BIM and tBID are not mechanistically equivalent when assisting BAX to permeabilize bilayer membranes

The Journal of Biological Chemistry
Oihana TerronesG Basañez

Abstract

BIM and tBID are two BCL-2 homology 3 (BH3)-only proteins with a particularly strong capacity to trigger BAX-driven mitochondrial outer membrane permeabilization, a crucial event in mammalian apoptosis. However, the means whereby BIM and tBID fulfill this task is controversial. Here, we used a reconstituted liposomal system bearing physiological relevance to explore systematically how the BAX-permeabilizing function is influenced by interactions of BIM/BID-derived proteins and BH3 motifs with multidomain BCL-2 family members and with membrane lipids. We found that nanomolar dosing of BIM proteins sufficed to reverse completely the inhibition of BAX permeabilizing activity exerted by all antiapoptotic proteins tested (BCL-2, BCL-X(L), BCL-W, MCL-1, and A1). This effect was reproducible by a peptide representing the BH3 motif of BIM, whereas an equivalent BID BH3 peptide was less potent and more selective, reversing antiapoptotic inhibition. On the other hand, in the absence of BCL-2-type proteins, BIM proteins and the BIM BH3 peptide were inefficient, directly triggering the BAX-permeabilizing function. In contrast, tBID alone potently assisted BAX to permeabilize membranes at least in part by producing a structural distortion i...Continue Reading

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