| disulphide | <chemistry> A binary compound of sulphur containing two atoms of sulphur in each molecule; formerly called disulphuret. Cf. Bisulphide. Origin: Pref. Di- + sulphide. Source: Websters Dictionary (01 Mar 1998) |
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| disulphide bond | <chemistry, molecular biology> The S S linkage. A linkage formed between the SH groups of two cysteine moieties either within or between peptide chains. Each cysteine then becomes a half cystine residue. S S linkages stabilise, but do not determine, secondary structure in proteins. They are easily disrupted by SH groups in an exchange reaction and are not present in cytosolic proteins (cytosol has a high concentration of glutathione that has a free SH residue). (18 Nov 1997) |
| disulphide bridge | <chemistry> A covalent link made by a cystine residue that joins two polypeptide chains. (09 Oct 1997) |