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- W3126143802 abstract "Caspase-8-cleaved Bid (cBid) associates with mitochondria and promotes the activation of BAX, leading to mitochondria outer membrane permeabilization (MOMP) and apoptosis. However, current structural models of cBid are largely based on studies using membrane vesicles and detergent micelles. Here we employ spin-label ESR and site-directed PEGylation methods to identify conformations of cBid at real mitochondrial membranes, revealing stepwise mechanisms in the activation process. Upon the binding of cBid to mitochondria, its structure is reorganized to expose the BH3 domain while leaving the structural integrity only slightly altered. The mitochondria-bound cBid is in association with Mtch2 and it remains in the primed state until interacting with BAX. The interaction subsequently triggers the fragmentation of cBid, causes large conformational changes, and promotes BAX-mediated MOMP. Our results reveal structural differences of cBid between mitochondria and other lipid-like environments and, moreover, highlight the role of the membrane binding in modifying cBid structure and assisting the inactive-to-active transition in function." @default.
- W3126143802 created "2021-02-01" @default.
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- W3126143802 creator A5091824929 @default.
- W3126143802 date "2021-01-18" @default.
- W3126143802 modified "2023-10-10" @default.
- W3126143802 title "Stepwise activation of the pro-apoptotic protein Bid at mitochondrial membranes" @default.
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- W3126143802 doi "https://doi.org/10.1038/s41418-020-00716-5" @default.
- W3126143802 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8184993" @default.
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