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Cysteine (symbol Cys or C; [5] / ˈ s ɪ s t ɪ iː n /) [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. Cysteine is chiral, but both D and L-cysteine ...
Purified chymopapain is the main component of the injection, composed basically of 20 mg in five millilitres. It is provided in vials containing 10.000 units of the lyophilized agent with 0.37 mg of disodium edetate, [26] 3.5 mg of cysteine hydrochloride monohydrate and 1.0 mg of bisulfide. All of them work as stabilisers and activators.
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.
Small amounts of hydrogen chloride for laboratory use can be generated in an HCl generator by dehydrating hydrochloric acid with either sulfuric acid or anhydrous calcium chloride. Alternatively, HCl can be generated by the reaction of sulfuric acid with sodium chloride: [17] NaCl + H 2 SO 4 → NaHSO 4 + HCl↑. This reaction occurs at room ...
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.
Papain-like proteases share a common catalytic dyad active site featuring a cysteine amino acid residue that acts as a nucleophile. [1] The human genome encodes eleven cysteine cathepsins which have a broad range of physiological functions. [3] In some parasites papain-like proteases have roles in host invasion, such as cruzipain from ...
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Cysteamine is an organosulfur compound with the formula HSCH 2 CH 2 NH 2.A white, water-soluble solid, it contains both an amine and a thiol functional groups. It is often used as salts of the ammonium derivative [HSCH 2 CH 2 NH 3] + [12] including the hydrochloride, phosphocysteamine, and the bitartrate. [13]
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