Streptavidin Isolation
Streptavidin Isolation - 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.
08:07
Analyzing DNA-Protein Interactions with Streptavidin-Based Biolayer Interferometry
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2025
This article describes a protocol for studying DNA-protein interactions using a streptavidin-based biolayer interferometry (BLI) system. It outlines the essential steps and considerations for utilizing either basic or advanced binding kinetics to determine the equilibrium binding affinity (KD) of the interaction.
04:51
Streptavidin-Affinity Grid Fabrication for Cryo-Electron Microscopy Sample Preparation
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Cited by 15 •
2023
A step-by-step protocol for fabricating streptavidin affinity grids is provided for use in structural studies of challenging macromolecular samples by cryo-electron microscopy.
11:11
Desthiobiotin-Streptavidin-Affinity Mediated Purification of RNA-Interacting Proteins in Mesothelioma Cells
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Cited by 6 •
2018
Desthiobiotin labeling of a synthetic 25-nucleotide RNA oligo, which contains an adenine-rich element (ARE) motif, allows specific binding of cytosolic ARE-binding protein.
05:13
Isolation of Proteins from Viral DNA-protein Complexes
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2026
Source: Dembowski, J. A., et al. Purification of Viral DNA for the Identification of Associated Viral and Cellular Proteins. J. Vis. Exp. (2017).This video demonstrates the isolation of protein–viral DNA complexes from cell nuclei using click chemistry and magnetic bead purification. The protocol involves labeling viral genomes with alkyne-modified nucleotides, biotinylation via a click reaction, and binding to streptavidin-coated magnetic beads. Following washing and heat elution, the purified...
FAQs
The separation depends on the exceptionally strong and selective noncovalent interaction between streptavidin and biotin. Immobilized biotin or a biotinylated target provides a capture surface, allowing the desired streptavidin-associated material to remain bound while other biomolecules are removed. This molecular selectivity is the central principle that enables affinity-based purification.
Streptavidin’s tetrameric organization and stability support its use in purification formats that depend on persistent biotin binding. These properties help maintain the protein’s functional affinity during separation and subsequent preparation of affinity matrices, labeled probes, or protein purification systems. Its high-affinity interaction is especially useful when precise molecular capture is required.
Washing and elution create the separation between specifically retained material and the remaining sample components. Washing removes biomolecules that do not remain associated with the affinity interaction, whereas controlled elution releases the captured streptavidin or biotin-binding fraction. Managing these stages determines whether the recovered material is sufficiently separated for downstream molecular biology or assay applications.
A typical workflow presents the sample to immobilized biotin or a biotinylated target so the relevant interaction can occur. The affinity material is then washed to remove other biomolecules, followed by controlled elution of the retained fraction. The recovered material can subsequently support probe preparation, affinity-matrix construction, or protein purification systems.
The isolation strategy can be directed toward recovering streptavidin as a purified protein or toward separating and retaining its biotin-binding activity in an affinity format. This distinction affects how the recovered material is used: purified protein can support labeled probes, while retained binding activity can contribute to capture systems designed for selective biomolecular purification.
Isolated streptavidin supports several applications that require selective biomolecular detection or capture. These include labeled probes, affinity matrices, protein purification systems, imaging, diagnostics, and assays. Its combination of stability and strong biotin recognition makes it useful when researchers need a defined interaction to connect, retain, or detect specific molecular targets.