sentences:  It also boosts the specificity on the target and could be involved in the binding of the alpha unit.The whole complex is slightly acidic with a pH(I) of 5, but under a lower pH and/or high ionic strength the subunits dissociate.Just as the PLA2 enzyme the PLA2 toxin is Ca2+ dependent for hydrolysing fatty acyl ester bonds at the sn-2 position of glycerol-phospholipids.