Cystathionine gamma-lyase

Cystathionine gamma-lyase
cystathionine gamma-lyase
Cysteine Biosynthesis.png
Cysteine metabolism. Cystathionase catalyzes the lower reaction.
EC number
CAS number 9012-96-8
IntEnz IntEnz view
ExPASy NiceZyme view
MetaCyc metabolic pathway
PRIAM profile
PDB structures RCSB PDB PDBe PDBsum
Gene Ontology AmiGO / EGO

Cystathionine gamma-lyase (or cystathionase) is an enzyme which breaks down cystathionine into cysteine and α-ketobutyrate. Pyridoxal phosphate is a prosthetic group of this enzyme.

Cystathionine gamma-lyase also catalyses the following elimination reactions:

In some bacteria and mammals, including humans, this enzyme takes part in generating hydrogen sulfide.[1]



The following cystathionine gamma-lyase is expressed in humans:

cystathionase (cystathionine gamma-lyase)
Symbol CTH
Entrez 1491
HUGO 2501
OMIM 607657
RefSeq NM_001902
UniProt P32929
Other data
EC number
Locus Chr. 1 p31.1


An deficiency is associated with cystathioninuria.

See also

External links


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