Antigen Binding
Antigen Binding - Related Videos
15:27
Determination of High-affinity Antibody-antigen Binding Kinetics Using Four Biosensor Platforms
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Cited by 30 •
2017
We describe here protocols for the measurement of antibody-antigen binding affinity and kinetics using four commonly used biosensor platforms.
07:39
Determining Binding Affinity (KD) of Radiolabeled Antibodies to Immobilized Antigens
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2022
Here, a method is described to determine the binding affinity (KD) of radiolabeled antibodies to immobilized antigens. KD is the equilibrium dissociation constant that can be determined from a saturation binding experiment by measuring the total, specific, and nonspecific binding of a radiolabeled antibody at various concentrations to its antigen.
05:04
Viral Antigen Microarray Assay to Detect Antibody Isotypes in Serum Against Viral Antigen
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2025
In this video, we demonstrate the process for detecting antibody isotypes in multiple human serum samples using a microarray slide printed with antigenic subtypes of influenza virus strains.
06:57
Development of an Antigen-driven Colitis Model to Study Presentation of Antigens by Antigen Presenting Cells to T Cells
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Cited by 9 •
2016
In this antigen-driven colitis model, OT-II CD4+ T cells expressing a red fluorescent protein were adoptively transferred into RAG-/- mice that express a green fluorescent protein in mononuclear phagocytes (MPs). The hosts were challenged with Escherichia coli (E.coli) expressing the ovalbumin protein (OVA) fused to a cyan fluorescent protein (CFP).
02:18
The Equilibrium Binding Constant and Binding Strength
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2020
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: where P and L are the unbound protein and ligand, respectively, and PL is the protein-ligand complex. As the amount of bound ligand is also related to the rate of ligand binding, experiments can also determine Kb by examining the rates of protein-ligand association (kon) and dissociation (koff) using the following ratio: Thus,...
FAQs
Binding strength reflects the combined effect of hydrogen bonds, electrostatic forces, hydrophobic interactions, and van der Waals forces. Because these contributions act together, changing the molecular fit can alter affinity, the tendency of the interaction to remain associated. The same physical basis also helps explain specificity, because complementary molecular features favor one target over others.
Reversibility allows recognition interactions to be temporary rather than permanently fixed. That property is important because immune recognition must support changing molecular contacts, including those associated with signaling, antigen presentation, and immune regulation. In experimental systems, reversible binding also makes target recognition measurable without implying irreversible chemical attachment.
When an antigen engages an antibody or B-cell receptor, the binding event can do more than mark molecular complementarity. It can initiate immune signaling, while interactions involving immune recognition can also support antigen presentation, the process that makes antigenic information available for immune response. Consequently, binding connects molecular recognition with downstream immune activity and regulation.
Laboratory use begins by selecting a recognition molecule whose binding can reveal the target of interest. ELISA uses that interaction to detect target molecules, flow cytometry applies it for detection in a measurement workflow, and immunoprecipitation uses binding to isolate targets. The shared principle is specific recognition, but the experimental outcome differs between detection and isolation.
Immunoprecipitation is especially useful when the goal is to isolate a target rather than simply register its presence. A recognition molecule binds the target, allowing the antigen-binding interaction to serve as the basis for separating or collecting that molecule. This makes the method relevant to experiments focused on obtaining a target for subsequent study, as distinct from detection-oriented assays.
Antigen binding supports several research and translational goals because it links molecular recognition to measurable target detection and immune function. Researchers can apply binding studies to antibody design, vaccine evaluation, and diagnostic development, while biological investigations use them to examine host-pathogen recognition and immune regulation. These applications depend on preserving the relevant complementarity and binding behavior.