Sus1, Cdc31, and the Sac3 CID region form a conserved interaction platform that promotes nuclear pore association and mRNA export.

Sus1, Cdc31, and the Sac3 CID region form a conserved interaction platform that promotes nuclear pore association and mRNA export.
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DOI:
10.1016/j.molcel.2009.01.033
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发表时间:
2009-03-27
期刊:
影响因子:
16
通讯作者:
Stewart, Murray
Stewart, Murray
中科院分区:
生物学1区
文献类型:
--
作者:
Jani, Divyang;Lutz, Sheila;Marshall, Neil J.;Fischer, Tamas;Koehler, Alwin;Ellisdon, Andrew M.;Hurt, Ed;Stewart, Murray

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酵母Sac 3:Cdc 31:Sus 1:Thp 1(TREX-2)复合物促进活跃转录基因与核孔(NPC)的重新定位和关联-“基因门控”-这是整合转录、加工和mRNA核输出的核心。我们在这里提出的晶体结构的Sus 1和Cdc 31绑定到一个中心区域的Sac 3(CID域),这是至关重要的,它的功能。Sac 3CID形成一个长的、轻微起伏的α螺旋,一条Cdc 31和两条Sus 1链围绕着它。Sus 1有一个铰接的螺旋发夹式折叠,便于其包裹在Sac 3周围。使用选择性破坏单个链与Sac 3结合的工程突变的体内研究表明,Sus 1和Cdc 31协同作用,以促进TREX-2和mRNA核输出的NPC关联。这些数据表明Sac 3CID在TREX-2内提供了一个支架,以整合蛋白质复合物之间的相互作用,以促进基因表达期间转录和mRNA输出的偶联。
The yeast Sac3:Cdc31:Sus1:Thp1 (TREX-2) complex facilitates the repositioning and association of actively transcribing genes with nuclear pores (NPCs)—“gene gating”—that is central to integrating transcription, processing, and mRNA nuclear export. We present here the crystal structure of Sus1 and Cdc31 bound to a central region of Sac3 (the CID domain) that is crucial for its function. Sac3CID forms a long, gently undulating α helix around which one Cdc31 and two Sus1 chains are wrapped. Sus1 has an articulated helical hairpin fold that facilitates its wrapping around Sac3. In vivo studies using engineered mutations that selectively disrupted binding of individual chains to Sac3 indicated that Sus1 and Cdc31 function synergistically to promote NPC association of TREX-2 and mRNA nuclear export. These data indicate Sac3CID provides a scaffold within TREX-2 to integrate interactions between protein complexes to facilitate the coupling of transcription and mRNA export during gene expression.
SFI1P具有保守的中心蛋白结合位点,并且在萌芽的酵母螺旋极体复制中具有重要功能。
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