Streptavidin Bead Binding
Streptavidin Bead 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.
04:49
A Multiplex Bead-Based Immunoassay to Quantify Multiple Cytokine Targets
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2025
This video demonstrates a multiplex bead-based immunoassay for quantifying multiple cytokine targets in a sample. A mixture of distinct microspheres conjugated to cytokine-specific antibodies is used to bind the cytokines present in the sample. Streptavidin-tagged reporters are immobilized on the bound-cytokines using biotinylated detection antibodies. Flow cytometry identifies the bound cytokines based on the unique sizes and internal fluorescence intensities of the microspheres, while the...
04:03
Magnetic Bead-based Exosome Extraction: A Technique to Isolate Specific Exosomes from Biofluids
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2023
In this video, we demonstrate a procedure to isolate exosomes from target biofluids using magnetic microbeads. The procedure enables the rapid capture of exosomes, which can be used for downstream analysis.
11:19
Novel RNA-Binding Proteins Isolation by the RaPID Methodology
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2016
RNA-protein interactions lie at the heart of many cellular processes. Here, we describe an in vivo method to isolate specific RNA and identify novel proteins that are associated with it. This could shed new light on how RNAs are regulated in the cell.
04:46
A Multiplex Bead-Based Assay for Analyzing Cytokines in Human Tear Samples
0 Views •
2025
This video illustrates a bead-based multiplex assay for analyzing cytokines in human tears. The method allows for the simultaneous analysis of multiple cytokines from a single sample, providing enhanced sensitivity for studying immune responses in various pathophysiological conditions.
FAQs
The streptavidin-biotin interaction provides the selectivity that makes bead-based enrichment possible. When a desired molecule carries biotin, it can associate with streptavidin on the bead while nonbiotinylated material remains available for removal. This molecular recognition helps reduce nonspecific material in the retained fraction and supports focused downstream genetic analysis.
The same capture principle can be applied to biotinylated DNA, RNA, proteins, or molecular probes. Thus, the bead system is not restricted to one biomolecule type: the experiment can adapt the biotin label to the target or probe being studied. This flexibility supports both nucleic-acid workflows and investigations of molecular complexes.
Washing separates retained complexes from unbound material after binding has occurred. Because the target is associated with the streptavidin-coated bead through biotin, the bead-bound fraction can remain in place while unattached molecules are removed. The resulting enrichment is important when the goal is to analyze a specific nucleic acid, protein, or complex.
A typical workflow begins with a biotinylated target or probe encountering streptavidin-coated beads. After the desired association forms, washing removes unbound material. The retained bead-associated molecules are then released or analyzed, depending on the downstream objective. This sequence links selective capture with purification, enrichment, or direct molecular characterization.
In genetics, researchers can use the method for nucleic acid purification, affinity capture, and sequencing workflows. It can enrich selected genetic material before downstream analysis, which may simplify handling of complex samples. The same approach also provides a way to retain molecular probes or complexes relevant to genetic investigations.
Biotinylated components can anchor a protein-DNA or protein-RNA complex to the bead, allowing unbound material to be washed away before analysis. This creates an affinity-capture route for examining associations between nucleic acids and proteins rather than analyzing each molecule in isolation. In genetics, that capability supports investigation of molecular interactions within genetic material.