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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...

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:

Complexometric Titration: Ligands

Complexometric Titration: Ligands

Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...

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Updated: May 24, 2026

Single-molecule Manipulation of G-quadruplexes by Magnetic Tweezers

Single-molecule Manipulation of G-quadruplexes by Magnetic Tweezers

Published on: September 19, 2017

Experimental methods for studying the interactions between G-quadruplex structures and ligands.

Joaquim Jaumot¹, Raimundo Gargallo

¹Department of Analytical Chemistry, University of Barcelona, Barcelona, Spain. joaquimjaumot@ub.edu

Current Pharmaceutical Design

|March 2, 2012

Summary

This summary is machine-generated.

This review covers experimental methods for studying G-quadruplex-ligand interactions. It details spectroscopic and complementary techniques, aiding pharmaceutical development of G-quadruplex targeting agents.

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Area of Science:

Biochemistry and Biophysics
Chemical Biology
Molecular Biology

Background:

G-quadruplex structures are key targets in drug discovery, particularly for cancer therapy.
Understanding G-quadruplex-ligand interactions is crucial for developing effective pharmaceuticals.
Various experimental techniques are employed to characterize these interactions.

Purpose of the Study:

To review recent advances in experimental techniques for studying G-quadruplex-ligand interactions.
To discuss the applications and information yielded by spectroscopic and complementary methods.
To classify techniques based on ligand family and G-quadruplex sequence type.

Main Methods:

Spectroscopic techniques: molecular absorption, circular dichroism, molecular fluorescence, mass spectrometry, nuclear magnetic resonance.
Complementary techniques: surface plasmon resonance, isothermal titration calorimetry, biochemical methods.
Classification of techniques by ligand type and G-quadruplex sequence (human telomeric, oncogene promoter).

Main Results:

Detailed overview of qualitative and quantitative information obtainable from each technique.
Examples of technique applications for different ligand families and G-quadruplex structures.
Assessment of the strengths and limitations of various experimental approaches.

Conclusions:

A comprehensive understanding of available experimental techniques is vital for G-quadruplex-ligand interaction studies.
The choice of technique depends on the specific research question and the nature of the ligand and G-quadruplex.
This review provides a valuable resource for researchers in drug discovery and molecular biology.