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:
Structure (London, England : 1993)
影响因子:
--
通讯作者:
Akey CW
Akey CW
中科院分区:
其他
文献类型:
--
作者:
Yuan S;Yu X;Topf M;Dorstyn L;Kumar S;Ludtke SJ;Akey CW

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果蝇Apaf-1相关的杀伤细胞(Dark)在内在细胞死亡途径中形成一个线粒体。在这项研究中,我们表明,黑暗形成一个单环时,引发剂procaspases绑定。由此产生的Dark-Dronc复合物有效地切割DrICE;因此,一个单环代表果蝇的染色体。然后,我们确定了一个双环的3D结构,分辨率约为6.9 μ m,并创建了一个模型的线粒体。暗复合体中的亚基相互作用与Apaf-1和CED-4中的亚基相互作用相似,但也存在显著差异。特别是,Dark在核苷酸结合口袋中“丢失”了一个环,这为线粒体中可能的dATP交换打开了一条路径。此外,半胱天冬酶募集结构域(CARD)在暗小体的中心枢纽上形成冠状结构。这种CARD几何结构表明,形成活性Dark-Dronc复合物需要构象变化。当结合在一起时,这些数据提供了对染色体结构,功能和进化的新见解。
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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