ID 4.1.1.108 DE 4-hydroxyphenylacetaldehyde synthase. CA H(+) + H2O + L-tyrosine + O2 = (4-hydroxyphenyl)acetaldehyde + CO2 + H2O2 CA + NH4(+). CC -!- The enzyme, isolated from the the plant Petroselinum crispum CC (parsley), catalyzes the production of 4-hydroxyphenylacetaldehyde CC directly from L-tyrosine. CC -!- Tyramine is not formed as an intermediate. CC -!- The enzyme has a low activity with L-dopa (cf. EC 4.1.1.107). DR Q06086, HPAAS_PETCR; A0A2I6B3P0, HPAAS_RHORB; //