Catalyzes both the decarboxylation and deamination of L-dopa to 3,4-dihydroxylphenylacetaldehyde (DHPAA) (By similarity). Probably responsible for the protein cross-linking during the development of flexible cuticles (By similarity). Participates in catecholamine catabolism (By similarity). H(+) + H2O + L-dopa + O2 = 3,4-dihydroxyphenylacetaldehyde + CO2 + H2O2 + NH4(+) Belongs to the group II decarboxylase family.