Pore-forming toxin (PFT) that consists of a crown-shaped octamer or nonamer that forms cation-selective hydrophilic pores of about 1.5 nm (inside) and 13 nm (outside) (By similarity). It causes cardiac stimulation (By similarity). Also causes hemolysis (HC(50)=0.4 nM) (PubMed:31295915). Interestingly, the Phe-16 is crucial for hemolysis (By similarity). Pore formation is a multi-step process that involves specific recognition of membrane sphingomyelin (but neither cholesterol nor phosphatidylcholine) using aromatic rich region and adjacent phosphocholine (POC) binding site, firm binding to the membrane (mainly driven by hydrophobic interactions) accompanied by the transfer of the N-terminal region to the lipid-water interface and finally pore formation after oligomerization of monomers (By similarity). It is probable that a dimeric form is an assembly intermediate before the complete oligomerization (By similarity). The formation of stable pores occurs only in vesicles composed of DOPC/SM (there is no oligomerization when the PFT is treated with vesicles of DOPC or SM alone) (By similarity). The transmembrane pore displays 8 lateral perforations, one at each subunit-subunit interface, partially occupied by the acyl-chain region of a bridging lipid (By similarity). Each pore contains 24 lipid molecules, firmly bound to each subunit, that is, 3 lipids (L1, L2, L3, L4 and/or L5) are associated to each subunit (By similarity). Lipid L1 bridges 2 subunits, whereas lipids L2 and L3 bind to sites at single subunit (By similarity). Stable up to about 65 degrees Celsius. Octamer or nonamer in membranes. Monomer in the soluble state. Forms an alpha-helical membrane channel in the prey. The N-terminal region, before the pore is formed, is bound to the lipid membrane. It partitions into the lipid-water interface and stabilizes the monomeric molecule on the membrane. Finally, it traverses the bilayer, thus forming the transmembrane pore. This protein has been found to bind carbohydrates, since it shows a substantial delay in elution profile in size-exclusion chromatography. The carbohydrate pocket ovelaps with the lipid-binding module of actinoporins. Belongs to the actinoporin family. Sea anemone subfamily.