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It has been suggested that this article or section be merged with Cystathionine-beta-lyase. (Discuss) Proposed since May 2011. cystathionine beta-lyase Identifiers EC number 4.4.1.8 CAS number 9055-05-4 Databases IntEnz IntEnz view BRENDA BRENDA entry ExPASy NiceZyme view KEGG KEGG entry MetaCyc metabolic pathway PRIAM profile PDB structures RCSB PDB PDBe PDBsum Gene Ontology AmiGO / EGO Search PMC articles PubMed articles This article is an orphan, as few or no other articles link to it. Please introduce links to this page from related articles; suggestions may be available. (February 2009) In enzymology, a cystathionine beta-lyase (EC 4.4.1.8) is an enzyme that catalyzes the chemical reaction L-cystathionine + H2O L-homocysteine + NH3 + pyruvate Thus, the two substrates of this enzyme are L-cystathionine and H2O, whereas its 3 products are L-homocysteine, NH3, and pyruvate. This enzyme belongs to the family of lyases, specifically the class of carbon-sulfur lyases. The systematic name of this enzyme class is L-cystathionine L-homocysteine-lyase (deaminating; pyruvate-forming). Other names in common use include beta-cystathionase, cystine lyase, cystathionine L-homocysteine-lyase (deaminating), and L-cystathionine L-homocysteine-lyase (deaminating). This enzyme participates in 5 metabolic pathways: methionine metabolism, cysteine metabolism, selenoamino acid metabolism, nitrogen metabolism, and sulfur metabolism. It employs one cofactor, pyridoxal phosphate. Structural studies As of late 2007, 5 structures have been solved for this class of enzymes, with PDB accession codes 1CL1, 1CL2, 1IBJ, 2FQ6, and 2GQN. References Anderson NW and Thompson JF (1979). "Cystine lyase: beta-cystathionase from turnip roots". Phytochemistry 18: 1953–1958. doi:10.1016/S0031-9422(00)82710-7.  FLAVIN M, SLAUGHTER C (1964). "CYSTATHIONINE CLEAVAGE ENZYMES OF NEUROSPORA". J. Biol. Chem. 239: 2212–9. PMID 14209950.  This lyase article is a stub. You can help Wikipedia by expanding it.v · d · e