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- W2146409593 abstract "Interactions of Bcl-2 family proteins play a regulatory role in mitochondrial apoptosis. The pro-apoptotic protein Bak resides in the outer mitochondrial membrane, and the formation of Bak homo- or heterodimers is involved in the regulation of apoptosis. The previously reported structure of the human Bak protein (residues Glu16–Gly186) revealed that a zinc ion was coordinated with two pairs of Asp160 and His164 residues from the symmetry-related molecules. This zinc-dependent homodimer was regarded as an anti-apoptotic dimer. In the present study, we determined the crystal structure of the human Bak residues Ser23–Asn185 at 2.5 Å, and found a distinct type of homodimerization through Cys166 disulfide bridging between the symmetry-related molecules. In the two modes of homodimerization, the molecular interfaces are completely different. In the membrane-targeted model of the S–S bridged dimer, the BH3 motifs are too close to the membrane to interact directly with the anti-apoptotic relatives, such as Bcl-xL. Therefore, the Bak dimer structure reported here may represent a pro-apoptotic mode under oxidized conditions." @default.
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- W2146409593 date "2009-04-01" @default.
- W2146409593 modified "2023-10-03" @default.
- W2146409593 title "Novel dimerization mode of the human Bcl-2 family protein Bak, a mitochondrial apoptosis regulator" @default.
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- W2146409593 doi "https://doi.org/10.1016/j.jsb.2008.12.003" @default.
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