Catalyzes the oxidation of aldehydes to the corresponding carboxylate by coupling the reaction to the reduction of dioxygen to hydrogen peroxide. Substrates include glyoxal and other aldehydes (Probable). Does not have enzymatic activity on D-galactose (PubMed:29220102). an aldehyde + H2O + O2 = a carboxylate + H(+) + H2O2 Localized around nucleus. Expressed in pollen (at protein level). The N-terminus is blocked. Glycosylated. The measured mass is that of the mature protein. Causes an allergic reaction in human. Binds to IgE of patients allergic to mugwort pollen (PubMed:29220102, PubMed:30155917). The natural protein binds to IgE in 94% and 95% of the 113 Chinese and 20 Dutch patients tested, respectively. The natural protein gives a positive reaction in 50% of the 14 Chinese patients tested by intradermal skin testing. All except one of these positives are also positive by ImmunoCAP test. The recombinant protein binds to IgE in 4% and 50% of the 54 Chinese and 20 Dutch patients tested, respectively. The lack of IgE-binding to the recombinant protein is not due to the absence of cross-reactive carbohydrate determinants (CCD), although in a subset of (Dutch) sera CCD does seem to play a role in the IgE recognition (PubMed:29220102). Binds to IgE in 80% of the 240 Chinese patients tested. Adult group has a significantly lower IgE level than the child and teenager group. The patients from Southwestern China have significantly lower frequency of sensitization and lower IgE levels against this protein than the patients from Northern China. Patients allergic to multiple Artemisia allergens, including Art an 7, Art v 1 and Art v 3, have a higher risk of developing allergic asthma (PubMed:30155917).