Structure of the Drosophila apoptosome at 6.9 å resolution.
Structure of the Drosophila apoptosome at 6.9 å resolution.
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DOI:
10.1016/j.str.2010.10.009
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发表时间:
2011-01-12
期刊:
影响因子:
--
通讯作者:
Akey CW
中科院分区:
文献类型:
--
作者:
Yuan S;Yu X;Topf M;Dorstyn L;Kumar S;Ludtke SJ;Akey CW
The Drosophila Apaf-1 related killer (Dark) forms an apoptosome in the intrinsic cell death pathway. In this study, we show that Dark forms a single-ring when initiator procaspases are bound. The resulting Dark-Dronc complex cleaves DrICE efficiently; hence, a single-ring represents the Drosophila apoptosome. We then determined the 3D structure of a double-ring at ~6.9Å resolution and created a model of the apoptosome. Subunit interactions in the Dark complex are similar to those in Apaf-1 and CED-4 apoptosomes, but there are also significant differences. In particular, Dark has “lost” a loop in the nucleotide binding pocket, which opens a path for possible dATP exchange in the apoptosome. In addition, caspase recruitment domains (CARDs) form a crown on the central hub of the Dark apoptosome. This CARD geometry suggests that conformational changes will be required to form active Dark-Dronc complexes. When taken together, these data provide novel insights into apoptosome structure, function and evolution.
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