cystathionine beta-lyase EC#: 4.4.1.8; ChemWhat Code: 1382909
| Product Name | cystathionine beta-lyase |
| Example Structure |  |
| Synonyms | beta-lyase, LACBS_00576, MalY, patB |
| EC Number | 4.4.1.8 |
| CAS Registry Number | 9055/5/4 |
| Comments | A pyridoxal-phosphate protein. The enzyme cleaves a carbon-sulfur bond, releasing?L-homocysteine and an unstable enamine product that tautomerizes to an imine form, which undergoes a hydrolytic deamination to form pyruvate and ammonia. The latter reaction, which can occur spontaneously, can also be catalysed by EC?3.5.99.10, 2-iminobutanoate/2-iminopropanoate deaminase. The enzyme from some sources also acts on?L-cystine, forming pyruvate, ammonia and cysteine persulfide, and a number of related compounds. Possibly identical, in yeast, with EC?4.4.1.6?S-alkylcysteine lyase. |
| Cofactor | pyridoxal 5′-phosphate |
| History | transferred to EC 4.4.1.13 |
| Reactions | L-cystathionine + H(2)O = L-homocysteine + NH(3) + pyruvate. |
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