The Fas-FADD death domain complex structure reveals the basis of DISC assembly and disease mutations.

The Fas-FADD death domain complex structure reveals the basis of DISC assembly and disease mutations.
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DOI:
10.1038/nsmb.1920
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发表时间:
2010-11
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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--
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由死亡受体Fas、衔接蛋白FADD和caspase-8形成的死亡诱导信号复合物(DISC)介导外源性凋亡程序。破坏DISC的Fas突变引起自身免疫性淋巴组织增生综合征(ALPS)。在这里,我们表明,Fas-FADD死亡结构域(DD)的复合物形成一个不对称的寡聚体结构组成的5-7 Fas DD和5 FADD DD,其接口港的ALP相关的突变。基于结构的突变破坏体外和活细胞中的Fas-FADD相互作用;突变的严重程度与结构中特定相互作用的发生次数相关。高度寡聚体结构解释了Fas信号传导中对六聚体或膜结合的FasL的需求。它还预测了Fas突变的强显性负效应,这通过信号传导测定得到证实。该结构最佳地定位FADD死亡效应结构域(DED)以与胱天蛋白酶-8DED相互作用,用于胱天蛋白酶募集和更高阶聚集。
The death inducing signaling complex (DISC) formed by the death receptor Fas, the adapter protein FADD and caspase-8 mediates the extrinsic apoptotic program. Mutations in Fas that disrupt the DISC cause autoimmune lymphoproliferative syndrome (ALPS). Here we show that the Fas–FADD death domain (DD) complex forms an asymmetric oligomeric structure composed of 5–7 Fas DD and 5 FADD DD, whose interfaces harbor ALPS-associated mutations. Structure-based mutations disrupt the Fas–FADD interaction in vitro and in living cells; the severity of a mutation correlates with the number of occurrence of a particular interaction in the structure. The highly oligomeric structure explains the requirement for hexameric or membrane-bound FasL in Fas signaling. It also predicts strong dominant negative effects of Fas mutations, which are confirmed by signaling assays. The structure optimally positions the FADD death effector domain (DED) to interact with the caspase-8 DED for caspase recruitment and higher order aggregation.
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