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Record Information
Version2.0
Created at2005-11-16 15:48:42 UTC
Updated at2021-10-07 20:38:38 UTC
NP-MRD IDNP0001012
Secondary Accession NumbersNone
Natural Product Identification
Common NameL-Cystine
DescriptionCystine is an oxidized dimeric form of cysteine. It is formed by linking two cysteine residues via a disulfide bond (Cys-S-S-Cys) between the -SH groups. Cystine is found in high concentrations in digestive enzymes and in the cells of the immune system, skeletal and connective tissues, skin, and hair. Hair and skin are 10-14% cystine. Cystine is the preferred form of cysteine for the synthesis of glutathione in cells involved in the immune system (e.G. Macrophages and astrocytes). Lymphocytes and neurons prefer cysteine for glutathione production. Optimizing glutathione levels in macrophages and astrocytes with cystine allows these cells to provide cysteine to lymphocytes and neurons directly upon demand (Wikipedia).
Structure
Thumb
Synonyms
Chemical FormulaC6H12N2O4S2
Average Mass240.3000 Da
Monoisotopic Mass240.02385 Da
IUPAC Name(2R)-2-amino-3-{[(2R)-2-amino-2-carboxyethyl]disulfanyl}propanoic acid
Traditional NameL-cystine
CAS Registry Number56-89-3
SMILES
N[C@@H](CSSC[C@H](N)C(O)=O)C(O)=O
InChI Identifier
InChI=1S/C6H12N2O4S2/c7-3(5(9)10)1-13-14-2-4(8)6(11)12/h3-4H,1-2,7-8H2,(H,9,10)(H,11,12)/t3-,4-/m0/s1
InChI KeyLEVWYRKDKASIDU-IMJSIDKUSA-N
Experimental Spectra
Spectrum TypeDescriptionDepositor EmailDepositor OrganizationDepositorDeposition DateView
1D NMR1H NMR Spectrum (1D, 600 MHz, H2O, experimental)Wishart LabWishart LabDavid Wishart2021-06-20View Spectrum
2D NMR[1H, 13C]-HSQC NMR Spectrum (2D, 600 MHz, H2O, experimental)Wishart LabWishart LabDavid Wishart2021-06-20View Spectrum
Predicted Spectra
Not Available
Chemical Shift Submissions
Not Available
Species
Species of Origin
Species Where Detected
Species NameSourceReference
Homo sapiens (Serum)KNApSAcK Database
Homo sapiens (Urine)KNApSAcK Database
Chemical Taxonomy
Description Belongs to the class of organic compounds known as l-cysteine-s-conjugates. L-cysteine-S-conjugates are compounds containing L-cysteine where the thio-group is conjugated.
KingdomOrganic compounds
Super ClassOrganic acids and derivatives
ClassCarboxylic acids and derivatives
Sub ClassAmino acids, peptides, and analogues
Direct ParentL-cysteine-S-conjugates
Alternative Parents
Substituents
  • L-cysteine-s-conjugate
  • Alpha-amino acid
  • L-alpha-amino acid
  • Dicarboxylic acid or derivatives
  • Organic disulfide
  • Dialkyldisulfide
  • Amino acid
  • Sulfenyl compound
  • Carboxylic acid
  • Organopnictogen compound
  • Organic nitrogen compound
  • Primary amine
  • Organosulfur compound
  • Organooxygen compound
  • Organonitrogen compound
  • Primary aliphatic amine
  • Organic oxygen compound
  • Carbonyl group
  • Hydrocarbon derivative
  • Amine
  • Organic oxide
  • Aliphatic acyclic compound
Molecular FrameworkAliphatic acyclic compounds
External Descriptors
Physical Properties
StateSolid
Experimental Properties
PropertyValueReference
Melting Point260.5 °CNot Available
Boiling Point467.00 to 469.00 °C. @ 760.00 mm HgThe Good Scents Company Information System
Water Solubility0.19 mg/mLNot Available
LogP-5.08Chmelík, J., Hudecek, J., Putyera, K., Makovicka, J., Kalous, V., & Chmelíková, J. (1991). Characterization of the hydrophobic properties of amino acids on the basis of their partition and distribution coefficients in the 1-octanol-water system. Collection of Czechoslovak chemical communications, 56(10), 2030-2041.
Predicted Properties
PropertyValueSource
Water Solubility16.8 g/LALOGPS
logP-3.2ALOGPS
logP-5.9ChemAxon
logS-1.2ALOGPS
pKa (Strongest Acidic)1.56ChemAxon
pKa (Strongest Basic)9.34ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count6ChemAxon
Hydrogen Donor Count4ChemAxon
Polar Surface Area126.64 ŲChemAxon
Rotatable Bond Count7ChemAxon
Refractivity54.87 m³·mol⁻¹ChemAxon
Polarizability22.77 ųChemAxon
Number of Rings0ChemAxon
BioavailabilityYesChemAxon
Rule of FiveYesChemAxon
Ghose FilterNoChemAxon
Veber's RuleNoChemAxon
MDDR-like RuleNoChemAxon
HMDB IDHMDB0000192
DrugBank IDDB00138
Phenol Explorer Compound IDNot Available
FoodDB IDFDB012672
KNApSAcK IDC00001352
Chemspider ID60997
KEGG Compound IDC00491
BioCyc IDNot Available
BiGG ID35134
Wikipedia LinkCystine
METLIN ID5207
PubChem Compound67678
PDB IDNot Available
ChEBI ID16283
Good Scents IDrw1253521
References
General References