/sis"teen, -tin/, n. Biochem.
a crystalline amino acid, C6H12O4N2S2, occurring in most proteins, esp. the keratins in hair, wool, and horn, and yielding cysteine on reduction.
[1835-45; CYST- + -INE2; so called because found in the bladder]

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      a crystalline, sulfur-containing amino acid that is formed from two molecules of the amino acid cysteine. Cystine can be converted to cysteine by reduction (in this case, the addition of hydrogen). Discovered in 1810, cystine was not recognized as a component of proteins until 1899, when it was isolated from animal horn. Cystine is particularly abundant in skeletal and connective tissues and in hair, horn, and wool.

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Universalium. 2010.

Look at other dictionaries:

  • cystine — [ sistin ] n. f. • 1834; du gr. kustis « vessie » ♦ Biochim. Forme oxydée de la cystéine faite de deux molécules de cet acide aminé, reliées par leurs atomes de soufre. ● cystine nom féminin Aminoacide soufré, constituant essentiel des protéines …   Encyclopédie Universelle

  • Cystine — Général No CAS …   Wikipédia en Français

  • Cystine — Cyst ine (s?s t?n; 104), n. [See {Cyst}.] (Physiol. Chem.) A white crystalline substance, {C3H7NSO2}, containing sulphur, occuring as a constituent of certain rare urinary calculi, and occasionally found as a sediment in urine. [1913 Webster] …   The Collaborative International Dictionary of English

  • cystine — cystine. См. цистин. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • cystine — [sis′tēn, sis′tin] n. [ CYST(O) + INE3: so named from having been found first in urinary calculi] a nonessential amino acid, C4H6 (NH2) 2S2 (COOH) 2: see AMINO ACID …   English World dictionary

  • Cystine — Not to be confused with cysteine. Cystine Identifiers CAS number …   Wikipedia

  • Cystine — An amino acid, one of the 20 amino acids which serve as the building blocks of protein. Cystine is not an essential amino acid, that is, it is not essential to the diet since the body can synthesize (make) it. Cystine is particularly notable… …   Medical dictionary

  • cystine — cistinas statusas T sritis chemija formulė [SCH₂CH(NH₂)COOH]₂ atitikmenys: angl. cystine rus. цистин ryšiai: sinonimas – 3,3ˊ ditio bis(2 aminopropano rūgštis) …   Chemijos terminų aiškinamasis žodynas

  • cystine — noun Etymology: from its discovery in bladder stones Date: 1843 a crystalline amino acid C6H12N2O4S2 that is widespread in proteins (as keratins) and is a major metabolic sulfur source …   New Collegiate Dictionary

  • cystine — The amino acid formed by linking two cysteine residues with a disulphide linkage between the two sulphydryl (SH) groups. The analogous compound present within proteins is termed two half cysteines …   Dictionary of molecular biology

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