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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

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Flow Cytometry

Flow Cytometry

The development of flow cytometry techniques began in 1934 with initial attempts by Andrew Moldavan, a bacteriologist who counted the cells in a flowing capillary system. Moldavan pumped cells through a capillary tube focused under a microscope for visualization. The invention of photometry allowed the measurement of differentially-stained cells, and Louis Kamentsky developed the first multiparameter flow cytometer in 1965 to identify and count the cancer cells in cervical tissue specimens.
In...

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: Feb 15, 2026

Cell Aggregation Assays to Evaluate the Binding of the Drosophila Notch with Trans-Ligands and its Inhibition by Cis-Ligands

Cell Aggregation Assays to Evaluate the Binding of the Drosophila Notch with Trans-Ligands and its Inhibition by Cis-Ligands

Published on: January 2, 2018

Notch Ligand Binding Assay Using Flow Cytometry.

Shweta Varshney¹, Pamela Stanley¹

¹Department of Cell Biology, Albert Einstein College of Medicine, New York, USA.

|January 16, 2018

Summary

This summary is machine-generated.

Notch signaling is crucial for development and tissue homeostasis. This study characterizes Notch ligand binding to receptors in isolated cells using Fc-tagged ligands and flow cytometry.

Keywords:

DLL1 DLL4 Fc-tag Flow cytometry JAG1 JAG2 Notch ligand binding assay

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Cell Aggregation Assays to Evaluate the Binding of the Drosophila Notch with Trans-Ligands and its Inhibition by Cis-Ligands

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Published on: January 2, 2018

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Area of Science:

Developmental Biology
Cell Signaling
Molecular Biology

Background:

Notch signaling is an evolutionarily conserved pathway vital for development and tissue homeostasis.
Ligand-receptor binding is a key regulatory mechanism controlling Notch pathway activity.
Glycosylation of Notch receptors critically influences signaling strength.

Purpose of the Study:

To characterize Notch ligand binding to Notch receptors in isolated cells.
To establish a method for quantifying ligand-receptor interactions in vitro.

Main Methods:

Utilized recombinant Notch ligand extracellular domains fused to a human Fc tag.
Employed flow cytometry to detect binding of fluorescent anti-Fc antibodies.
Quantified ligand-receptor interactions on isolated cells.

Main Results:

Developed a flow cytometry-based assay to measure Notch ligand-receptor binding.
Demonstrated the utility of Fc-tagged ligands for studying these interactions.

Conclusions:

The described method allows for characterization of Notch ligand binding dynamics.
This approach facilitates further investigation into Notch signaling regulation.