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:22438972). Is moderately active on L-Leu, L-His, and L-Phe, and very weakly active on L-Thr, and L-Cys (PubMed:22438972). Exhibits diverse biological activities, such as hemorrhage, hemolysis, edema, antibacterial and antiparasitic activities, as well as regulation of platelet aggregation. Its effect on platelets is controversial, since it either induces aggregation or inhibits agonist-induced aggregation. These different effects are probably due to different experimental conditions (By similarity). Inhibits growth of B.subtilis strain ATCC 6633 (MIC=32 uM), E.faecalis strain ATCC 12953 (MIC=32 uM), S.aureus strain ATCC 29213 (MIC=32 uM), S.pyogenes strain ATCC 19615 (MIC=8 uM), E.coli strain ATCC 8739 (MIC=4 uM), K.pneumoniae strain ATCC 13885 (MIC=2 uM), P.mirabilis strain ATCC 25933 (MIC=2 uM), P.aeruginosa strain ATCC 15442 (MIC=8 uM) and S.typhimurium strain ATCC 14028 (MIC=8 uM) (PubMed:22438972). 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-histidine + O2 = 3-(imidazol-5-yl)pyruvate + H2O2 + NH4(+) Homodimer; non-covalently linked. Expressed by the venom gland. N-glycosylated. Belongs to the flavin monoamine oxidase family. FIG1 subfamily.