Molecular snapshots of the Pex1/6 AAA+ complex in action.

Molecular snapshots of the Pex1/6 AAA+ complex in action.
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DOI:
10.1038/ncomms8331
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发表时间:
2015-06-12
影响因子:
16.6
通讯作者:
Wendler, Petra
Wendler, Petra
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Ciniawsky, Susanne;Grimm, Immanuel;Saffian, Delia;Girzalsky, Wolfgang;Erdmann, Ralf;Wendler, Petra

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过氧体蛋白Pex1和Pex6形成了一种异六聚体II型AAA+ATPase复合体,它为必需的蛋白质跨过氧体膜运输提供燃料。在人类中,任何一种ATPase的突变都会导致严重的过氧化物体症和过早死亡。我们对酵母Pex1/6复合体进行了广泛的结构和生化分析。杂六聚体形成具有非典型AAA+络合物的三角构型的Pex1/6二聚体的三聚体。虽然Pex6的C-末端核苷酸结合域(D2)构成了该复合体的主要ATPase活性,但两个D2都含有重要的底物结合基序。ATP水解导致复合体的泵送运动,这表明Pex1/6功能涉及底物通过其中心通道的转运。一个D2结构域中Walker B基序的突变导致相邻结构域中的ATP水解,从而使人们能够从结构上深入了解这些独特的异六聚体AAA+组装的域间通讯。Pex1和Pex6在过氧化体膜上形成具有三角形构型的异六聚体AAA+ATPase复合体。在这里,作者使用电子显微镜来证明该复合体在ATP水解时经历了构象变化,并证明了相邻核苷酸结合域之间的域间通信。
The peroxisomal proteins Pex1 and Pex6 form a heterohexameric type II AAA+ ATPase complex, which fuels essential protein transport across peroxisomal membranes. Mutations in either ATPase in humans can lead to severe peroxisomal disorders and early death. We present an extensive structural and biochemical analysis of the yeast Pex1/6 complex. The heterohexamer forms a trimer of Pex1/6 dimers with a triangular geometry that is atypical for AAA+ complexes. While the C-terminal nucleotide-binding domains (D2) of Pex6 constitute the main ATPase activity of the complex, both D2 harbour essential substrate-binding motifs. ATP hydrolysis results in a pumping motion of the complex, suggesting that Pex1/6 function involves substrate translocation through its central channel. Mutation of the Walker B motif in one D2 domain leads to ATP hydrolysis in the neighbouring domain, giving structural insights into inter-domain communication of these unique heterohexameric AAA+ assemblies. Pex1 and Pex6 form a heterohexameric AAA+ ATPase complex with triangular geometry at the peroxisome membrane. Here the authors use electron microscopy to show that the complex undergoes conformational changes upon ATP hydrolysis, and demonstrate inter-domain communication between neighbouring nucleotide-binding domains.
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