential for accurate ligand-protein docking predictions.
Including water molecules in docking simulations is recommended whenever possible.
Pre-optimization of water orientation, even without a ligand, is a viable strategy for enhancing docking accuracy in drug discovery.