- Cystathionine
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Cystathionine 
2-amino-4-(2-amino-2-carboxy-ethyl) thio-butanoic acidOther namesL-Cystathionine; S-[(2R)-2-Amino-2-carboxyethyl]-L-homocysteineIdentifiers CAS number 56-88-2 
PubChem 834 ChemSpider 811 KEGG C00542 MeSH Cystathionine ChEBI CHEBI:17755 ChEMBL CHEMBL209241 Jmol-3D images Image 1 - O=C(O)C(N)CSCCC(C(=O)O)N
- InChI=1S/C7H14N2O4S/c8-4(6(10)11)1-2-14-3-5(9)7(12)13/h4-5H,1-3,8-9H2,(H,10,11)(H,12,13)
Key: ILRYLPWNYFXEMH-UHFFFAOYSA-N
InChI=1/C7H14N2O4S/c8-4(6(10)11)1-2-14-3-5(9)7(12)13/h4-5H,1-3,8-9H2,(H,10,11)(H,12,13)
Key: ILRYLPWNYFXEMH-UHFFFAOYAH
Properties Molecular formula C7H14N2O4S Molar mass 222.263 g/mol 
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Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)Infobox references Cystathionine is an intermediate in the synthesis of cysteine.
It is generated from homocysteine and serine by cystathionine beta synthase.
It is cleaved into cysteine and α-ketobutyrate by cystathionine gamma-lyase.
An excess in the urine is called cystathioninuria.
Cysteine metabolism. Cystathionine beta synthase catalyzes the upper reaction and cystathionine gamma-lyase catalyzes the lower reaction.
K→acetyl-CoA G G→pyruvate→citrateG→glutamate→
α-ketoglutarateotherα-Ketoisovaleric acid · Isobutyryl-CoA · Methacrylyl-CoA · 3-Hydroxyisobutyryl-CoA · 3-Hydroxyisobutyric acid · 2-Methyl-3-oxopropanoic acidG→fumarateG→oxaloacetatesee urea cycleOther biochemical families: prot · nucl · carb (glpr, alco, glys) · lipd (fata/i, phld, strd, gllp, eico) · amac/i · ncbs/i · ttpy/iCategories:- Biochemistry stubs
- Sulfur amino acids
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