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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

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...

Ligand Binding and Linkage

Ligand Binding and Linkage

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:

The Equilibrium Binding Constant and Binding Strength

The Equilibrium Binding Constant and Binding Strength

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Related Experiment Video

Updated: Feb 3, 2026

Author Spotlight: Exploring Cellular Processes by Modeling Ligands in Cryo-EM Maps

Author Spotlight: Exploring Cellular Processes by Modeling Ligands in Cryo-EM Maps

Published on: July 19, 2024

Mapping the Ligand Binding Landscape.

¹Department of Biochemistry & Molecular Biology, Michigan State University, East Lansing, Michigan; Department of Computational Mathematics, Science and Engineering, Michigan State University, East Lansing, Michigan.

Biophysical Journal

|October 18, 2018

Summary

This summary is machine-generated.

Mapping protein-ligand binding landscapes is challenging. WExplore simulations reveal that ligands often transition through unbound states, suggesting a trial-and-error binding mechanism crucial for drug discovery.

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Last Updated: Feb 3, 2026

Author Spotlight: Exploring Cellular Processes by Modeling Ligands in Cryo-EM Maps

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Mapping the Binding Site of an Aptamer on ATP Using MicroScale Thermophoresis

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Published on: January 2, 2018

Area of Science:

Computational chemistry
Biophysics
Drug discovery

Background:

Protein-ligand interactions involve complex conformational searches.
Simulating ligand binding and release is limited by timescale challenges.
Enhanced sampling methods are needed to explore free-energy landscapes.

Purpose of the Study:

To map ligand binding landscapes using the WExplore enhanced sampling method.
To study bromodomain-inhibitor systems (Brd4-MS436 and Baz2B-ICR7).
To analyze ligand binding pathways and identify stable poses.

Main Methods:

Utilized the WExplore enhanced sampling method for broad free-energy landscape exploration.
Employed Markov state models (MSMs) with time-lagged independent component analysis.
Analyzed unbiased trajectory segments from multiple simulations.

Main Results:

WExplore successfully mapped binding landscapes and identified pathways.
Exit rates from simulations agreed with crystal structures for both systems.
Ligand binding transitions predominantly occur via the unbound state (81% average).

Conclusions:

Ligand binding likely follows a trial-and-error mechanism.
WExplore and MSMs provide valuable tools for visualizing binding landscapes.
Findings have implications for kinetics-based drug discovery and virtual screening.