Streptavidin-biotin Binding
Streptavidin-biotin Binding - Related Videos
03:41
Analyzing Influenza Virus Internalization Using a Streptavidin Blocking Assay
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2026
Source: Pohl, M. O. & Stertz, S. Measuring Attachment and Internalization of Influenza A Virus in A549 Cells by Flow Cytometry. J. Vis. Exp. (2015)This video demonstrates the use of a streptavidin blocking assay to distinguish surface-bound from internalized influenza virus in human lung epithelial cells. Comparing fluorescence signals shows that a higher intensity after incubation indicates successful viral internalization.
05:16
Assessing the Internalization of Target Surface Proteins Using a Biotin Derivative
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2025
This video demonstrates a method to assess target protein internalization in the mouse cortical astrocytes using biotinylation, followed by cell lysis, streptavidin-based protein extraction, denaturation, and Western blot analysis to confirm successful internalization.
04:10
Helicase Activity Measurement of a Target Protein Using Biotin-Labeled RNA Duplexes
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2025
In this video, we demonstrate the procedure to determine the helicase activity of a target protein to unwind the biotin-labeled dsRNA substrate. The activity of the enzyme was identified by analyzing the electrophoretic mobility shift, followed by a chemiluminescence assay using chemiluminescent enzyme-conjugated streptavidin.
16:33
Detection of Protein Palmitoylation in Cultured Hippocampal Neurons by Immunoprecipitation and Acyl-Biotin Exchange (ABE)
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Cited by 108 •
2013
The reversible addition of palmitate to proteins is an important regulator of intracellular protein trafficking. This is of particular interest in neurons where many synaptic proteins are palmitoylated. We utilize a simple biochemical method to detect palmitoylated proteins in cultured neurons, which can be adapted for multiple cell types and tissues.
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
Biotin is accommodated in a binding pocket on each streptavidin subunit. Hydrogen bonds help provide specific contacts, while hydrophobic interactions further stabilize the association. Together, these interactions create a selective molecular pairing rather than a nonspecific attachment. This structural complementarity explains why researchers can use the complex to recognize and capture biotin-tagged biological material.
Each streptavidin subunit contributes a binding pocket for biotin, giving the protein multiple potential sites for interaction. This arrangement is important when streptavidin is used as a tool, because a preparation can connect biotin-containing targets with a labeled or immobilized protein framework. The subunit-level pockets therefore support both molecular recognition and practical capture or signal generation.
The exceptionally high affinity keeps biotin associated with streptavidin strongly enough to support selective handling of tagged targets. In an assay, that stable association helps retain the intended protein, nucleic acid, cell, or other molecule during detection or separation. As a result, the interaction can provide a dependable molecular link for sensitive analysis rather than merely transient labeling.
The interaction combines exceptionally high affinity with molecular specificity, and the complex remains useful under many experimental conditions. That combination broadens its experimental role: the same binding principle can support purification, detection, or visualization depending on which binding partner is labeled or immobilized. Its value therefore comes from both stable association and selective recognition of biotin-tagged material.
Researchers first attach biotin to the protein, nucleic acid, cell, or other molecule of interest. They then introduce streptavidin in either a labeled or immobilized form so it can associate with the biotin tag. The resulting complex can provide a detectable signal, enable visualization, or retain the tagged material for purification or targeted separation, depending on the experimental goal.
Labeled streptavidin can help reveal or visualize a biotin-tagged target, whereas immobilized streptavidin can help retain that target for affinity purification or targeted separation. The choice depends on the desired outcome: generate an observable signal, isolate selected material, or combine capture with analysis. Both formats use the same specific interaction but translate it into different experimental functions.
Biotin can be attached to proteins, nucleic acids, cells, and other molecules, allowing streptavidin-based tools to address several classes of biological targets. Depending on the experimental design, the interaction supports immunoassays, molecular labeling, affinity purification, targeted separation, or visualization. These applications help researchers detect, isolate, or observe selected material through the same biotin-based molecular linkage.