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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...

Solvating Effects

Solvating Effects

An understanding of the solvating effect helps rationalize the relation between solvation and acidity of the compound. In addition, this also explains the relative stability of conjugate bases for compounds with different pKa values. This lesson details, in-depth, the principle of solvating effects. The strength of an acid and the stability of its corresponding conjugate base are determined using pKa values. This observed relationship is a consequence of solvation, which is the interaction...

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...

Leveling Effect

Leveling Effect

In acid-base chemistry, the leveling effect refers to the limitation imposed by the solvent on the strength of acids and bases in solution. When a base stronger than the solvent's conjugate base is used, it deprotonates the solvent until the base is entirely consumed, making it ineffective against weaker acids. Conversely, an acid stronger than the solvent's conjugate acid protonates the solvent until the acid is depleted, rendering it ineffective against weaker bases. Essentially, 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...

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: Mar 8, 2026

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

Published on: January 16, 2016

Solvent effects on ligand binding to a serine protease.

Srinivasa M Gopal¹, Fabian Klumpers², Christian Herrmann²

¹Center for Theoretical Chemistry, Faculty of Chemistry and Biochemistry, Ruhr-University Bochum, D-44780 Bochum, Germany. lars.schaefer@ruhr-uni-bochum.de.

Physical Chemistry Chemical Physics : PCCP

|January 25, 2017

Summary

Understanding protein-ligand binding thermodynamics is crucial. This study used isothermal titration calorimetry (ITC) and molecular dynamics (MD) simulations to reveal how solvent changes affect binding, highlighting the role of conformational flexibility.

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Area of Science:

Biochemistry
Computational Chemistry
Biophysics

Background:

Solvation significantly impacts biomolecular recognition and binding.
Understanding how solvent composition influences binding thermodynamics is challenging.

Purpose of the Study:

To investigate the effect of solvent composition on protein-ligand binding thermodynamics.
To combine experimental and computational methods for atomic-level insights.

Main Methods:

Isothermal titration calorimetry (ITC) for thermodynamic measurements.
Molecular dynamics (MD) and free energy simulations for atomic-level analysis.
Studied p-aminobenzamidine (PAB) binding to trypsin in water/methanol mixtures.

Main Results:

Binding free energy showed modest changes with methanol concentration, driven by enthalpy-entropy compensation.
Increased methanol favored binding enthalpy via stronger protein-ligand and intramolecular interactions.
Ligand desolvation entropy became less favorable in methanol mixtures, impacting overall binding free energy.

Conclusions:

Conformational flexibility, even in small motions, significantly influences binding energetics.
Combined ITC/MD approach provides detailed thermodynamic contributions from distinct conformational states.
Enhanced understanding of biomolecular binding processes is achieved by considering solvent effects and flexibility.