Definition of Cystine

1. Noun. A crystalline amino acid found in proteins (especially keratin); discovered in bladder stones.

Generic synonyms: Amino Acid, Aminoalkanoic Acid

Definition of Cystine

1. n. A white crystalline substance, C3H7NSO2, containing sulphur, occuring as a constituent of certain rare urinary calculi, and occasionally found as a sediment in urine.

Definition of Cystine

1. Noun. (chemistry) a nonessential amino acid formed by the oxidation of cysteine; it contains two cycteine residues linked by a disulfide bond ¹

¹ Source:

Definition of Cystine

1. an amino acid [n -S]

Medical Definition of Cystine

1. The amino acid formed by linking two cysteine residues with a disulphide linkage between the two SH groups. The analagous compound present within proteins is termed two half cysteines. This entry appears with permission from the Dictionary of Cell and Molecular Biology (11 Mar 2008)

Cystine Pictures

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Lexicographical Neighbors of Cystine

cysticercus disease
cystine (current term)
cystine bridge
cystine calculus
cystine desulfhydrase
cystine disease
cystine lyase
cystine storage disease
cystinotic leukocyte

Literary usage of Cystine

Below you will find example usage of this term as found in modern and/or classical literature:

1. The Chemical Constitution of the Proteins by Robert Henry Aders Plimmer (1917)
"(2) Separation of cystine and Tyrosine. The mixture of cystine and tyrosine was separated by Morner by fractional crystallisation from ammonia; ..."

2. Journal of the American Chemical Society by American Chemical Society (1879)
"In addition to the twofold reduction in the value of [0]„t relative to that for cystine, the position of the extremum had been shifted by 10 to 262 тц. ..."

3. Chemical Pathology: Being a Discussion of General Pathology from the by Harry Gideon Wells (1914)
"The view now prevalent is that the cystine that escapes in the urine in cystinuria is not derived from ... Literature concerning cystine given by Friedmann. ..."

4. A Dictionary of Applied Chemistry by Thomas Edward Thorpe (1921)
"1910, 8, 9), cystine is most readily prepared from wool by boiling it in a reflux apparatus for 5-6 hours with twice its weight of strong hydrochloric acid, ..."

5. Science by American Association for the Advancement of Science (1922)
"Many authors agree that the amino acid, cystine, is destroyed by acid ... In the present study a large quantity of cystine was boiled with 20 per cent, ..."

6. A Practical treatise on urinary and renal diseases including urinary by William Roberts (1872)
"cystine or cystic oxide is a crystalline body of great rarity, ... cystine was discovered by "Wollaston in 1805, in a urinary calculus which was mainly ..."

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