Biotinylated Antigen Binding
Biotinylated Antigen Binding - Related Videos
09:13
Cell-surface Biotinylation Assay
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2023
A cell can regulate the amount of particular proteins on its cell membrane through endocytosis, following which cell surface proteins are effectively sequestered in the cytoplasm. Once within a cell, these surface proteins can be either destroyed or “recycled” back to the membrane. The cell surface biotinylation assay provides researchers with a way to study these phenomena. The technique makes use of a derivative of the small molecule biotin, which can label surface proteins and then be...
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.
07:55
An Optimized Quantitative Pull-Down Analysis of RNA-Binding Proteins Using Short Biotinylated RNA
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Cited by 3 •
2023
Here, we present an optimized in vitro method to uncover, quantify, and validate protein interactors of specific RNA sequences, using total protein extract from human cells, streptavidin beads coated with biotinylated RNA, and mass spectrometry analysis.
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.
15:04
PeptiQuick, a One-Step Incorporation of Membrane Proteins into Biotinylated Peptidiscs for Streamlined Protein Binding Assays
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Cited by 14 •
2019
We present a method that combines membrane protein purification and reconstitution into peptidiscs in a single chromatographic step. Biotinylated scaffolds are used for direct surface attachment and measurement of protein-ligand interactions via biolayer interferometry.
FAQs
The antigen must retain the epitopes, or antibody-recognition regions, that support the intended immune interaction after biotin is attached. If labeling alters those regions, binding measurements may no longer reflect the original antigen-antibody or antigen-receptor relationship. Preserving epitope recognition therefore helps researchers interpret detection, specificity, and comparative binding results accurately.
Biotin provides a molecular handle that can be recognized by streptavidin or avidin linked to a reporter or solid support. This connection converts antigen recognition into a detectable or isolatable signal without requiring the capture component to recognize the antigen directly. Its selectivity supports measurements of immune interactions and recovery of antigen-bound material.
The strategy can reveal whether antibodies or immune-cell receptors recognize a particular antigen and can support comparisons of binding strength or abundance. In infection studies, these readouts help distinguish differences in host-pathogen responses. The resulting information can be used to examine antibody specificity, antigen-reactive cells, and the distribution of immune recognition across samples.
A typical workflow begins by chemically linking biotin to the antigen while maintaining its relevant epitopes. The labeled antigen is then allowed to bind its specific antibody or receptor. Streptavidin or avidin attached to a reporter or solid support captures the biotin-linked complex, enabling researchers to detect, isolate, or measure the interaction.
Researchers may select this approach when they need to examine antibody specificity, antigen presentation, pathogen serology, or immune-cell receptor interactions. It is especially useful when antigen-reactive cells or immune binding events must be tracked. These applications connect molecular recognition with broader studies of host-pathogen responses, diagnostic development, and vaccine research.
Results can indicate which antibodies or receptors recognize an antigen and can support comparisons of interaction strength or the amount of binding activity. In pathogen-related research, those measurements help characterize serological responses and identify antigen-reactive immune cells. The method therefore provides a bridge between molecular binding data and evaluation of immune responses relevant to diagnosis or vaccination.