cysteine

cysteine
cysteinic, adj.
/sis"tee een', -in/, n. Biochem.
a crystalline amino acid, C3H7O2NS, a component of nearly all proteins, obtained by the reduction of cystine. Abbr.: Cys; Symbol: C
[1880-85; alter. of CYSTINE]

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Sulfur-containing nonessential amino acid.

In peptides and proteins, the sulfur atoms of two cysteine molecules are bonded to each other to make cystine, another amino acid. The bonded sulfur atoms form a disulfide bridge, a principal factor in the shape and function of skeletal and connective tissue proteins and in the great stability of structural proteins such as keratin.

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Universalium. 2010.

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