Converts tryptophan to indole-3-acetaldoxime, a precursor for tryptophan-derived glucosinolates and indole-3-acetic acid (IAA) (PubMed:10681464, PubMed:10922360). Involved in the biosynthetic pathway to 4-hydroxyindole-3-carbonyl nitrile (4-OH-ICN), a cyanogenic metabolite required for inducible pathogen defense (PubMed:26352477). L-tryptophan + 2 O2 + 2 reduced [NADPH--hemoprotein reductase] = (E)-(indol-3-yl)acetaldehyde oxime + CO2 + 2 H(+) + 3 H2O + 2 oxidized [NADPH--hemoprotein reductase] Found in all tissues tested. Highest expression in roots, and low expression in stem. Belongs to the cytochrome P450 family.