Disulfide Formation
Disulfide Formation - Related Videos
03:51
Fluorescent Functionalization of Virus-Like Particles via Disulfide Re-bridging
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2026
Source: Chen, Z., et al. Making Conjugation-induced Fluorescent PEGylated Virus-like Particles by Dibromomaleimide-disulfide Chemistry. J. Vis. Exp. (2018)This video demonstrates the fluorescent functionalization of virus-like particles by re-bridging reduced disulfides with a polyethylene glycol (PEG) linker, producing stable, trackable conjugates suitable for cellular imaging and targeted delivery in biomedical applications.
10:18
Making Conjugation-induced Fluorescent PEGylated Virus-like Particles by Dibromomaleimide-disulfide Chemistry
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Cited by 12 •
2018
Here, we present a procedure to fluorescently functionalize the disulfides on Qβ VLP with dibromomaleimide. We describe Qβ expression and purification, the synthesis of dibromomaleimide-functionalized molecules, and the conjugation reaction between dibromomaleimide and Qβ. The resulting yellow fluorescent conjugated particle can be used as a fluorescence probe inside cells.
02:44
Non-Reducing SDS PAGE: A Method to Analyze Disulfide-Linked Multimeric Protein Complexes
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2025
This video describes the technique of separating the protein samples by non-reducing SDS-PAGE to analyze the multimeric protein complexes. This technique retains the multimer subunits of a protein held by the disulfide bonds which can later be analyzed by western blotting.
12:05
Production of Disulfide-stabilized Transmembrane Peptide Complexes for Structural Studies
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Cited by 7 •
2013
Biophysical and biochemical studies of interactions among membrane-embedded protein domains face many technical challenges, the first of which is obtaining appropriate study material. This article describes a protocol for producing and purifying disulfide-stabilized transmembrane peptide complexes that are suitable for structural analysis by solution nuclear magnetic resonance (NMR) and other analytical applications.
12:16
High Throughput Quantitative Expression Screening and Purification Applied to Recombinant Disulfide-rich Venom Proteins Produced in E. coli
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Cited by 29 •
2014
A protocol for the quantitative, high throughput expression screening and analytical purification of fusion proteins from small-scale Escherichia coli cultures is described and applied to the expression of disulfide-rich animal venom protein targets.
FAQs
Oxidation of two thiol groups removes hydrogen and electrons from the sulfur-containing reactants. The sulfur atoms then form an S–S linkage, while protons are released into the surrounding chemical environment. This electron and proton balance explains why the process belongs to redox chemistry and provides a basis for controlling bond formation in molecular and biochemical systems.
The two participating thiol groups may belong to separate sulfur-containing molecules or to different parts of the same molecule. Consequently, the new disulfide linkage can join molecular partners or create an internal connection. In proteins, internal links between cysteine residues help organize the molecule’s structure, whereas links between molecules can produce larger connected species.
Disulfide bonds are not necessarily permanent structural features because reducing conditions can reverse their formation. Reduction breaks the sulfur-sulfur connection and restores thiol groups, while oxidation favors the linked form. This reversibility allows chemists and biochemists to alter molecular connectivity, adjust protein shape, and investigate how redox changes influence molecular function.
The chemical environment determines whether sulfur-containing groups remain as thiols or become connected through a disulfide bond. Oxidizing conditions support bond formation by removing hydrogen and electrons, whereas reducing conditions drive the reverse change. Controlling this balance is therefore important when a defined molecular shape, connectivity, stability, or reactivity is required.
A practical sequence begins by identifying the relevant thiol groups and determining whether the desired product requires their connection or separation. Oxidation can then be used to generate the disulfide-linked form, while reducing conditions can return the system to thiols. This reversible sequence supports deliberate control of molecular structure rather than treating bond formation as irreversible.
The process supports several research activities, including protein purification, peptide synthesis, and redox studies. It also helps researchers design biomolecules with defined stability and reactivity. In protein systems, controlling connections between cysteine residues can stabilize molecular structures or change their shapes, providing a chemical route for studying relationships between structure and function.