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:16828829). Shows high activity on L-Met, moderate activity on L-Trp, L-Leu, L-His, L-Phe, L-Arg, L-Ile, low activity on L-Val, L-Glu, L-Lys, L-Gln, L-Asn, L-Tyr, L-Ala, and no activity on L-Asp, L-Ser, L-Pro, L-Gly, L-Thr and L-Cys (PubMed:16828829). Shows antimicrobial activity inhibiting the growth of both Gram-negative and Gram-positive bacteria (PubMed:16828829). Also inhibits platelet aggregation induced by ADP or collagen (PubMed:16828829). Effects of snake L-amino oxidases on platelets are controversial, since they either induce aggregation or inhibit agonist-induced aggregation (By similarity). These different effects are probably due to different experimental conditions (By similarity). This protein may also induce hemorrhage, hemolysis, edema, apoptosis, and have antiparasitic activities (By similarity). 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(+) Thermostable between 4 and 25 degrees Celsius. At -20 degrees Celsius, the remaining activity is 20%. Heating at 70 degrees Celsius inactivates the enzyme in 15 minutes. Homodimer; non-covalently linked. Expressed by the venom gland. N-glycosylated. Belongs to the flavin monoamine oxidase family. FIG1 subfamily.