Function
In higher plants aldehyde oxidases (AO) appear to be homo- and heterodimeric assemblies of AO subunits with probably different physiological functions. AO-alpha may be involved in the biosynthesis of auxin, and in biosynthesis of abscisic acid (ABA) in seeds. In vitro, AO-alpha uses heptaldehyde, protocatechualdehyde, benzaldehyde, indole-3-aldehyde (IAld), indole-3-acetaldehyde (IAAld), cinnamaldehyde and citral as substrates; AO-beta uses IAAld, IAld and naphtaldehyde as substrates.
Sequence
MGEKAIDEDKVEAMKSSKTSLVFAINGQRFELELSSIDPSTTLVDFLRNKTPFKSVKLGCGEGGCGACVVLLSKYDPLLEKVDEFTISSCLTLLCSIDGCSITTSDGLGNSRVGFHAVHERIAGFHATQCGFCTPGMSVSMFSALLNADKSHPPPRSGFSNLTAVEAEKAVSGNLCRCTGYRPLVDACKSFAADVDIEDLGFNAFCKKGENRDEVLRRLPCYDHTSSHVCTFPEFLKKEIKNDMSLHSRKYRWSSPVSVSELQGLLEVENGLSVKLVAGNTSTGYYKEEKERKYERFIDIRKIPEFTMVRSDEKGVELGACVTISKAIEVLREEKNVSVLAKIATHMEKIANRFVRNTGTIGGNIMMAQRKQFPSDLATILVAAQATVKIMTSSSSQEQFTLEEFLQQPPLDAKSLLLSLEIPSWHSAKKNGSSEDSILLFETYRAAPRPLGNALAFLNAAFSAEVTEALDGIVVNDCQLVFGAYGTKHAHRAKKVEEFLTGKVISDEVLMEAISLLKDEIVPDKGTSNPGYRSSLAVTFLFEFFGSLTKKNAKTTNGWLNGGCKEIGFDQNVESLKPEAMLSSAQQIVENQEHSPVGKGITKAGACLQASGEAVYVDDIPAPENCLYGAFIYSTMPLARIKGIRFKQNRVPEGVLGIITYKDIPKGGQNIGTNGFFTSDLLFAEEVTHCAGQIIAFLVADSQKHADIAANLVVIDYDTKDLKPPILSLEEAVENFSLFEVPPPLRGYPVGDITKGMDEAEHKILGSKISFGSQYFFYMETQTALAVPDEDNCMVVYSSTQTPEFVHQTIAGCLGVPENNVRVITRRVGGGFGGKAVKSMPVAAACALAASKMQRPVRTYVNRKTDMITTGGRHPMKVTYSVGFKSNGKITALDVEVLLDAGLTEDISPLMPKGIQGALMKYDWGALSFNVKVCKTNTVSRTALRAPGDVQGSYIGEAIIEKVASYLSVDVDEIRKVNLHTYESLRLFHSAKAGEFSEYTLPLLWDRIDEFSGFNKRRKVVEEFNASNKWRKRGISRVPAVYAVNMRSTPGRVSVLGDGSIVVEVQGIEIGQGLWTKVKQMAAYSLGLIQCGTTSDELLKKIRVIQSDTLSMVQGSMTAGSTTSEASSEAVRICCDGLVERLLPVKTALVEQTGGPVTWDSLISQAYQQSINMSVSSKYMPDSTGEYLNYGIAASEVEVNVLTGETTILRTDIIYDCGKSLNPAVDLGQIEGAFVQGLGFFMLEEFLMNSDGLVVTDSTWTYKIPTVDTIPRQFNVEILNSGQHKNRVLSSKASGEPPLLLAASVHCAVRAAVKEARKQILSWNSNKQGTDMYFELPVPATMPIVKEFCGLDVVEKYLEWKIQQRKNV