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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...

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:

Protein-protein Interfaces

Protein-protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...

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...

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Related Experiment Video

Updated: Jul 11, 2026

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

ParDOCK: an all atom energy based Monte Carlo docking protocol for protein-ligand complexes.

A Gupta¹, A Gandhimathi, P Sharma

¹Department of Chemistry & Supercomputing Facility for Bioinformatics & Computational Biology, Indian Institute of Technology, Hauz Khas, New Delhi-110016, India.

Protein and Peptide Letters

|September 28, 2007

Summary

This study introduces an all-atom Monte Carlo docking method for protein-ligand complexes. The validated procedure accurately predicts complex structures and binding energies, offering a valuable computational tool.

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Area of Science:

Computational chemistry
Structural biology
Drug discovery

Background:

Accurate prediction of protein-ligand complex structures is crucial for understanding biological interactions and designing new drugs.
Existing molecular docking methods often face challenges in achieving high accuracy and reliability.

Purpose of the Study:

To develop and validate an all-atom energy-based Monte Carlo docking procedure for protein-ligand complexes.
To assess the accuracy of the docking protocol in predicting native complex conformations and binding affinities.

Main Methods:

An all-atom energy-based Monte Carlo simulation approach was employed for molecular docking.
The procedure was tested on a diverse dataset comprising 226 protein-ligand complexes.
Root Mean Square Deviation (RMSD) and correlation coefficients (r²) were used for validation.

Main Results:

The docking procedure achieved an average RMSD of approximately 0.53 Å compared to crystal conformations.
A correlation coefficient (r²) of 0.72 was observed between predicted binding free energies and experimental binding affinities.
The developed docking protocol is accessible as a free web-enabled software.

Conclusions:

The all-atom Monte Carlo docking method demonstrates high accuracy in predicting protein-ligand complex structures.
The protocol shows significant potential for reliable prediction of binding affinities, aiding in drug discovery efforts.
The web-enabled availability of the software facilitates its use in research and development.