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Acetylcysteine is the N-acetyl derivative of the amino acid L-cysteine, and is a precursor in the formation of the antioxidant glutathione in the body. The thiol (sulfhydryl) group confers antioxidant effects and is able to reduce free radicals .
Cysteine ball and stick model spinning. Cysteine (/ ˈ s ɪ s t ɪ iː n /; [5] symbol Cys or C [6]) is a semiessential [7] proteinogenic amino acid with the formula HOOC−CH(−NH 2)−CH 2 −SH. The thiol side chain in cysteine enables the formation of disulfide bonds, and often participates in enzymatic reactions as a nucleophile.
Allopregnanolone is a naturally occurring neurosteroid which is made in the body from the hormone progesterone. [10] [11] As a medication, allopregnanolone is referred to as brexanolone, sold under the brand name Zulresso, [6] [12] and used to treat postpartum depression. [11] [13] [14] It is given by injection into a vein. [11] [6]
Cystine is the oxidized derivative of the amino acid cysteine and has the formula (SCH 2 CH(NH 2)CO 2 H) 2.It is a white solid that is poorly soluble in water. As a residue in proteins, cystine serves two functions: a site of redox reactions and a mechanical linkage that allows proteins to retain their three-dimensional structure.
Cystamine (2,2'-dithiobisethanamine) is an organic disulfide.It is formed when cystine is heated, the result of decarboxylation.Cystamine is an unstable liquid and is generally handled as the dihydrochloride salt, C 4 H 12 N 2 S 2 ·2HCl, which is stable to 203-214 °C at which point it decomposes.
It is a homologue of the amino acid cysteine, differing by an additional methylene bridge (-CH 2-). It is biosynthesized from methionine by the removal of its terminal C ε methyl group. In the body, homocysteine can be recycled into methionine or converted into cysteine with the aid of vitamin B 6, B 9, and B 12. [3]
Penicillamine was the second line treatment for arsenic poisoning, after dimercaprol (BAL). [5] It is no longer recommended. [6] In cystinuria, a hereditary disorder in which high urine cystine levels lead to the formation of cystine stones, penicillamine binds with cysteine to yield a mixed disulfide which is more soluble than cystine. [7]
Thiazolidines functionalized with carbonyls at the 2 and 4 positions, the thiazolidinediones, are drugs used in the treatment of diabetes mellitus type 2. Rhodanine is a related bioactive species, featuring one carbonyl and one thiocarbonyl. Many thiazolidines are prepared from cysteine and related aminothiols.