Spider venom toxin that exhibits cytolytic activity by forming an alpha-helix across the membrane (PubMed:20657014). Lethal to insect larvae (PubMed:20657014, PubMed:24717175). Causes instant paralysis and death in the larvae of the flesh fly (S.carnaria) at doses of 20 ug/g, at doses of less than 10 ug/g causes reversible paralysis (PubMed:20657014). Has cytolytic activity against insect Sf9 cells (PubMed:20657014). Causes stable and irreversible depolarization of fly muscle fibers, leading to contracture at higher toxin concentrations (PubMed:20657014). Destabilizes membranes (PubMed:20657014). Probably forms a transmembrane alpha-helix in the target cell membrane. Expressed by the venom gland. The presence of 'disulfide through disulfide knots' structurally defines this protein as a knottin. This toxin contains 2 'disulfide through disulfide knots' that are separated by a short linker (By similarity). Cleavage of the propeptide depends on the processing quadruplet motif (XXXR, with at least one of X being E). LD(50) is 10 ug/g on S.carnaria larvae. Belongs to the neurotoxin 19 (CSTX) family. Double-CSTX subfamily. Characterization of function and toxicity was performed using CpTx1, a mixture of DELTA-miturgitoxin-Cp1a, DELTA-miturgitoxin-Cp1b and DELTA-miturgitoxin-Cp1c. While it is assumed that all three are active current data cannot prove this.