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disulfide
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Diagram of an antibody molecule showing the Y-shaped structure with labeled variable and constant domains on both light and heavy chains, disulfide bonds holding the folded domains, and antigen-binding sites at the tips. Diagram of an antibody molecule showing two identical light chains and two identical heavy chains joined by disulfide bonds in a Y-shaped structure, with labeled regions for antigen binding and effector function. Diagram of an IgG immunoglobulin showing two heavy chains and two light chains connected by red and green dots representing intra-chain and inter-chain disulfide bonds, with labeled Fab and Fc regions and a note explaining the structure and cleavage points. A simplified diagram of the lysozyme protein from hen's egg white, showing a single blue peptide chain with numbered red dots marking amino acid residues from the N-terminal (1) to the C-terminal (129). Thiols and disulfides
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disulfide

chemical compound
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Diagram of an antibody molecule showing the Y-shaped structure with labeled variable and constant domains on both light and heavy chains, disulfide bonds holding the folded domains, and antigen-binding sites at the tips.
Domains of an antibody Variable (V) and constant (C) domains within the light (L) and heavy (H) chains of an antibody, or immunoglobulin, molecule. The folded shapes of the domains are maintained by disulfide bonds (ā€•Sā€•Sā€•).

A disulfide is a chemical compound containing two sulfur atoms. These can be inorganic or organic, with organic disulfides featuring a divalent group of two sulfur atoms (SS) bonded to organic radicals. A unique property of sulfur is its ability to form chains of sulfur atoms with organic groups at either end, denoted as RSnRā€², where n represents the number of sulfur atoms, with disulfides having n=2.12

Disulfides play crucial roles in biological systems. For instance, the amino acid cystine, a disulfide, is vital for protein structure and function. The interconversion between cysteine and cystine disulfide groups is important in cell membrane transport, immune responses, and blood clotting. Hair waving processes involve the temporary cleavage and reformation of these disulfide bonds in keratin. Lipoic acid, a cyclic disulfide, acts as a coenzyme involved in various metabolic processes and biological oxidations.2

Disulfides are generally prepared by oxidizing thiols. They can also be reduced back to thiols, a process essential in biochemistry. Disulfides can undergo further oxidation to form sulfoxides, sulfones, and sulfonic acids. Some disulfides are known for their distinct flavors and aromas, contributing to the taste of foods like shiitake mushrooms, beer, and wine, as well as the characteristic smell of garlic.32

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4 Britannica Sources
  1. organosulfur compound - Reactions
  2. organosulfur compound - Preparation
  3. organosulfur compound - The sulfur atom
  4. disulfide

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