Schistosome voltage-dependent calcium channel beta subunit (SmCavB) (SmCavB)

Schistosome voltage-dependent calcium channel beta subunits (SmCavB) are essential accessory proteins that regulate the function of the pore-forming alpha-1 subunits in Schistosoma species (Kohn et al., 2001, JBC). These parasites possess two distinct types of beta subunits: a conventional form similar to mammalian versions and a variant form (SmBv) that is unique to trematodes and lacks the conserved AID-binding pocket (Greenberg, 2005, Mol Biochem Parasitol). These variant subunits are critical for the parasite's calcium homeostasis, which in turn controls muscle contraction and the structural integrity of the tegument. The primary anthelmintic drug, praziquantel (PZQ), is known to interact with these channels, specifically requiring the presence of the variant beta subunit to exert its effect (Park et al., 2019, Science). PZQ binding induces a rapid and massive influx of calcium ions, leading to immediate spastic paralysis and tegumental vacuolization, which allows the host immune system to eliminate the worms. Because these variant subunits are absent in humans, they represent a highly specific and effective therapeutic target for treating schistosomiasis.

Other names

Schistosoma mansoni voltage-gated calcium channel beta subunitSmBSmbetaSmCavBVariant beta subunitSmCavBv

Allosteric activation of the voltage-gated calcium channel complex containing the variant beta subunit, leading to massive calcium influx.