Catalyzes the conversion of the short chain elongated methionines di-, tri-, and tetrahomomethionine to their respective aldoximes 5-methylthiopentanaldoxime, 6-methylthiohexanaldoxime, and 7-methylheptanaldoxime. an L-polyhomomethionine + 2 O2 + 2 reduced [NADPH--hemoprotein reductase] = an (E)-omega-(methylsulfanyl)-alkanal oxime + CO2 + 2 H(+) + 3 H2O + 2 oxidized [NADPH--hemoprotein reductase] L-dihomomethionine + 2 O2 + 2 reduced [NADPH--hemoprotein reductase] = (E)-5-(methylsulfanyl)pentanal oxime + CO2 + 2 H(+) + 3 H2O + 2 oxidized [NADPH--hemoprotein reductase] L-trihomomethionine + 2 O2 + 2 reduced [NADPH--hemoprotein reductase] = (E)-6-(methylsulfanyl)hexanal oxime + CO2 + 2 H(+) + 3 H2O + 2 oxidized [NADPH--hemoprotein reductase] Highly expressed in cotyledons, leaves, stems and siliques. Detected in flowers and lateral roots, but not in the main root. Expressed only in the vascular bundles in apical plant parts. By methyl jasmonate. Plants have a bushy phenotype with crinkled leaves and retarded vascularization. Belongs to the cytochrome P450 family. Truncated N-terminus.