Streptavidin Bead Capture
Streptavidin Bead Capture - Related Videos
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Automatic Laser-based Geometry Capture for Finite Element Analysis of Weld Beads
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A process is described for acquiring near-real-time metrology of weld beads and prepare the resulting geometry automatically for finite element analysis.
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Analyzing Influenza Virus Internalization Using a Streptavidin Blocking Assay
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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.
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A Liquid Phase Affinity Capture Assay Using Magnetic Beads to Study Protein-Protein Interaction: The Poliovirus-Nanobody Example
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Cited by 3 •
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In this article, a simple, quantitative, liquid phase affinity capture assay is presented. It is a reliable technique based on the interaction between magnetic beads and tagged proteins (e.g. nanobodies) on one hand and the affinity between the tagged protein and a second, labeled protein (e.g. poliovirus) on the other.
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The Virus-Like Particles Capture Assay: A Method to Isolate Antigen-Displaying VLPs from a Sample Using Neutralizing Antibody-Conjugated Magnetic Beads
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In this video, we demonstrate an immunoprecipitation assay, called the VLP capture assay, to isolate antigen-displaying virus-like particles, or VLPs, from a sample. The antigen binds with specific antibodies bound to magnetic beads, forming an immobilized antigen-antibody complex that is later separated and stored for further analysis.
06:26
Selective Capture of 5-hydroxymethylcytosine from Genomic DNA
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Cited by 5 •
2012
Described is a two-step labeling process using β-glucosyltransferase (β-GT) to transfer an azide-glucose to 5-hmC, followed by click chemistry to transfer a biotin linker for easy and density-independent enrichment. This efficient and specific labeling method enables enrichment of 5-hmC with extremely low background and high-throughput epigenomic mapping via next-generation sequencing.
FAQs
A biotin label serves as the recognition handle that directs a protein, nucleic acid, or other target to the streptavidin-coated bead. Once binding occurs, washing removes components that have not been retained, while the labeled material remains associated for recovery or analysis. This separation converts molecular recognition into a practical way to reduce sample complexity.
Both formats carry streptavidin and provide a surface for retaining biotin-labeled targets. Magnetic and agarose beads are alternative support formats, so the underlying recognition event remains the same even though the bead material and workflow format differ. This allows investigators to select a compatible bead system while preserving the same basis for isolating labeled molecules from complex samples.
The high selectivity of the biotin-streptavidin interaction helps favor capture of deliberately labeled molecules over unrelated sample components. Its stability allows the retained material to remain associated through the washing step, which is essential for removing background. Together, these properties improve the specificity of the isolated fraction and support sensitive analysis of targets or molecular complexes.
First, a complex sample is brought into contact with streptavidin-coated beads after the molecule of interest has been biotin-labeled. The beads retain the labeled material, and washing removes unbound sample components. The captured material is then recovered or analyzed. This sequence links labeling, affinity capture, cleanup, and downstream measurement in a single workflow.
Biotinylated proteins, nucleic acids, and other biotin-labeled targets can be enriched, even when they begin in complex samples. After capture and removal of unbound components, the retained fraction provides material for recovery or analysis. This makes the approach useful when investigators need to focus measurement on a selected molecule or on complexes associated with that labeled target.
In biochemistry, the technique supports affinity purification, pull-down assays, target enrichment, and studies of biomolecular interactions. A pull-down workflow can use the captured fraction to examine material retained with a labeled target, while enrichment reduces the complexity presented to downstream analysis. The same capture principle also contributes to diagnostic workflows that require selective isolation before measurement.