The Role of S—S Groups in Proteins
The disulfide group is the most widespread of the covalent bonds in proteins that can link different parts of a polypeptide chain or different chains, and can thus play a part in maintaining the secondary, tertiary, and quaternary structures of proteins. The restriction of rotation around S—S bonds gives to the proteins that contain them an added rigidity in their macrostructure. Disulfide bonds are mainly found in extracellular proteins.
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