Cobalt Coated Beads
Cobalt Coated Beads - Related Videos
03:24
Organelle Dynamics in B Lymphocytes following Activation with Antigen-Coated Beads
0 Views •
2025
In this video, we describe a method to study the organelle dynamics in B lymphocytes following their activation with antigen-coated microbeads.
11:46
Synthesis of an Oxygen-Carrying Cobalt(II) Complex
0 Views •
2023
Source: Deepika Das, Tamara M. Powers, Department of Chemistry, Texas A&M University Bioinorganic chemistry is the field of study that investigates the role that metals play in biology. Approximately half of all proteins contain metals and it is estimated that up to one third of all proteins rely on metal-containing active sites to function. Proteins that feature metals, called metalloproteins, play a vital role in a variety of cell functions that are necessary for life. Metalloproteins...
15:07
Growth Factor-Coated Bead Placement on Dorsal Forebrain Explants
0 Views •
Cited by 1 •
2007
This video demonstrates two methods for preparing and placing beads, which have been coated with growth factor, on explants of the developing cerebral cortex. These beads can be used to induce spatially restricted gene expression on developing neural tissue such as forebrain explants. Methods are given for using both Affi-Gel beads and heparin acryllic beads.
09:25
Placing Growth Factor-Coated Beads on Early Stage Chicken Embryos
0 Views •
Cited by 2 •
2007
A variety of growth factors and proteins interact to induce cells to take on different cell fates during development. Here we demonstrate the use of an in ovo preparation to address possible interactions between different proteins in development by placing beads on E2.5 chick embryos.
08:10
A Liquid Phase Affinity Capture Assay Using Magnetic Beads to Study Protein-Protein Interaction: The Poliovirus-Nanobody Example
0 Views •
Cited by 3 •
2012
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.
FAQs
Recognition depends on coordination between cobalt ions on the bead surface and histidine residues within a polyhistidine tag. This interaction gives tagged recombinant proteins an affinity that untagged lysate components generally do not share. As a result, the target can remain associated with the beads while unrelated biomolecules are separated during the purification workflow.
Washing removes cell-lysate components that remain associated with the bead material without the intended histidine-mediated interaction. Its purpose is to improve enrichment before the target is released. Effective washing therefore affects sample cleanliness and helps produce a protein preparation more suitable for subsequent structural or biochemical analysis.
Imidazole or altered buffer conditions can disrupt the interaction between cobalt ions and histidine residues, promoting release of the bound polyhistidine-tagged protein. This separates the capture phase from the recovery phase of purification. Researchers can therefore use changes in solution chemistry to move the target from the solid phase into a collected protein fraction.
A basic workflow introduces the beads to a cell lysate so the polyhistidine-tagged protein can bind, followed by washing to remove untagged material. The retained target is then eluted with imidazole or changed buffer conditions. This sequence converts a complex biological mixture into an enriched fraction for later protein characterization or experimentation.
Solution conditions are central because they determine whether the histidine-containing target remains associated with the cobalt surface or is released. Imidazole concentration and buffer changes are especially relevant during elution, while washing conditions must remove unwanted lysate components without losing the bound target. Adjusting these conditions helps balance enrichment, recovery, and sample cleanliness.
They are useful when researchers need to isolate recombinant proteins from cell lysates before structural or biochemical studies. The beads simplify sample preparation by combining selective capture, removal of untagged components, and controlled target release in one workflow. The resulting enrichment can support experiments that require a more focused protein sample than the original lysate provides.