Cysteine Scanning Mutagenesis
Cysteine Scanning Mutagenesis - 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.
13:18
Single Oocyte Bisulfite Mutagenesis
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Cited by 14 •
2012
Bisulfite mutagenesis is the gold standard for analyzing DNA methylation. Our modified protocol allows for DNA methylation analysis at the single-cell level and was specifically designed for individual oocytes. It can also be used for cleavage-stage embryos.
04:51
Optogenetic Random Mutagenesis Using Histone-miniSOG in C. elegans
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Cited by 6 •
2016
Genetically-encoded histone-miniSOG induces genome-wide heritable mutations in a blue light-dependent manner. This mutagenesis method is simple, fast, free of toxic chemicals, and well-suited for forward genetic screening and transgene integration.
10:44
An Introduction to Worm Lab: from Culturing Worms to Mutagenesis
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Cited by 27 •
2011
Screening for mutants with phenotypic defects is a straightforward method for identifying genes that function in a given biological process. In this article we describe how to culture free living worms (e.g., Pristionchus pacificus) in the laboratory and show two different mutagenesis methods, EMS and TMP/UV.
FAQs
Each introduced cysteine contributes a thiol group at a chosen position. Researchers can examine whether that group is accessible to a chemical probe or reacts in a particular protein state. Differences in accessibility or reactivity provide evidence about how residues are positioned within the protein and how local environments change during functional or conformational transitions.
A cysteine replacement can affect more than one protein property, so comparing several outcomes helps separate distinct functional roles. Changes in activity may indicate disruption of an operating region, altered ligand binding can identify interaction sites, and state-dependent conformational effects can reveal residues linked to structural rearrangements. Together, these comparisons strengthen interpretations of individual residue contributions.
When an introduced cysteine participates in disulfide bond formation, the result supplies structural information about the engineered position and its relationship to other parts of the protein. Mapping such behavior across selected residues can help researchers infer the arrangement of protein domains and refine models of how those regions are organized.
Researchers first select residues or regions for systematic replacement and introduce cysteine at defined positions. They then examine the resulting protein using chemical probes or tests of reactivity, accessibility, disulfide bond formation, activity, ligand binding, conformational change, or membrane transport. Comparing these measurements across substitutions identifies positions associated with structural or functional effects.
Membrane proteins and ion channels often depend on precise residue placement and conformational changes to support transport or channel function. Introducing cysteine at multiple positions creates a set of defined chemical and functional reporters. Their accessibility, reactivity, and effects on transport can help map functional regions and evaluate mechanistic models for membrane-protein operation.
Patterns in activity, ligand binding, conformational behavior, transport, probe reactivity, or disulfide formation identify residues that influence specific protein properties. Researchers can use these findings to locate functional regions, assess proposed domain arrangements, and select positions for targeted mutations or engineered proteins. The method therefore connects residue-level measurements with broader design decisions.