Structural evidence for common ancestry of the nuclear pore complex and vesicle coats.

Structural evidence for common ancestry of the nuclear pore complex and vesicle coats.
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DOI:
10.1126/science.1165886
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发表时间:
2008-11-28
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Schwartz TU
Schwartz TU
中科院分区:
其他
文献类型:
--
作者:
Brohawn SG;Leksa NC;Spear ED;Rajashankar KR;Schwartz TU

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核孔复合物(NPC)促进核质转运。这些大规模的组件包括一个八倍对称的建筑蛋白和中央通道苯丙氨酸甘氨酸重复蛋白形成的运输屏障支架。我们确定了Nup85·Seh1结构,这是七聚体Nup84复合物中的一个模块。结构、生化和遗传分析将Nup84复合物定位在两个外周NPC环中。我们建立了一个保守的三方元件,祖先coatomer元件ACE1,在几个核孔蛋白和囊泡外壳蛋白中重复出现,提供了从共同祖先共同进化的结构证据。我们确定的相互作用,定义组织的Nup84复合物的基础上比较囊泡外套和确认的诱变位点。我们建议NPC支架,像囊泡外套,是由多边形的顶点和边缘形成一个膜近侧的晶格提供额外的核孔蛋白的对接站点。
Nuclear pore complexes (NPCs) facilitate nucleocytoplasmic transport. These massive assemblies comprise an eight-fold symmetric scaffold of architectural proteins and central-channel phenylalanine-glycine-repeat proteins forming the transport barrier. We determined the Nup85•Seh1 structure, a module in the heptameric Nup84 complex. Structural, biochemical, and genetic analyses position the Nup84 complex in two peripheral NPC rings. We establish a conserved tripartite element, the ancestral coatomer element ACE1, that reoccurs in several nucleoporins and vesicle coat proteins, providing structural evidence of coevolution from a common ancestor. We identify interactions that define the organization of the Nup84 complex based on comparison with vesicle coats and confirmed the sites by mutagenesis. We propose the NPC scaffold, like vesicle coats, is composed of polygons with vertices and edges forming a membrane-proximal lattice providing docking sites for additional nucleoporins.
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