Peptide Affinity Capture
Peptide Affinity Capture - Related Videos
10:37
Protein Complex Affinity Capture from Cryomilled Mammalian Cells
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Cited by 37 •
2016
Here we describe protocols to disrupt mammalian cells by solid-state milling at a cryogenic temperature, produce a cell extract from the resulting cell powder, and isolate protein complexes of interest by affinity capture upon antibody-coupled micron-scale paramagnetic beads.
13:49
Semi-automated Biopanning of Bacterial Display Libraries for Peptide Affinity Reagent Discovery and Analysis of Resulting Isolates
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Cited by 6 •
2017
Biopanning bacterial display libraries is a proven technique for discovery of peptide affinity reagents, a robust alternative to antibodies. The semi-automated sorting method herein has streamlined biopanning to decrease the occurrence of false positives. Here we illustrate the thought process and techniques applied in evaluating candidates and minimizing downstream analysis.
08:10
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 •
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.
14:58
Identification of Protein Complexes in Escherichia coli using Sequential Peptide Affinity Purification in Combination with Tandem Mass Spectrometry
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Cited by 11 •
2012
Affinity purification of tagged proteins in combination with mass spectrometry (APMS) is a powerful method for the systematic mapping of protein interaction networks and for investigating the mechanistic basis of biological processes. Here, we describe an optimized sequential peptide affinity (SPA) APMS procedure developed for the bacterium Escherichia coli that can be used to isolate and characterize stable multi-protein complexes to near homogeneity even starting from low copy numbers per...
03:07
Electron Affinity
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2020
The electron affinity (EA) is the energy change for adding an electron to a gaseous atom to form an anion (negative ion). This process can be either endothermic or exothermic, depending on the element. Many of these elements have negative values of EA, which means that energy is released when the gaseous atom accepts an electron. However, for some elements, energy is required for the atom to become negatively charged, and the value of their EA is positive. Just as with ionization energy,...
FAQs
Selectivity comes from the peptide ligand’s ability to recognize the target while remaining reversibly associated with the support. That reversibility is chemically important: the interaction can persist during sample loading and washing, yet be weakened later by changing solution conditions. The result is a controllable capture-and-release cycle rather than permanent attachment of the biomolecule.
These variables determine whether the peptide-target interaction remains strong enough for capture or becomes weak enough for release. Changing pH, ionic strength, or solvent conditions can therefore disrupt binding after unwanted components have been removed. Condition selection balances retention during washing with recovery during elution. In chemistry workflows, solution composition is a central control variable.
A wash step removes nonspecific components that pass through or remain associated without the intended recognition event. This improves the composition of the retained fraction before release. Its importance is especially clear for complex mixtures, where target enrichment depends not only on binding, but also on discriminating captured material from background.
Ligand design or selection establishes the recognition element of the separation. A peptide chosen for a particular target can be immobilized on the support, allowing that target to be retained while other sample constituents are removed. This links peptide chemistry directly to selectivity and makes ligand choice central to the method.
An operational sequence begins by passing the sample through the immobilized peptide support. The target-containing material is allowed to interact with the ligand, while nontarget constituents are removed during washing. The retained fraction is then recovered by changing pH, ionic strength, or solvent conditions to disrupt binding. This workflow supports controlled enrichment from mixtures.
This approach is useful when a desired protein, antibody, or other biomolecule must be enriched or purified from a complex mixture. Because capture depends on reversible recognition, the method can provide a retained fraction for subsequent analysis or processing. It is therefore relevant to enrichment and purification workflows involving complex samples.
In chemistry, the method provides a practical setting for examining molecular recognition and protein interactions while also serving as a separation tool. Its use in analytical workflows, proteomics, and biopharmaceutical research connects ligand-mediated binding to measurable target enrichment or purification. These roles make it relevant to both interaction studies and biomolecule processing.