CYS

CYSTEINE

CYS is found in 97730 entries

CYS in polymers: 97648 entries. Examples include: 102L, 103L, 104L

CYS as free ligands, exist in 82 entries. Examples include 1B23, 1D7P, 1ECX

Find related ligands: Stereoisomers Similar ligands Chemical Structure Search

View summary at Ligand Expo

Chemical Component Summary

Name CYSTEINE
Identifiers L-cysteine
(2R)-2-amino-3-sulfanyl-propanoic acid
Formula C3 H7 N O2 S
Molecular Weight 121.16 g/mol
Type L-peptide linking
Isomeric SMILES N[C@@H](CS)C(O)=O
InChI InChI=1S/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)/t2-/m0/s1
InChI Key XUJNEKJLAYXESH-REOHCLBHSA-N

Chemical Details

Formal Charge 0
Atom Count 14
Chiral Atom Count 1
Chiral Atoms CA
Bond Count 13
Aromatic Bond Count 0
Leaving Atoms OXT H2 HXT

Drug Info: DrugBank

DrugBank ID DB00151   (Different stereochemistry)
Name L-Cysteine
Groups
  • approved
  • nutraceutical
Description A thiol-containing non-essential amino acid that is oxidized to form cystine. [PubChem]
Synonyms
  • (2R)-2-amino-3-mercaptopropanoic acid
  • (2R)-2-amino-3-sulfanylpropanoic acid
  • (R)-2-Amino-3-mercaptopropanoic acid
  • Cys
  • L-2-Amino-3-mercaptopropionic acid
  • L-Cys
[more]
Brand Names
  • Aminoderm Poudre
  • Vamin 18 Electrolyte-free
Affected Organism Humans and other mammals
Indication For the prevention of liver damage and kidney damage associated with overdoses of acetaminophen
Pharmacology Due to this ability to undergo redox reactions, cysteine has antioxidant properties. Cysteine is an important source of sulfur in human metabolism, and although it is classified as a non-essential amino acid, cysteine may be essential for infants, the elderly, and individuals with certain metabolic disease or who suffer from malabsorption syndromes. Cysteine may at some point be recognized as an essential or conditionally essential amino acid.
Mechanism of action Although classified as a non-essential amino acid cysteine may be essential for infants, the elderly, and individuals with certain metabolic disease or who suffer from malabsorption syndromes. Cysteine can usually be synthesized by the human body under normal physiological conditions if a sufficient quantity of methionine is available. Due to the ability of thiols to undergo redox reactions, cysteine has antioxidant properties. Cysteine's antioxidant properties are typically expressed in the tripeptide glutathione, which occurs in humans as well as other organisms. The systemic availability of oral glutathione (GSH) is negligible; so it must be biosynthesized from its constituent amino acids, cysteine, glycine, and glutamic acid. Glutamic acid and glycine are readily available in the diets of most industrialized countries, but the availability of cysteine can be the limiting substrate. Cysteine is also an important source of sulfide in human metabolism. The sulfide in iron-sulfur clusters and in nitrogenase is extracted from cysteine, which is converted to alanine in the process. In a 1994 report released by five top cigarette companies, cysteine is one of the 599 additives to cigarettes. Its use or purpose, however, is unknown, like most cigarette additives. Its inclusion in cigarettes could offer two benefits: Acting as an expectorant, since smoking increases mucus production in the lungs; and increasing the beneficial antioxidant glutathione (which is diminished in smokers).
Route of administration
  • intravenous
  • topical
Categories
  • Dietary Supplements
  • Nutritional Support
  • Supplements
CAS number 52-90-4
Drug Info/Drug Targets: DrugBank 3.0: a comprehensive resource for 'omics' research on drugs. Knox C, Law V, Jewison T, Liu P, Ly S, Frolkis A, Pon A, Banco K, Mak C, Neveu V, Djoumbou Y, Eisner R, Guo AC, Wishart DS. Nucleic Acids Res. 2011 Jan; 39 (Database issue):D1035-41. | PMID: 21059682