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:18294891). Is highly active on L-Met, L-Leu, L-Phe, L-Trp, and L-Arg, and no weakly or no active on L-His, L-Tyr, L-Ile, L-Gln, and L-Lys (PubMed:18294891). Exhibits diverse biological activities, such as antibacterial activity against both Gram-positive (B.subtilis) and Gram-negative (E.coli) bacteria, and inhibition of ADP- or collagen-induced platelet aggregation. 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. This protein may also induce hemorrhage, hemolysis, edema, apoptosis, and have antiparasitic activities. 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-arginine + O2 = 5-guanidino-2-oxopentanoate + H2O2 + NH4(+) Homodimer; non-covalently linked. Expressed by the venom gland. N-glycosylated. Belongs to the flavin monoamine oxidase family. FIG1 subfamily.