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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

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

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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...

Cooperative Allosteric Transitions

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...

Cooperative Allosteric Transitions

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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.
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Related Experiment Video

Updated: Jun 1, 2026

A Nanobar-Supported Lipid Bilayer System for the Study of Membrane Curvature Sensing Proteins in vitro

A Nanobar-Supported Lipid Bilayer System for the Study of Membrane Curvature Sensing Proteins in vitro

Published on: November 30, 2022

Exploring the binding dynamics of BAR proteins.

Doron Kabaso¹, Ekaterina Gongadze, Jernej Jorgačevski

¹Laboratory of Physics, Faculty of Electrical Engineering, University of Ljubljana, Tržaška 25, SI-1000, Ljubljana, Slovenia. doron.kabaso@fe.uni-lj.si

Cellular & Molecular Biology Letters

|May 27, 2011

Summary

This summary is machine-generated.

BAR domain proteins bind lipid bilayers by utilizing negative binding energy and lipid shape coupling to drive membrane bending. This interaction is crucial for membrane curvature and lipid aggregation, with implications for exovesicle fusion.

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Last Updated: Jun 1, 2026

A Nanobar-Supported Lipid Bilayer System for the Study of Membrane Curvature Sensing Proteins in vitro

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Area of Science:

Membrane biophysics
Protein-lipid interactions
Computational modeling

Background:

BAR domain proteins are crucial for membrane remodeling.
Lipid bilayers exhibit intrinsic curvature properties.
Charged lipids interact with BAR domains, influencing membrane shape.

Purpose of the Study:

Investigate the binding dynamics of lipid bilayers to BAR domains.
Determine the role of binding energy and lipid curvature in membrane bending.
Explore the influence of BAR protein shape (positive/negative intrinsic curvature) on lipid bilayer interaction.

Main Methods:

Continuum model based on Helfrich free energy.
Calculation of electric potential using the Langevin-Bikerman equation.
Numerical simulations of BAR domain-lipid bilayer interactions.

Main Results:

Negative binding energy is essential for initial membrane instability and bending.
Coupling between lipid intrinsic curvature and membrane curvature drives lipid aggregation.
BAR domain shape influences lipid binding and membrane remodeling.

Conclusions:

BAR domain binding energy and lipid shape coupling are key drivers of membrane bending.
These interactions are critical for curvature-dependent lipid aggregation.
Suggests novel experimental approaches (patch clamp) to study BAR protein dynamics and their role in exovesicle fusion pore stability.