Cystathionine

Cystathionine
IUPAC name 2-amino-4-(2-amino-2-carboxy-ethyl) thio-butanoic acid
Other names L-Cystathionine; S-[(2R)-2-Amino-2-carboxyethyl]-L-homocysteine
Identifiers
CAS number	56-88-2 Y
PubChem	834
ChemSpider	811 Y
KEGG	C00542 Y
MeSH	Cystathionine
ChEBI	CHEBI:17755 Y
ChEMBL	CHEMBL209241 Y
Jmol-3D images	Image 1
SMILES O=C(O)C(N)CSCCC(C(=O)O)N
InChI 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) Y Key: ILRYLPWNYFXEMH-UHFFFAOYSA-N Y 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
Y (verify) (what is: Y/N?) 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.