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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...

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:

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...

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Related Experiment Video

Updated: May 11, 2026

Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web

Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web

Published on: July 16, 2017

MoMA-LigPath: a web server to simulate protein-ligand unbinding.

Didier Devaurs¹, Léa Bouard, Marc Vaisset

¹CNRS, LAAS, 7 av du colonel Roche, F-31400 Toulouse, France.

Nucleic Acids Research

|May 15, 2013

Summary

Understanding protein-ligand interactions is key for drug discovery. MoMA-LigPath simulates ligand unbinding pathways, offering insights into these crucial molecular interactions efficiently.

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Area of Science:

Computational Biology
Molecular Modeling
Biophysics

Background:

Allosteric protein-ligand interactions, occurring away from the active site, significantly influence molecular specificity and activity.
Experimental and computational methods currently face challenges in characterizing these distant interactions.
Understanding these interactions is vital for drug design and development.

Purpose of the Study:

To introduce MoMA-LigPath, a novel computational tool for simulating ligand unbinding pathways.
To provide an efficient method for exploring protein-ligand interactions beyond the active site.
To offer a preliminary analysis of ligand unbinding that can be further refined.

Main Methods:

MoMA-LigPath employs a mechanistic representation of molecular systems with partial flexibility.
A robotics-inspired algorithm is utilized to efficiently explore conformational space.
The approach is purely geometric, enabling rapid simulation of ligand unbinding.

Main Results:

The tool successfully generates ligand unbinding pathways.
The geometric approach allows for short computing times, making simulations feasible.
The generated pathways serve as a valuable first approximation of protein-ligand interactions.

Conclusions:

MoMA-LigPath offers an efficient computational method for studying distant protein-ligand interactions.
The tool provides initial insights into ligand unbinding mechanisms.
Further refinement with advanced energy models and molecular modeling is possible for detailed analysis.