Biotin-avidin Pull-down
Biotin-avidin Pull-down - Related Videos
03:12
An Avidin-Biotin Conjugation Technique for Presenting Target Antigens on Mycobacterium bovis BCG
0 Views •
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.
05:43
An In Vitro Assay to Study Platelet Migration Using RGD-Functionalized Avidin-Biotin Tethers
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2024
A detailed protocol for imaging single migrating platelets using RGD-functionalized avidin-biotin tethers with tunable density is provided, revealing that platelets generate enough force to rupture the avidin-biotin bond.
10:11
Expression of Exogenous Antigens in the Mycobacterium bovis BCG Vaccine via Non-genetic Surface Decoration with the Avidin-biotin System
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2018
A novel technique for rapid antigen display on a bacterial surface is presented, which involves surface biotinylation followed by exposure to proteins of interest in fusion with monomeric avidin. Loading BCG with selected antigens successfully improves its immunogenicity, suggesting that surface decoration can replace traditional genetic approaches.
08:08
Co-Immunoprecipitation and Pull-Down Assays
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2023
Co-immunoprecipitation (CoIP) and pull-down assays are closely related methods to identify stable protein-protein interactions. These methods are related to immunoprecipitation, a method for separating a target protein bound to an antibody from unbound proteins. In CoIP, an antibody-bound protein is itself bound to another protein that does not bind with the antibody, this is followed by a separation process that preserves the protein-protein complex. The difference in pull-down assays is that...
06:26
Pulling Membrane Nanotubes from Giant Unilamellar Vesicles
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Cited by 42 •
2017
Many proteins in the cell sense and induce membrane curvature. We describe a method to pull membrane nanotubes from lipid vesicles to study the interaction of proteins or any curvature-active molecule with curved membranes in vitro.
FAQs
The strength of the biotin-avidin interaction is central because it allows a labeled bait or analyte to remain associated with immobilized avidin or streptavidin during handling of a mixture. This stable capture supports selective enrichment, particularly when the desired molecule or complex occurs at low abundance. The retained fraction can then be examined for composition or binding partners.
The biotin label provides the capture handle that connects the bait or analyte to the bead-bound affinity partner. Molecules associated with that captured species may remain in the retained material, allowing the experiment to examine molecular complexes rather than only the labeled component. Consequently, the choice of labeled species establishes which interaction or composition question the assay can address.
Washing separates material that did not remain associated with the immobilized capture system from the bait or complex retained on the beads. This step reduces unrelated components in the recovered fraction and improves the specificity of downstream analysis. The resulting material is therefore more suitable for identifying interaction partners, assessing molecular composition, or enriching a selected biomolecule from a mixture.
A typical workflow combines a biotin-labeled bait or analyte with avidin- or streptavidin-coated beads, allows the capture interaction to retain the selected material, and washes away unbound components. The bead-associated fraction is then recovered for analysis through elution or denaturation. These stages connect selective binding with preparation of a fraction that can be examined experimentally.
After washing, retained material can be subjected to elution or denaturation before analysis. Elution provides a way to recover the captured fraction, whereas denaturation prepares the retained material for examination in a disrupted state. Analysis of that fraction can reveal the molecular composition of a captured complex or help identify molecules associated with the labeled bait.
Biotin-avidin Pull-down is useful when researchers need to enrich or examine selected molecular material from a mixture. Supported applications include protein purification, protein-protein interaction studies, and analysis of nucleic acid-associated complexes. Its ability to capture low-abundance biomolecules also makes it valuable for investigating interaction partners and characterizing the composition of biochemical assemblies.