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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...

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...

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:

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...

Drug-Receptor Interactions

Drug-Receptor Interactions

Drug-receptor interaction describes the binding of receptors by drugs, but not all drug-receptor interactions result in activation and tissue response. For instance, the binding of agonists activates the receptor to generate a cellular reaction, while antagonists bind to receptors without causing their activation.
Several parameters, such as the drug's affinity for its receptor and its efficacy, which is its ability to activate the receptor, determine the drug's effect on the tissue.

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Related Experiment Video

Updated: Jul 8, 2026

Quantitative Structure-Activity Relationship, Activity Prediction, and Molecular Dynamics of Non-nucleotide Reverse Transcriptase Inhibitors

Quantitative Structure-Activity Relationship, Activity Prediction, and Molecular Dynamics of Non-nucleotide Reverse Transcriptase Inhibitors

Published on: May 9, 2025

Identifying receptor-ligand interactions through an ab initio approach.

Pablo F Salazar¹, Jorge M Seminario

¹Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843, USA.

The Journal of Physical Chemistry. B

|January 10, 2008

Summary

We found that stronger receptor-ligand binding affinity correlates with greater charge transfer. This discovery enables reliable analysis of complex binding interactions using minimal computational power.

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A BW Reporter System for Studying Receptor-Ligand Interactions

A BW Reporter System for Studying Receptor-Ligand Interactions

Published on: January 7, 2019

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Last Updated: Jul 8, 2026

Quantitative Structure-Activity Relationship, Activity Prediction, and Molecular Dynamics of Non-nucleotide Reverse Transcriptase Inhibitors

Quantitative Structure-Activity Relationship, Activity Prediction, and Molecular Dynamics of Non-nucleotide Reverse Transcriptase Inhibitors

Published on: May 9, 2025

A BW Reporter System for Studying Receptor-Ligand Interactions

A BW Reporter System for Studying Receptor-Ligand Interactions

Published on: January 7, 2019

Area of Science:

Computational chemistry
Molecular interactions
Biophysics

Background:

Understanding receptor-ligand interactions is crucial in drug discovery and molecular biology.
Accurate prediction of binding affinity often requires significant computational resources.
Electric characteristics offer a potential avenue for analyzing these interactions.

Purpose of the Study:

To establish a qualitative relationship between electric characteristics and binding affinity in complex receptor-ligand systems.
To explore the utility of charge transfer as an indicator of binding strength.
To develop a computationally inexpensive method for assessing binding interactions.

Main Methods:

Analysis of electric characteristics of receptor-ligand complexes.
Correlation studies between measured electric properties and binding affinity.
Computational modeling to investigate charge transfer phenomena.

Main Results:

A clear qualitative correlation was demonstrated between electric characteristics and binding affinity.
Higher binding affinity was found to correlate with increased charge transfer.
The findings suggest charge transfer is a reliable indicator of binding strength.

Conclusions:

Electric characteristics, specifically charge transfer, provide a reliable indicator of receptor-ligand binding affinity.
This provides a computationally efficient approach for analyzing complex binding interactions.
The method offers acceptable reliability for evaluating binding phenomena with reduced computational cost.