Crossword clues for cystine
The Collaborative International Dictionary
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.
Wiktionary
n. (context chemistry English) a nonessential amino acid formed by the oxidation of cysteine; it contains two cycteine residues linked by a disulfide bond
WordNet
n. a crystalline amino acid found in proteins (especially keratin); discovered in bladder stones
Wikipedia
Cystine is the oxidized dimer form of the amino acid cysteine and has formula (SCHCH(NH)COH). It is a white solid that is slightly soluble in water. It serves two biological functions, a site of redox reactions and a mechanical linkage that allows proteins to retain their 3-dimensional structure.
Usage examples of "cystine".
The abbreviations for cystine and cysteine are more cryptic and deserve some explanation, for they will be important later on.
Each amino acid portion of cystine can make up part of a separate chain of amino acids.
Similarly, the two amino acid chains, each holding half a cystine molecule, are held together by the S-S combination of the cystine.
Since chemists are often interested in the makeup of a single amino acid chain, they can concentrate on the half of the cystine molecule that is present there.
The molecule was then found to consist of two chains of amino acids held together by cystine molecules after the fashion explained on page 12.
Since most of the abbreviations consist of the first three letters of the name, they are not difficult to memorize: glycine gly alanine ala valine val leucine leu asparagine asp'Ntb aspartic acid asp glutamine ghrNH2 glutamic acid glu THE HUMAN BRAIN isoleucine proline phenylalanine tyrosine tryptophan serine threonine ileu pro phe tyr try ser thr lysine histidine lys his arginine methionine arg met cystine cysteine cy-S-cy-SH Of the abbreviations that are more than the first three letters of the names, ileu, asp-NH2, and ghrNH2 should be clear.
Even here it was moderately strong in cross section-but along the long axis it smeared like graphite, the calcium and sulphur atoms readily changing their minds as to which was to act as the metal of the pair, surrendering their pressure-driven holds on one carbon atom to grab hopefully for the next one in line, or giving up altogether to become incorporated instead in a radical with a self-contained double sulphur bond, rather like cystine.
Even here it was moderately strong in cross sectionbut along the long axis it smeared like graphite, the calcium and sulphur atoms readily changing their minds as to which was to act as the metal of the pair, surrendering their pressure-driven holds on one carbon atom to grab hopefully for the next one in line, or giving up altogether to become incorporated instead in a radical with a self-contained double sulphur bond, rather like cystine.
But it would give a rough percentage composition: so much valine, so much arginine, so much cystine and proline and leucine.