CysteineNames IUPAC nameCysteineSystematic IUPAC name2-Amino-3-sulfanylpropanoic acidOther names 2-Amino-3-sulfhydrylpropanoic acid2-Amino-3-mercaptopropanoic acidIdentifiers CAS Number52-90-452-89-1 (hydrochloride)921-01-7 D-cysteine3D model (JSmol)Interactive imageZwitterion: Interactive imageAbbreviations Cys, C ChEBICHEBI:15356ChEMBLChEMBL54943ChemSpider574 (Racemic)5653 (L-form)ECHA InfoCard100.000.145EC Number200-158-2E numberE920 (glazing agents, ...)IUPHAR/BPS4782KEGGD00026PubChemCID5862UNIIK848JZ4886A9U1687S1S (hydrochloride)CompTox Dashboard(EPA)DTXSID8022876InChIInChI=1S/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)Key: XUJNEKJLAYXESH-UHFFFAOYSA-NInChI=1/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)/t2-/m0/s1Key: XUJNEKJLAYXESH-REOHCLBHBUInChI=1/C3H7NO2S/c4-2(1-7)3(5)6/h2,7H,1,4H2,(H,5,6)Key: XUJNEKJLAYXESH-UHFFFAOYACSMILESC([C@@H](C(=O)O)N)SZwitterion: C([C@@H](C(=O)[O-])[NH3+])SProperties Chemical formulaC3H7NO2SMolar mass121.15 g·mol Appearance white crystals or powder Melting point240 °C (464 °F; 513 K) decomposes Solubility in water277g/L (at 25 °C) Solubility1.5g/100g ethanol 19 °C Acidity (pKa) 1.71 (conjugate acid), 8.33 (thiol), 10.78 Chiral rotation ([α]D)+9.4° (H2O, c = 1.3) Supplementary data page Cysteine (data page)Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).Nverify ( ?)
DisulfideIn chemistry, a disulfide (or disulphide in British English) is a compound containing a R−S−S−R′functional group or the S2−2anion. In inorganic chemistry, the anion appears in the common mineral pyrite but is otherwise rare. Compounds of the form R−S−S−H are usually called persulfides instead. Disulfide bridges also appear as a common post-translational modification in proteins.
Amino acidOrganic compounds containing amine and carboxylic groupsStructure of a typical L-alpha-amino acid in the "neutral" formAmino acids are organic compounds that contain both amino and carboxylic acidfunctional groups. Although over 500 amino acids exist in nature, by far the most important are the 22 α-amino acids incorporated into proteins. Only these 22 appear in the genetic code of life.
AmineIn chemistry, amines (, UK also) are organic compounds that contain carbon–nitrogen bonds. Amines are formed when one or more hydrogen atoms in ammonia are replaced by alkyl or aryl groups. The nitrogen atom in an amine possesses a lone pair of electrons. Amines can also exist as heterocyclic compounds. Aniline(C6H7N{\displaystyle {\ce {C6H7N}}}) is the simplest aromatic amine, consisting of a benzene ring bonded to an amino (−NH2{\displaystyle {\ce {-NH2}}}) group.
TautomerIn chemistry, tautomers () are a subset of structural isomers (constitutional isomers) of chemical compounds that readily interconvert. The chemical reaction interconverting the two is called tautomerization. This conversion commonly results from the relocation of a hydrogen atom within the compound. The phenomenon of tautomerization is called tautomerism, also called desmotropism.
William Hyde WollastonWilliam Hyde Wollaston (; 6 August 1766 – 22 December 1828) was an English chemist and physicist who is famous for discovering the chemical elementspalladium and rhodium. He also developed a way to process platinum ore into malleableingots, patented the camera lucida, and made contributions in electricity and spectroscopy. LifeHe was born in East Dereham in Norfolk, the son of the Francis Wollaston (1737–1815), a noted amateur astronomer, and his wife Althea Hyde.
Protein tertiary structureProtein tertiary structure is the three-dimensional shape of a protein. The tertiary structure will have a single polypeptide chain "backbone" with one or more protein secondary structures, the protein domains. Amino acid side chains and the backbone may interact and bond in a number of ways. The interactions and bonds of side chains within a particular protein determine its tertiary structure. The protein tertiary structure is defined by its atomic coordinates.
Horn (anatomy)Look up in Wiktionary, the free dictionary.Chemical formulaA chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus (+) and minus (−) signs. These are limited to a single typographic line of symbols, which may include subscripts and superscripts.
ProteinBiomolecule consisting of chains of amino acid residuesA representation of the 3D structure of the protein myoglobin showing turquoise α-helices. This protein was the first to have its structure solved by X-ray crystallography. Toward the right-center among the coils, a prosthetic group called a heme group (shown in gray) with a bound oxygen molecule (red).Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acidresidues.
RedoxRedox ( , , reduction–oxidation or oxidation–reduction) is a type of chemical reaction in which the oxidation states of the reactants change. Oxidation is the loss of electrons or an increase in the oxidation state. Reduction is the gain of electrons or a decrease in the oxidation state. The oxidation and reduction processes occur simultaneously in the chemical reaction. Redox reactions fall into two classes.*As an Amazon Associate I earn from qualifying purchases.