an aliphatic amine + H2O + O2 = an aldehyde + H2O2 + NH4(+) Binds 1 copper ion per subunit. Binds 1 Mn(2+) ion per subunit. Contains 1 topaquinone per subunit. Homodimer. Topaquinone (TPQ) is generated by copper-dependent autoxidation of a specific tyrosyl residue. Belongs to the copper/topaquinone oxidase family. The predicted gene At1g31670 has been split into 2 genes: At1g31670 and At1g31672. The predicted gene At1g31670 has been split into 2 genes: At1g31670 and At1g31672.