Thiol protease, with a preference for substrates with a large hydrophobic side chain in the P2 position, or with basic residues. Broad endopeptidase specificity. N-glycosylated. N-glycanase treatment does not completely remove carbohydrates, suggesting that the protein contains additional glycosylation sites. Causes an allergic reaction in human. Common symptoms of mite allergy are bronchial asthma, allergic rhinitis and conjunctivitis. Binds to IgE in 80% of patients with house dust allergy. Belongs to the peptidase C1 family.