Abstract
During apoptosis, mitochondria permeabilize the outer membranes to release apoptogenic proteins from the intermembrane space. This process termed mitochondrial outer membrane permeabilization (MOMP) is regulated by Bcl-2 family proteins. Bax is an effector proapoptotic molecule that permeabilizes the lipid membranes when it is activated by activator BH3-only proteins. We investigated this critical event by developing simple but faithful vesicle systems-outer membrane vesicles (OMVs) and liposomes-to visualize the pores in the membrane by using cryo-electron microscopy (cryo-EM). We have revealed the morphology of the pore, determined the localization of Bax labeled with nanogold and have performed image analysis to help understand the mechanisms of pore formation induced by Bax.
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