Catalyzes an oxidative deamination of predominantly hydrophobic and aromatic L-amino acids, thus producing hydrogen peroxide that may contribute to the diverse toxic effects of this enzyme (PubMed:16574513). Is highly active on L-Met, L-Leu, L-Phe, L-Ile, and L-Arg, moderately active on L-His, L-Trp, L-Asn, L-Glu, and L-Val, and weakly or not active on L-Gln, L-Lys, L-Asp, L-Ala, L-Tyr, L-Ser, L-Pro, L-Gly, L-Thr, and L-Cys (PubMed:16574513). Exhibits diverse biological activities, such as hemorrhage, hemolysis, edema, apoptosis of vascular endothelial cells or tumor cell lines, antibacterial and antiparasitic activities (By similarity). In addition, this protein has an ability to induce apoptosis in cultured HeLa and K562 cells, and inhibits ADP-induced platelet aggregation dose-dependently. Effects of snake L-amino oxidases on platelets are controversial, since they either induce aggregation or inhibit agonist-induced aggregation. These different effects are probably due to different experimental conditions. an L-alpha-amino acid + H2O + O2 = a 2-oxocarboxylate + H2O2 + NH4(+) H2O + L-leucine + O2 = 4-methyl-2-oxopentanoate + H2O2 + NH4(+) H2O + L-phenylalanine + O2 = 3-phenylpyruvate + H2O2 + NH4(+) H2O + L-tryptophan + O2 = H2O2 + indole-3-pyruvate + NH4(+) H2O + L-methionine + O2 = 4-methylsulfanyl-2-oxobutanoate + H2O2 + NH4(+) H2O + L-isoleucine + O2 = (S)-3-methyl-2-oxopentanoate + H2O2 + NH4(+) H2O + L-arginine + O2 = 5-guanidino-2-oxopentanoate + H2O2 + NH4(+) H2O + L-histidine + O2 = 3-(imidazol-5-yl)pyruvate + H2O2 + NH4(+) H2O + L-asparagine + O2 = 2-oxosuccinamate + H2O2 + NH4(+) H2O + L-valine + O2 = 3-methyl-2-oxobutanoate + H2O2 + NH4(+) H2O + L-glutamate + O2 = 2-oxoglutarate + H2O2 + NH4(+) Homodimer; non-covalently linked. Expressed by the venom gland. N-glycosylated. Belongs to the flavin monoamine oxidase family. FIG1 subfamily.