Ligand Immobilization
Ligand Immobilization - Related Videos
02:40
Ligand Binding Sites
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2020
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...
02:51
Metal-Ligand Bonds
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2020
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...
05:13
Biolayer Interferometry Technology to Detect Interactions between Ligand and Analyte
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2025
In this video, we demonstrate biolayer interferometry (BLI) technology to detect the intermolecular interactions between ligands and target analytes in real-time. BLI measures changes in the interference pattern of white light reflected off a layer of immobilized ligands on a biosensor surface as they interact with analytes in solution.
00:49
Ligand Binding and Linkage
0 Views •
2020
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...
02:12
Inducing Depression-like Behavior in a Mouse via Immobilization Stress
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2025
This video demonstrates the method of inducing chronic stress in a mouse through repeated immobilization, leading to corticosterone release and reduced glutamate receptor activity in neurons, which results in depression-like behavior.
FAQs
These three features strongly influence whether a target can reach and bind the attached ligand. Stable attachment helps the functional surface remain usable, while favorable orientation keeps recognition sites accessible. Surface density also requires control: too little ligand may reduce capture capacity, whereas excessive crowding can hinder access through steric effects. Together, these variables determine binding performance and selectivity.
Linkers provide spacing between the support and the ligand, which can make the recognition site more accessible to a target. This spacing may reduce steric hindrance, meaning physical crowding that interferes with binding. In affinity chromatography, biosensors, and other surface-based systems, linker design therefore affects how effectively the immobilized ligand can interact with molecules in its surroundings.
Covalent coupling attaches the ligand to a functionalized support through a chemical bond, whereas adsorption relies on surface association and affinity-based immobilization uses a specific binding interaction. These approaches differ in how the ligand is held and how the resulting surface is controlled. The choice affects attachment stability, ligand orientation, accessibility, and suitability for a particular chemical or analytical application.
Binding activity depends on whether immobilization preserves the ligand’s recognition site and leaves it accessible to the target. The support, attachment approach, linker arrangement, ligand orientation, and surface density all contribute. A chemically stable attachment is not sufficient if the ligand becomes inaccessible or crowded. Evaluating activity is therefore essential when optimizing a functionalized surface.
A general workflow begins by selecting an insoluble or surface-bound support suited to the intended use, followed by choosing covalent coupling, adsorption, or affinity-based attachment. Functionalized polymers, nanoparticles, membranes, or electrode surfaces may serve as supports. The resulting material should then be assessed for attachment stability, ligand accessibility, surface density, and retained binding activity.
In affinity chromatography, an immobilized ligand provides a selective surface for capturing a target during separation. In biosensors, the same principle places recognition chemistry at a sensing interface, including an electrode surface. These applications depend on selective target binding, so ligand accessibility and stable attachment are important for obtaining a useful capture or detection response.
Immobilized ligands can create a controlled arrangement of catalysts or biomolecules on polymers, nanoparticles, membranes, or electrode surfaces. Attaching these functional components to a support helps organize them within a material rather than leaving them freely dispersed. Their orientation, density, and stability then become key design considerations for materials research and chemically functional interfaces.