Sf caspase-1 | |||||||
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Sf caspase-1 structure by Ni et al. 2006
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Identifiers | |||||||
Organism | Spodoptera frugiperda (Fall armyworm) | ||||||
Symbol | N/A | ||||||
PDB | 2NN3 | ||||||
RefSeq (mRNA) | U81510.1 | ||||||
RefSeq (Prot) | AAC47442.1 | ||||||
UniProt | P89116 | ||||||
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The protein Sf caspase-1 is the insect ortholog of the human effector caspases CASP3 (CPP32) and CASP7 (MCH3) in the species Spodoptera frugiperda (Fall armyworm).[1][2] It was identified as the target of the baculoviral caspase inhibitor protein P35, which it cleaves and by which it is inhibited.[1] Like other caspases, Sf caspase-1 is an aspartate-specific cysteine protease that is produced as an inactive proenzyme and becomes activated by autocatalytic cleavage.[1] The Sf caspase-1 proenzyme is cleaved after the amino acid residues Asp-28 and Asp-195, resulting in a smaller 12 kDa fragment and a larger 19 kDa fragment.[1][2] Just like with human caspases CASP3 or CASP7, the two cleavage fragments form heterodimers, which again form biologically active dimers-of-heterodimers consisting of two smaller and two larger fragments.[2] Some experiments also showed cleavage of Sf caspase-1 at the residue Asp-184, resulting in an 18 kDa instead of 19 kDa fragment, however this result is likely an in vitro artefact.[2] The insect immunophilin FKBP46 is a substrate of Sf caspase-1, which cleaves full length FKBP46 (~46 kDa) resulting in a ~25 kDa fragment.[1]
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