L-cysteate sulfo-lyase

In enzymology, a L-cysteate sulfo-lyase (EC number|4.4.1.25) is an enzyme that catalyzes the chemical reaction

:L-cysteate + H₂O $ightleftharpoons$ 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.

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