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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

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...

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

Thermal expansion and Thermal stress: Problem Solving

Thermal expansion and Thermal stress: Problem Solving

San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55...

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Related Experiment Video

Updated: Feb 14, 2026

Author Spotlight: Advancing Structural and Biochemical Studies of Proteins Through Thermal Shift Assays

Author Spotlight: Advancing Structural and Biochemical Studies of Proteins Through Thermal Shift Assays

Published on: August 9, 2024

Screening Chemoreceptor-Ligand Interactions by High-Throughput Thermal-Shift Assays.

Maximilian K G Ehrhardt¹, Suzanne L Warring¹, Monica L Gerth²

¹Department of Biochemistry, University of Otago, Dunedin, New Zealand.

Methods in Molecular Biology (Clifton, N.J.)

|February 12, 2018

Summary

Fluorescence thermal shift (FTS) assays offer a rapid and cost-effective method for screening chemoreceptor ligands. This study details a high-throughput protocol using FTS for efficient chemoreceptor-ligand discovery.

Keywords:

Binding Chemoreceptor Differential scanning fluorometry Fluorescence thermal shift assay High-throughput Ligand Ligand binding domain Screening Signal molecule

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Method for Efficient Refolding and Purification of Chemoreceptor Ligand Binding Domain

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Method for Efficient Refolding and Purification of Chemoreceptor Ligand Binding Domain

Method for Efficient Refolding and Purification of Chemoreceptor Ligand Binding Domain

Published on: December 12, 2017

Area of Science:

Biochemistry
Molecular Biology
Biophysics

Background:

Identifying chemoreceptor ligands is crucial for understanding cellular signaling.
Current screening methods are often limited by low throughput, high cost, and time consumption.

Purpose of the Study:

To present a high-throughput protocol for chemoreceptor ligand screening using fluorescence thermal shift (FTS) assays.
To demonstrate the utility of FTS assays in a 96-well plate format for efficient ligand discovery.

Main Methods:

Utilized fluorescence thermal shift (FTS) assays to measure protein denaturation temperatures.
Developed a high-throughput, 96-well plate compatible protocol for FTS screening.
Employed Biolog Phenotype Microarray plates as a convenient ligand library.

Main Results:

Demonstrated that FTS assays provide a fast and inexpensive approach to chemoreceptor-ligand screening.
Showcased the successful adaptation of FTS assays for high-throughput screening.
Confirmed that an increase in melting temperature (T _m ) indicates ligand binding.

Conclusions:

Fluorescence thermal shift (FTS) assays are a viable and efficient method for high-throughput screening of chemoreceptor ligands.
The presented protocol facilitates rapid and cost-effective identification of novel chemoreceptor-ligand interactions.
The methodology is adaptable to various ligand library formats, enhancing its broad applicability.