cysteinen.
/ˈsɪstiːɪn//ˈsɪstiːʌɪn/ Biochemistry.
An amino-acid, HS·CH2·CH(NH2)·COOH, which is a reduction product of cystine and a constituent of glutathione and many proteins.
ΚΠ
1884 Jrnl. Chem. Soc. 46 A. 1382 Cystine and Cysteïne... The hydrochloride of the new base cysteïne is obtained by evaporating the filtrate.
1923 Nature 24 Feb. 274/1 The reduction of methylene blue by the sulphydryl compounds, reduced glutathione, cystein, and thioglycollic acid, is an autocatalytic reaction.
1961 Lancet 8 July 87/2 Two cysteine molecules readily give up their hydrogen atoms..to reunite as cystine.
1970 R. W. McGilvery Biochemistry xvii. 382 Cystine enters metabolism as cysteine.
This entry has not yet been fully updated (first published 1972; most recently modified version published online December 2020).
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