Record Information |
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Version | 2.0 |
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Created at | 2005-11-16 15:48:42 UTC |
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Updated at | 2020-11-24 22:13:59 UTC |
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NP-MRD ID | NP0000245 |
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Secondary Accession Numbers | None |
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Natural Product Identification |
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Common Name | DL-Homocystine |
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Description | Homocystine is the double-bonded form of homocysteine, but it occurs only transiently before being converted to the harmless cystathionine via a vitamin B6-dependent enzyme. Homocystine and homocysteine-cysteine mixed disulfide account for >98% of total homocysteine in plasma from healthy individuals (PMID 11592966 ). Oxidation of low-density lipoprotein (LDL) is thought to be a major factor in the pathophysiology of atherosclerosis. Elevated plasma homocysteine is an accepted risk factor for atherosclerosis, and may act through LDL oxidation, although this is controversial. However, the major thiol in plasma is cysteine, which is present at concentrations approximately 10 times greater than homocysteine; therefore homocystine in plasma is insignificant, and consequently homocystine is unlikely to influence LDL oxidation in vivo (PMID 14732479 ). Increasing evidence supports a role for an elevation of homocysteine in schizophrenia. It has been demonstrated that neural tube defects are related to a genetic defect in homocysteine metabolism. Sufficient intake of folic acid is believed to reduce this risk by enhancing methylation of homocysteine and its conversion to methionine, thereby compensating for this genetic defect (Homocystinuria). Plasma homocysteine levels are elevated when folate levels are in the lower half of the normal range (PMID 16143442 ). Moreover, DL-homocystine is found to be associated with methylenetetrahydrofolate reductase deficiency and methylmalonic acidemia, which are also inborn errors of metabolism. |
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Structure | NC(CCSSCCC(N)C(O)=O)C(O)=O InChI=1S/C8H16N2O4S2/c9-5(7(11)12)1-3-15-16-4-2-6(10)8(13)14/h5-6H,1-4,9-10H2,(H,11,12)(H,13,14) |
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Synonyms | Value | Source |
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4,4'-Dithiobis(2-aminobutyric acid) | ChEBI | Homocystine | Kegg | 4,4'-Dithiobis(2-aminobutyrate) | Generator | 4,4'-Dithiobis | HMDB |
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Chemical Formula | C8H16N2O4S2 |
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Average Mass | 268.3540 Da |
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Monoisotopic Mass | 268.05515 Da |
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IUPAC Name | 2-amino-4-[(3-amino-3-carboxypropyl)disulfanyl]butanoic acid |
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Traditional Name | homocystine |
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CAS Registry Number | 870-93-9 |
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SMILES | NC(CCSSCCC(N)C(O)=O)C(O)=O |
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InChI Identifier | InChI=1S/C8H16N2O4S2/c9-5(7(11)12)1-3-15-16-4-2-6(10)8(13)14/h5-6H,1-4,9-10H2,(H,11,12)(H,13,14) |
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InChI Key | ZTVZLYBCZNMWCF-UHFFFAOYSA-N |
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Experimental Spectra |
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| Spectrum Type | Description | Depositor Email | Depositor Organization | Depositor | Deposition Date | View |
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1D NMR | 1H NMR Spectrum (1D, 600 MHz, H2O, experimental) | Wishart Lab | Wishart Lab | David Wishart | 2021-06-20 | View Spectrum | 2D NMR | [1H, 13C]-HSQC NMR Spectrum (2D, 600 MHz, 5%_DMSO, experimental) | Wishart Lab | Wishart Lab | David Wishart | 2021-06-20 | View Spectrum |
| Predicted Spectra |
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| Not Available | Chemical Shift Submissions |
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| Not Available | Species |
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Species of Origin | |
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Chemical Taxonomy |
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Description | Belongs to the class of organic compounds known as alpha amino acids. These are amino acids in which the amino group is attached to the carbon atom immediately adjacent to the carboxylate group (alpha carbon). |
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Kingdom | Organic compounds |
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Super Class | Organic acids and derivatives |
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Class | Carboxylic acids and derivatives |
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Sub Class | Amino acids, peptides, and analogues |
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Direct Parent | Alpha amino acids |
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Alternative Parents | |
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Substituents | - Alpha-amino acid
- Thia fatty acid
- Dicarboxylic acid or derivatives
- Fatty acid
- Fatty acyl
- Organic disulfide
- Amino acid
- Dialkyldisulfide
- Sulfenyl compound
- Carboxylic acid
- Organic oxide
- Organopnictogen compound
- Primary amine
- Organosulfur compound
- Organooxygen compound
- Organonitrogen compound
- Primary aliphatic amine
- Organic oxygen compound
- Carbonyl group
- Organic nitrogen compound
- Amine
- Hydrocarbon derivative
- Aliphatic acyclic compound
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Molecular Framework | Aliphatic acyclic compounds |
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External Descriptors | |
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Physical Properties |
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State | Solid |
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Experimental Properties | Property | Value | Reference |
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Melting Point | 263 - 265 °C | Not Available | Boiling Point | Not Available | Not Available | Water Solubility | Not Available | Not Available | LogP | Not Available | Not Available |
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Predicted Properties | |
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General References | - Wilcken DE, Gupta VJ: Sulphr containing amino acids in chronic renal failure with particular reference to homocystine and cysteine-homocysteine mixed disulphide. Eur J Clin Invest. 1979 Aug;9(4):301-7. [PubMed:118020 ]
- Sengupta S, Wehbe C, Majors AK, Ketterer ME, DiBello PM, Jacobsen DW: Relative roles of albumin and ceruloplasmin in the formation of homocystine, homocysteine-cysteine-mixed disulfide, and cystine in circulation. J Biol Chem. 2001 Dec 14;276(50):46896-904. Epub 2001 Oct 9. [PubMed:11592966 ]
- Nakano E, Williamson MP, Williams NH, Powers HJ: Copper-mediated LDL oxidation by homocysteine and related compounds depends largely on copper ligation. Biochim Biophys Acta. 2004 Jan 20;1688(1):33-42. [PubMed:14732479 ]
- Brown AS, Susser ES: Homocysteine and schizophrenia: from prenatal to adult life. Prog Neuropsychopharmacol Biol Psychiatry. 2005 Sep;29(7):1175-80. [PubMed:16143442 ]
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