The N-terminal domain of Nup159 forms a beta-propeller that functions in mRNA export by tethering the helicase Dbp5 to the nuclear pore.

The N-terminal domain of Nup159 forms a beta-propeller that functions in mRNA export by tethering the helicase Dbp5 to the nuclear pore.
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Nup159 的 N 端结构域形成一个 β 螺旋桨,通过将解旋酶 Dbp5 束缚到核孔来在 mRNA 输出中发挥作用。

DOI:
10.1016/j.molcel.2004.10.032
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发表时间:
2004
期刊:
影响因子:
16
通讯作者:
Weis,Karsten
Weis,Karsten
中科院分区:
生物学1区
文献类型:
--
作者:
Weirich,ChristineS;Erzberger,JanP;Berger,JamesM;Weis,Karsten

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真核细胞中mRNA的核输出由可溶性转运因子和核孔复合物(NPC)的组分介导。胞质定向核孔蛋白Nup159通过其保守的N端结构域(NTD)在mRNA输出中起关键作用。在这里,我们报告了Nup159 NTD的晶体结构,精确到2.5 μ m。该结构揭示了一个异常不对称的七叶β螺旋桨,在整个真核生物中结构保守。使用基于结构的保守性分析,我们有针对性的特定表面残基的诱变。NTD保守环中的残基取代废除了与Dbp5的体外结合,Dbp5是mRNA输出所需的DEAD盒解旋酶。在体内,这些突变导致Dbp5错误定位并阻断mRNA输出。这些发现表明,Nup159 NTD在mRNA输出中作为结合平台发挥作用,将Dbp5分子拴系在核外周并将该mRNA重塑因子局部集中在NPC的细胞质面。
Nuclear export of mRNA in eukaryotic cells is mediated by soluble transport factors and components of the nuclear pore complex (NPC). The cytoplasmically oriented nuclear pore protein Nup159 plays a critical role in mRNA export through its conserved N-terminal domain (NTD). Here, we report the crystal structure of the Nup159 NTD, refined to 2.5 Å. The structure reveals an unusually asymmetric seven-bladed β-propeller that is structurally conserved throughout eukarya. Using structure-based conservation analysis, we have targeted specific surface residues for mutagenesis. Residue substitutions in a conserved loop of the NTD abolish in vitro binding to Dbp5, a DEAD box helicase required for mRNA export. In vivo, these mutations cause Dbp5 mislocalization and block mRNA export. These findings suggest that the Nup159 NTD functions in mRNA export as a binding platform, tethering shuttling Dbp5 molecules at the nuclear periphery and locally concentrating this mRNA remodeling factor at the cytoplasmic face of the NPC.
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