Cystathionine
From Wikipedia, the free encyclopedia
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Names | |
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IUPAC name
S-((R)-2-amino-2-carboxyethyl)-L-homocysteine
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Other names
L-Cystathionine; S-[(2R)-2-Amino-2-carboxyethyl]-L-homocysteine
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Identifiers | |
56-88-2 ![]() |
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3D model (Jmol) | Interactive image |
ChEBI | CHEBI:17755 ![]() |
ChEMBL | ChEMBL209241 ![]() |
ChemSpider | 388392 ![]() |
ECHA InfoCard | 100.000.269 |
KEGG | C00542 ![]() |
MeSH | Cystathionine |
PubChem | 439258 |
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Properties | |
C7H14N2O4S | |
Molar mass | 222.26 g·mol−1 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references | |
Cystathionine is an intermediate in the synthesis of cysteine.
An excess in the urine is called cystathioninuria.
Biosynthetically, cystathionine is generated from homocysteine and serine by cystathionine beta synthase (upper reaction in the diagram below). It is then cleaved into cysteine and α-ketobutyrate by cystathionine gamma-lyase (lower reaction).
![](http://web.archive.org./web/20161212023637im_/https://upload.wikimedia.org/wikipedia/commons/thumb/b/bf/Cysteine_biosynthesis_unlabeled.svg/350px-Cysteine_biosynthesis_unlabeled.svg.png)
Cysteine metabolism. Cystathionine beta synthase catalyzes the upper reaction and cystathionine gamma-lyase catalyzes the lower reaction.
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