Catalyzes an oxidative deamination of basic, hydrophobic and aromatic L-amino acids, thus producing hydrogen peroxide that may contribute to the diverse toxic effects of this enzyme (Ref.1). Is active on most L-amino acid (39 on 43 tested) with the exception of L-Thr, L-Pro, and L-Gly (Ref.1). an L-alpha-amino acid + H2O + O2 = a 2-oxocarboxylate + H2O2 + NH4(+) H2O + L-asparagine + O2 = 2-oxosuccinamate + H2O2 + NH4(+) H2O + L-methionine + O2 = 4-methylsulfanyl-2-oxobutanoate + H2O2 + NH4(+) H2O + L-phenylalanine + O2 = 3-phenylpyruvate + H2O2 + NH4(+) H2O + L-tyrosine + O2 = 3-(4-hydroxyphenyl)pyruvate + H2O2 + NH4(+) H2O + L-glutamine + O2 = 2-oxoglutaramate + H2O2 + NH4(+) H2O + L-alanine + O2 = H2O2 + NH4(+) + pyruvate H2O + L-leucine + O2 = 4-methyl-2-oxopentanoate + H2O2 + NH4(+) H2O + L-lysine + O2 = 6-amino-2-oxohexanoate + H2O2 + NH4(+) H2O + L-arginine + O2 = 5-guanidino-2-oxopentanoate + H2O2 + NH4(+) H2O + L-glutamate + O2 = 2-oxoglutarate + H2O2 + NH4(+) H2O + L-cystine + O2 = (2R)-2-amino-2-carboxylatoethyl-disulfanyl-oxopropanoate + H2O2 + NH4(+) H2O + L-serine + O2 = 3-hydroxypyruvate + H2O2 + NH4(+) Binds 1 FAD per subunit. Optimum pH is 8-9. Homodimer; non-covalently linked. Unexpectedly, is not secreted into the medium. Predicted to be exported by the Tat system. Not glycosylated. Can be used for the preparation of D-amino acids by resolving racemic amino acid mixtures and for the production of alpha-keto acids. Belongs to the flavin monoamine oxidase family. FIG1 subfamily.