Biotinylated Antigen
Biotinylated Antigen - 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...
04:34
An Immunohistochemistry Staining for the Detection of Rabies Virus Antigens
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2025
This video demonstrates immunohistochemistry staining for rabies virus antigen detection in infected mouse brain tissue. The process includes deparaffinization and alcohol treatment, followed by proteolytic treatment to enhance antigen accessibility. Immunohistochemistry staining reveals red precipitates, confirming the presence of rabies antigens in the tissue section.
11:32
Mapping RNA-RNA Interactions Globally Using Biotinylated Psoralen
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Cited by 20 •
2017
Here, we detail the method of Sequencing of Psoralen crosslinked, Ligated, and Selected Hybrids (SPLASH), which enables genome-wide mapping of intramolecular and intermolecular RNA-RNA interactions in vivo. SPLASH can be applied to study RNA interactomes of organisms including yeast, bacteria and humans.
06:43
In Vivo Proximity Biotinylation for Protein Interaction Studies in Paramecium tetraurelia
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Cited by 1 •
2025
The protocol presents a method for in vivo covalent attachment of biotin to proteins based on their proximity to a biotin ligase fused to a protein of interest. This modification allows for a selective enrichment of the proteins using streptavidin beads as needed in protein interaction studies.
03:12
An Avidin-Biotin Conjugation Technique for Presenting Target Antigens on Mycobacterium bovis BCG
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2025
The video demonstrates a technique for loading antigens on Mycobacterium bovis BCG to improve its immunogenic properties. The method uses the avidin-biotin system to coat the bacterial surface with exogenous antigens.
FAQs
The central mechanism is the exceptionally strong interaction between biotin and streptavidin or avidin. Once the tagged antigen encounters one of these binding partners, the complex can be connected to a fluorescent, enzymatic, or magnetic reporter system. This converts antigen recognition into a measurable signal or a controllable capture step for immunological assays.
Biotinylation is useful because the tag can support detection while substantially preserving the antigen’s interactions with antibodies or immune receptors. That separation between the biological recognition function and the reporting function helps investigators measure antigen-specific responses without relying on an inherently fluorescent or enzymatic antigen. It also supports more consistent assay design.
Streptavidin and avidin serve as the molecular bridge between the antigen and the assay readout. Depending on the attached reporter, the same binding principle can produce fluorescence, an enzymatic signal, or magnetic capture. Choosing among these formats changes how investigators observe or isolate antigen-specific material, while retaining the common biotin-binding mechanism.
A typical workflow begins with the tagged antigen, followed by exposure to a streptavidin- or avidin-linked detection or capture system. The resulting association is then used within flow cytometry, ELISA, or affinity-based isolation. The selected format determines whether the outcome is a detectable signal or enrichment of antigen-specific antibodies or cells.
In flow cytometry, fluorescent reporter systems linked through biotin-binding interactions allow antigen-specific material to be detected as a measurable fluorescence pattern. This makes it possible to characterize immune responses and identify cells associated with pathogen-specific targets. The approach is useful when researchers need a sensitive, controlled way to connect antigen recognition with cellular analysis.
In ELISA, an enzymatic reporter connected through the biotin-binding system supplies a signal that can be measured after antigen-related binding occurs. This format supports sensitive assessment of immune responses and can help compare recognition of pathogen-specific targets. Its value lies in separating the antigen’s recognition role from the enzyme-based readout used to evaluate the assay.
Affinity-based isolation uses the same biotin interaction for controlled capture rather than only signal generation. A magnetic reporter system can help retain the relevant antigen-associated material, enabling isolation of antigen-specific antibodies or cells. In infection research, this provides a route to examine which immune components recognize pathogen-specific targets, complementing signal-based measurements from flow cytometry or ELISA.