L-cysteate sulfo-lyase

The enzyme  L -cysteate sulfo-lyase (EC 4.4.1.25) catalyzes the reaction


 * L -cysteate + H2O = hydrogensulfite + pyruvate + NH3 (overall reaction)
 * (1a) L -cysteate = hydrogensulfite + 2-aminoprop-2-enoate
 * (1b) 2-aminoprop-2-enoate = 2-iminopropanoate (spontaneous)
 * (1c) 2-iminopropanoate + H2O = pyruvate + NH3 (spontaneous)

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.