Phenylalanine/tyrosine ammonia-lyase

Phenylalanine/tyrosine ammonia-lyase (EC 4.3.1.25, PTAL, bifunctional PAL) is an enzyme with systematic name  L -phenylalanine(or L -tyrosine):trans-cinnamate(or trans-p-hydroxycinnamate) ammonia-lyase. This enzyme catalyses the following chemical reaction


 * (1) L -phenylalanine $$\rightleftharpoons$$ trans-cinnamate + NH3
 * (2) L - tyrosine $$\rightleftharpoons$$ trans-p-hydroxycinnamate + NH3

This enzyme is a member of the aromatic amino acid lyase family.