Conformational Changes in BID, a Pro-apoptotic BCL-2 Family Member, upon Membrane Binding

The BCL-2 family proteins constitute a critical control point in apoptosis. BCL-2 family proteins display structural homology to channel-forming bacterial toxins, such as colicins, transmembrane domain of diphtheria toxin, and the N-terminal domain of δ-endotoxin. By analogy, it has been hypothesized the BCL-2 family proteins would unfold and insert into the lipid bilayer upon membrane association. We applied the site-directed spin labeling method of electron paramagnetic resonance spectroscopy to the pro-apoptotic member BID. Here we show that helices 6-8 maintain an α-helical conformation in membranes with a lipid composition resembling mitochondrial outer membrane contact sites. However, unlike colicins and the transmembrane domain of diphtheria toxin, these helices of BID are bound to the lipid bilayer without adopting a transmembrane orientation. Our study presents a more detailed model for the reorganization of the structure of tBID on membranes.

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