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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:

Affinity and Avidity

Affinity and Avidity

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Related Experiment Video

Updated: Jan 25, 2026

Resolving Affinity Purified Protein Complexes by Blue Native PAGE and Protein Correlation Profiling

Resolving Affinity Purified Protein Complexes by Blue Native PAGE and Protein Correlation Profiling

Published on: April 1, 2017

Beyond Binding Affinity: Detailed Profiling of Protein-Ligand Interactions with Time-Resolved FRET.

Huan Liu^1,2,3, Fei Yang^1,2, Wenjing Li^1,2

¹Key Laboratory of Marine Drug, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China.

Analytical Chemistry

|January 23, 2026

Summary

This summary is machine-generated.

A new time-resolved Förster resonance energy transfer (TR-FRET) platform offers detailed insights into E3 ligase ligand interactions. This method aids in designing novel ligands for targeted protein degradation therapies.

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Area of Science:

Biochemistry
Chemical Biology
Structural Biology

Background:

Characterizing E3 ligase ligands is crucial for developing targeted protein degradation therapies.
Conventional affinity assays provide limited insights into the dynamics of protein-ligand interactions.
Understanding binary interactions is key for rational drug design and expanding proteolysis-targeting chimeras.

Purpose of the Study:

To develop a novel time-resolved Förster resonance energy transfer (TR-FRET) platform for multiparameter profiling of protein-ligand interactions.
To investigate interactions between E3 ligases and their ligands, including novel targets like CDC20.
To provide a practical tool for medicinal chemists to guide ligand optimization.

Main Methods:

Development of a TR-FRET platform for multiparameter analysis of protein-ligand binding.
Application of the platform to model systems (HaloTag, VHL) and the E3 ligase CDC20 with its ligand Apcin.
Analysis of photoluminescence decay data using multiexponential fitting to extract binding parameters.

Main Results:

The TR-FRET platform provides detailed insights into binding site occupancy, FRET subpopulations, efficiencies, and distances.
Key parameters reveal alterations in binding geometry and molecular orientation.
Heatmap visualization offers an intuitive representation of complex binding data.

Conclusions:

The developed TR-FRET platform enables deeper understanding of E3 ligase-ligand interactions beyond conventional methods.
This technology serves as a practical and expandable tool for medicinal chemists in ligand optimization.
The findings facilitate the rational design of novel E3 ligase ligands and the advancement of targeted protein degradation strategies.