Cystathionine
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Cystathionine
IUPAC name	2-amino-4-(2-amino-2-carboxy-ethyl) thio-butanoic acid
Identifiers
CAS number	[56-88-2]
PubChem	834
MeSH	Cystathionine
SMILES	C(CSCC(C(=O)O)N)C(C(=O)O)N
Properties
Molecular formula	C7H14N2O4S
Molar mass	222.263 g/mol
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and 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.

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