Cysteine-rich Tags
Cysteine-rich Tags - Related Videos
09:14
Synthesis of Protein Bioconjugates via Cysteine-maleimide Chemistry
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Cited by 8 •
2016
This protocol details the important steps required for the bioconjugation of a cysteine containing protein to a maleimide, including reagent purification, reaction conditions, bioconjugate purification and bioconjugate characterization.
03:27
Labeling of Surface-Accessible Cysteine Residues in Engineered Virus-Like Particles
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2026
Source: Natilla, A.,and Hammond, R. W. Analysis of the Solvent Accessibility of Cysteine Residues on Maize rayado fino virus Virus-like Particles Produced in Nicotiana benthamiana Plants and Cross-linking of Peptides to VLPs. J. Vis. Exp. (2013)This video demonstrates site-specific fluorescent labeling of mutant virus-like particles (VLPs) produced in Nicotiana benthamiana using a thiol-reactive dye, followed by purification and gel electrophoresis to confirm surface modification.
12:07
Profiling Thiol Redox Proteome Using Isotope Tagging Mass Spectrometry
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Cited by 50 •
2012
Reactive oxygen species level is elevated when cells encounter stress conditions. Here we show the example of 3'-3' diaminobenzidine staining as well as cysTMT labeling and mass spectrometry to profile the redox proteome in Pseudomonas syringae treated tomato leaves.
11:26
High-throughput Gene Tagging in Trypanosoma brucei
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Cited by 21 •
2016
Addition of a tag to a protein is a powerful way of gaining insight into its function. Here, we describe a protocol to endogenously tag hundreds of Trypanosoma brucei proteins in parallel such that genome scale tagging is achievable.
08:14
Analysis of the Solvent Accessibility of Cysteine Residues on Maize rayado fino virus Virus-like Particles Produced in Nicotiana benthamiana Plants and Cross-linking of Peptides to VLPs
0 Views •
Cited by 3 •
2013
A method to analyze the solvent accessibility of the thiol group of cysteine residues of Maize rayado fino virus (MRFV)-virus-like particles (VLPs) followed by a peptide cross-linking reaction is described. The method takes advantage of the availability of several chemical groups on the surface of the VLPs that can be targets for specific reactions.
FAQs
Cysteine-rich tags provide several chemical handles because each cysteine contributes a thiol group. These thiols can participate in disulfide-bond formation, coordinate metal ions, or react selectively with probes and labeling reagents. Consequently, the same tagging strategy can be adapted to create an affinity interaction, generate a detectable signal, or examine where a recombinant protein is located.
Each reaction reports a different type of interaction. Disulfide bonds reflect cysteine-to-cysteine linkage, metal coordination uses thiol-containing residues to associate with metal ions, and selective probe reactions create a chemical labeling route. Choosing among these mechanisms therefore affects whether the tag primarily supports structural investigation, affinity-based isolation, detection, or localization.
The tag adds an engineered set of cysteine side chains whose chemical behavior can be incorporated into experiments on a recombinant protein. Disulfide formation, metal coordination, or selective labeling can provide information connected with the protein’s structure, folding, or interactions. This makes the tag useful when researchers need a defined molecular feature during biochemical analysis.
Yes. Selective reactions with chemical probes or labeling reagents can help detect a tagged protein, while examining its distribution can provide information about cellular localization. These applications answer different biological questions: detection addresses whether the recombinant protein can be identified, whereas localization addresses where it occurs. The tag therefore supports both expression monitoring and spatial analysis.
Researchers attach the tag to a recombinant protein and exploit the chemical behavior of its cysteine residues in an affinity-based procedure. Interactions involving the tag can distinguish the modified protein from other components, supporting its isolation. This application is especially relevant when a study requires purified material for biochemical assays, protein engineering, or further analysis.
Cysteine-rich tags support several complementary areas of biological research, including protein engineering, biochemical assays, imaging, and the development of specialized molecular tools. Their value comes from combining a genetically attached sequence with chemically responsive thiol groups. Depending on the selected reaction, investigators can study protein presence, distribution, purification, structure, folding, or molecular interactions.