Function
Serine protease which, by cleaving and activating prophenoloxidase (PPO1) after immune challenge, plays an essential role in the melanization immune response to septic wounding (PubMed:16256951, PubMed:16322759, PubMed:19071960, PubMed:24260243, PubMed:16861233). May function in diverse Hayan-dependent PPO1-activating cascades that are negatively controlled by different serpin proteins; Spn27A in the hemolymph and Spn77BA in the trachea (PubMed:18854145, PubMed:24260243, PubMed:16322759). Important for the innate immune response to fungi (PubMed:16861233). Regulation of melanization and PPO1 activation appears to be largely independent of the Toll signaling pathway (PubMed:16861233).
Sequence
MKSTRKVVGIFLATCLLPFTVLQNVAAQGSCRNPNQKQGQCLSIYDCQSLLSVIQQSYVSPEDRTFLRNSQCLDGVGRQPYVCCTSDRSFGSQEATSAAPPPTTTSSSSRGQDGQAGLGNLLPSPPKCGPHSFSNKVYNGNDTAIDEFNWMALLEYVDNRGRRELSCGGSLINNRYVLTAAHCVIGAVETEVGHLTTVRLGEYDTSKDVDCIDDICNQPILQLGIEQATVHPQYDPANKNRIHDIALLRLDRPVVLNEYIQPVCLPLVSTRMAINTGELLVVSGWGRTTTARKSTIKQRLDLPVNDHDYCARKFATRNIHLISSQLCVGGEFYRDSCDGDSGGPLMRRGFDQAWYQEGVVSFGNRCGLEGWPGVYTRVADYMDWIVETIRP