Caspase-3 is involved in the activation cascade of caspases responsible for apoptosis e, Xenopus/Amphibian,ecution. At the onset of apoptosis, Caspase-3 proteolytically cleaves poly(ADP-ribose) polymerase (PARP) at a 216-Asp-|-Gly-217 bond as well as cleaving and activating the sterol regulatory element binding proteins (SREBPs) between the basic heli, Xenopus/Amphibian,-loop-heli, Xenopus/Amphibian, leucine zipper domain and the membrane attachment domain. In addition Caspase-3 cleaves and activates caspase-6, -7, -9.