The structure of the NXF2/NXT1 heterodimeric complex reveals the combined specificity and versatility of the NTF2-like fold.

The structure of the NXF2/NXT1 heterodimeric complex reveals the combined specificity and versatility of the NTF2-like fold.
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DOI:
10.1016/j.jmb.2011.11.027
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发表时间:
2012-01-27
影响因子:
5.6
通讯作者:
Williamson, James R.
Williamson, James R.
中科院分区:
生物学2区
文献类型:
--
作者:
Kerkow, Donald E.;Carmel, Andrew B.;Menichelli, Elena;Ambrus, Geza;Hills, Ronald D., Jr.;Gerace, Larry;Williamson, James R.

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核输出因子(NXF)家族的nxf1样成员协调mRNA的大量核输出,而功能不同的NXF变体蛋白执行单独的底物和组织特异性RNA调控。后生动物具有至少一个nxf1样基因和一个或多个NXF变异基因。这两种蛋白与ntf2相关的eXporT蛋白(NXT)的异源二聚化是NXF家族功能的核心,但鉴于NXF/NXT复合物的多样性,异源二聚化的特异性和机制尚不清楚。在这里,我们报道了与ceNXT1结合的秀丽隐杆线虫NXF变体ceNXF2的结构和功能分析。已经确定了对NXF/NXT异源二聚体的稳定性和特异性至关重要的接触,包括一个可能的磷酸化调节位点。ceNXF2 NTF2结构域至少有两个核孔蛋白(Nup)结合袋,这是ceNXF2/ceNXT1在核膜上共定位所必需的。出乎意料的是,在ceNXF2/ceNXT1复合物的异源二聚体界面上形成了一个Nup结合口袋,这表明NXT结合直接调节NXF的功能。
NXF1-like members of the Nuclear eXport Factor (NXF) family orchestrate bulk nuclear export of mRNA, while functionally distinct NXF variant proteins carry out separate substrate and tissue specific RNA regulation. Metazoan organisms possess at least one NXF1-like gene and one or more NXF variant genes. Heterodimerization of both proteins with the NTF2-related eXporT protein (NXT) is central to NXF family function, but given the multiplicity of NXF/NXT complexes, the specificity and mechanism of heterodimerization remains unclear. Here, we report the structural and functional analysis of the Caenorhabditis elegans NXF variant, ceNXF2, bound to ceNXT1. Contacts crucial for NXF/NXT heterodimer stability and specificity have been identified, including a probable site for phosphoregulation. The ceNXF2 NTF2 domain bears at least two nucleoporin (Nup) binding pockets necessary for colocalization of ceNXF2/ceNXT1 at the nuclear envelope. Unexpectedly, one Nup binding pocket is formed at the heterodimer interface of the ceNXF2/ceNXT1 complex, demonstrating that NXT binding directly regulates NXF function.
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