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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...

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...

Complexation Equilibria: The Chelate Effect

Complexation Equilibria: The Chelate Effect

In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...

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...

Metal-Ligand Bonds

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...

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Related Experiment Video

Updated: Jun 4, 2025

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

Leveraging Cryptic Ligand Envelopes through Enhanced Molecular Simulations.

Francesco Colizzi^1,2

¹Molecular Ocean Lab, Institute for Advanced Chemistry of Catalonia, IQAC-CSIC, Carrer de Jordi Girona 18-26, 08034 Barcelona, Spain.

The Journal of Physical Chemistry Letters

|December 31, 2024

Summary

We developed a new simulation framework to visualize and characterize the hidden conformational states of protein-bound drugs. This approach reveals drug-target interactions and aids in designing more effective medicines.

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Area of Science:

Computational chemistry and molecular modeling.
Structural biology and drug discovery.

Background:

Protein-bound ligands exist in various conformations, forming a ligand envelope critical for drug design.
The dynamic and cryptic nature of this ligand envelope hinders its visualization and exploitation in drug discovery.

Purpose of the Study:

To present a general computational framework for reconstructing the dynamically accessible ligand envelope of protein-bound small molecules.
To quantify hidden conformational heterogeneity in complex ligands and reveal their thermodynamic and kinetic properties.

Main Methods:

Utilizing enhanced molecular dynamics simulations to model ligand conformational ensembles.
Applying the framework to structurally complex ligands, including plitidepsin.

Main Results:

Successfully reconstructed the cryptic ligand envelope, expanding the observed small-molecule footprint.
Quantified conformational heterogeneity and identified key thermodynamic and kinetic properties of ligand-target interactions.
Demonstrated quantitative agreement with experimental data from solution NMR, X-ray crystallography, and biochemical assays.

Conclusions:

The developed framework offers a versatile strategy for integrating receptor-bound ligand conformational ensembles into molecular design.
This approach enhances the understanding and design of potent and selective drugs by characterizing hidden ligand dynamics.