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• W2058971946 abstract "The mechanism by which the proapoptotic protein Bax releases cytochrome c from mitochondria is not fully understood. The present work approaches this problem using C-terminal truncated oligomeric Bax (BaxDeltaC). Micromolar concentrations of BaxDeltaC released cytochrome c from isolated rat heart and liver mitochondria, while the release of adenylate kinase was not significantly affected. BaxDeltaC also released cytochrome c but not adenylate kinase from outer membrane vesicles filled with these proteins. However, BaxDeltaC was ineffective in releasing cytochrome c when outer membrane vesicles were obtained in the presence of glycerol, conditions under which the number of contact sites was drastically reduced. BaxDeltaC did not liberate encapsulated cytochrome c and adenylate kinase from pure phospholipid vesicles or vesicles reconstituted with porin. However, when the hexokinase-porin-adenine nucleotide translocase complex from brain mitochondria was reconstituted in vesicles, BaxDeltaC released internal cytochrome c but not adenylate kinase. In all these systems, only a small portion of total cytochrome c present in either mitochondria or vesicles could be liberated by BaxDeltaC. BaxDeltaC also increased the accessibility of external cytochrome c to either oxidation by complex IV or reduction by complex III in intact liver and heart mitochondria.(1) BaxDeltaC selectively releases cytochrome c and enables a bidirectional movement of cytochrome c across the outer mitochondrial membrane. (2) A multiprotein complex that resembles the mitochondrial contact sites is a prerequisite for BaxDeltaC action. (3) A limited pool of cytochrome c becomes the first target for BaxDeltaC." @default.
• W2058971946 created "2016-06-24" @default.
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• W2058971946 date "2001-09-21" @default.
• W2058971946 modified "2023-10-15" @default.
• W2058971946 title "Oligomeric C‐terminal truncated Bax preferentially releases cytochrome <i>c</i> but not adenylate kinase from mitochondria, outer membrane vesicles and proteoliposomes" @default.
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• W2058971946 doi "https://doi.org/10.1016/s0014-5793(01)02858-7" @default.
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