The following text describes a protein:
Function:
Plays an essential role in the innate immune response against bacteria, fungi and protozoa infection. After proteolytic cleavage, the protein C-terminus binds covalently through a thioester bond to the pathogen surface resulting in pathogen clearance either by melanization or lysis. Initiate the recruitment and activation of a cascade of proteases, mostly of CLIP-domain serine proteases, which leads to the proteolytic cleavage of the prophenoloxidase (PPO) into active phenoloxidase (PO), the rate-limiting enzyme in melanin biosynthesis (By similarity). In response to parasite P.berghei-mediated infection, binds to and mediates killing of ookinetes, as they egress from midgut epithelial cells into the basal labyrinth, by both lysis and melanization. During bacterial infection, binds to both Gram-positive and Gram-negative bacteria but only promotes phagocytosis of Gram-negative bacteria (By similarity). Promotes the accumulation of SPCLIP1 onto the surface of P.berghei ookinetes and bacterium E.coli which leads to the melanization of the pathogen (By similarity). Recruits CLIPA2 to bacteria surface (By similarity). In response to bacterial infection, required for periostial hemocyte aggregation, but not for the aggregation of sessile hemocytes in non-periostial regions (By similarity). During the late stage of fungus B.bassiana-mediated infection, required for the initiation of hyphae melanization by binding to the surface of hyphae and recruiting prophenoloxidase PPO to them (By similarity). Plays a role in male fertility by binding to defective sperm cells and promoting their removal during spermatogenesis; [Thioester-containing protein 1 allele R1]: Binds to and mediates killing of parasite P.bergei ookinetes by lysis and melanization; [Thioester-containing protein 1 C-terminal]: Binds covalently through a thioester bond to the pathogen surface resulting in pathogen clearance.
Subcellular Localization:
Secreted. Note=Secreted as a full-length protein into the hemolymph.
Sequence:
MWQFIRSRILTVIIFIGAAHGLLVVGPKFIRANQEYTLVISNFNSQLSKVDLLLKLEGETDNGLSVLNVTKMVDVRRNMNRMINFNMPEDLTAGNYKITIDGQRGFSFHKEAELVYLSKSISGLIQVDKPVFKPGDTVNFRVIVLDTELKPPARVKSVYVTIRDPQRNVIRKWSTAKLYAGVFESDLQIAPTPMLGVWNISVEVEGEELVSKTFEVKEYVLSTFDVQVMPSVIPLEEHQAVNLTIEANYHFGKPVQGVAKVELYLDDDKLKLKKELTVYGKGQVELRFDNFAMDADQQDVPVKVSFVEQYTNRTVVKQSQITVYRYAYRVELIKESPQFRPGLPFKCALQFTHHDGTPAKGISGKVEVSDVRFETTTTSDNDGLIKLELQPSEGTEQLSIHFNAVDGFFFYEDVNKVETVTDAYIKLELKSPIKRNKLMRFMVTCTERMTFFVYYVMSKGNIIDAGFMRPNKQPKYLLQLNATEKMIPRAKILIATVAGRTVVYDFADLDFQELRNNFDLSIDEQEIKPGRQIELSMSGRPGAYVGLAAYDKALLLFNKNHDLFWEDIGQVFDGFHAINENEFDIFHSLGLFARTLDDILFDSANEKTGRNALQSGKPIGKLVSYRTNFQESWLWKNVSIGRSGSRKLIEVVPDTTTSWYLTGFSIDPVYGLGIIKKPIQFTTVQPFYIVENLPYSIKRGEAVVLQFTLFNNLGAEYIADVTLYNVANQTEFVGRPNTDLSYTKSVSVPPKVGVPISFLIKARKLGEMAVRVKASIMLGHETDALEKVIRVMPESLVQPRMDTRFFCFDDHKNQTFPINLDINKKADSGSTKIEFRLNPNLLTTVIKNLDHLLGVPTGCGEQNMVKFVPNILVLDYLHAIGSKEQHLIDKATNLLRQGYQNQMRYRQTDGSFGLWETTNGSVFLTAFVGTSMQTAVKYISDIDAAMVEKALDWLASKQHFSGRFDKAGAEYHKEMQGGLRNGVALTSYVLMALLENDIAKAKHAEVIQKGMTYLSNQFGSINNAYDLSIATYAMMLNGHTMKEEALNKLIDMSFIDADKNERFWNTTNPIETTAYALLSFVMAEKYTDGIPVMNWLVNQRYVTGSFPSTQDTFVGLKALTKMAEKISPSRNDYTVQLKYKKSAKYFKINSEQIDVENFVDIPEDTKKLEINVGGIGFGLLEVVYQFNLNLVNFENRFQLDLEKQNTGSDYELRLKVCASYIPQLTDRRSNMALIEVTLPSGYVVDRNPISEQTKVNPIQKTEIRYGGTSVVLYYDNMGSERNCFTLTAYRRFKVALKRPAYVVVYDYYNTNLNAIKVYEVDKQNLCEICDEEDCPAEC