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L-cysteate sulfo-lyase

In enzymology, a L-cysteate sulfo-lyase is an enzyme that catalyzes the chemical reaction

L-cysteate + H2O rightleftharpoons pyruvate + bisulfite + NH3

Thus, the two substrates of this enzyme are L-cysteate and H2O, whereas its 3 products are pyruvate, bisulfite, and NH3.

This enzyme belongs to the family of lyases, specifically the class of carbon-sulfur lyases. The systematic name of this enzyme class is L-cysteate bisulfite-lyase (deaminating; pyruvate-forming). Other names in common use include L-cysteate sulfo-lyase (deaminating), and CuyA.


  • Denger K, Smits TH, Cook AM "L-cysteate sulpho-lyase, a widespread pyridoxal 5'-phosphate-coupled desulphonative enzyme purified from Silicibacter pomeroyi DSS-3(T)". Biochem. J. 394 657–64.

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