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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

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...

Conserved Binding Sites

Conserved 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...

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: Apr 28, 2026

Modeling an Enzyme Active Site using Molecular Visualization Freeware

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Published on: December 25, 2021

Deciphering Zinc Binding Groups through Systematic Modeling and Cheminformatic Analysis.

Guoli Xiong¹, Zhiyan Xiao^1,2

¹Beijing Key Laboratory of Active Substance Discovery and Druggability Evaluation, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China.

Journal of Chemical Information and Modeling

|April 26, 2026

Summary

Researchers developed a new library of zinc-binding groups (ZBGs) to aid in discovering drugs targeting zinc metalloenzymes (Zn-MEs). This expands options for developing novel therapeutics by overcoming limitations in current ZBG diversity.

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Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry

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Published on: June 8, 2022

Area of Science:

Medicinal Chemistry
Computational Chemistry
Drug Discovery

Background:

Zinc metalloenzymes (Zn-MEs) are therapeutically significant targets.
Current drug discovery for Zn-MEs is limited by the structural diversity of zinc-binding groups (ZBGs).

Purpose of the Study:

To identify novel zinc-binding groups (ZBGs) for targeting zinc metalloenzymes (Zn-MEs).
To develop a ZBG library to facilitate Zn-ME inhibitor discovery and optimization.

Main Methods:

Systematic modeling and cheminformatic analysis of known Zn-ME inhibitors.
Application of twelve binary classifiers to distinguish Zn-ME inhibitors.
Utilizing interpretable machine learning and substructure detection to define ZBGs.
Creation of a ZBG library with 41 SMARTS patterns.

Main Results:

A novel ZBG library containing 41 SMARTS patterns was generated.
The library demonstrated effectiveness in enriching potential Zn-ME inhibitors.
The library aided in optimizing drug-likeness and modulating subtype selectivity.

Conclusions:

The developed ZBG library expands the toolkit for discovering novel Zn-ME inhibitors.
This approach addresses the challenge of limited ZBG diversity in drug discovery.
The findings are expected to accelerate the development of new therapeutics targeting Zn-MEs.