What is Dihydroxyphenylalanine ammonia-lyase?

In enzymology, a dihydroxyphenylalanine ammonia-lyase is a non-existing enzyme that catalyzes the chemical reaction

Hence, this enzyme has one substrate, 3,4-dihydroxy-L-phenylalanine , and two products, trans-caffeate and NH3.

This enzyme belongs to the family of lyases, specifically ammonia lyases, which cleave carbon-nitrogen bonds. The systematic name of this enzyme class is 3,4-dihydroxy-L-phenylalanine ammonia-lyase. Other names in common use include beta--L-alanine ammonia-lyase, and 3,4-dihydroxy-L-phenylalanine ammonia-lyase. This enzyme participates in tyrosine metabolism.