Secreted alkaline protease that allows assimilation of proteinaceous substrates. Acts as a significant virulence factor in invasive aspergillosis. Involved in immune evasion from the human and mice complement systems during infection. Efficiently cleaves important components of the complement cascade such as such as C3, C4, C5, and C1q, as well as IgG, which leads to down-regulation of complement activation at the hyphal surface. Hydrolysis of proteins with broad specificity, and of Bz-Arg-OEt > Ac-Tyr-OEt. Does not hydrolyze peptide amides. Optimum pH is 7-8. Expression is controlled by the prtT transcription factor. Causes an allergic reaction in human. Binds to IgE via three immunodominant epitopes localized at the C-terminal part. Belongs to the peptidase S8 family.