Symportin 1 chaperones 5S RNP assembly during ribosome biogenesis by occupying an essential rRNA-binding site.

Symportin 1 chaperones 5S RNP assembly during ribosome biogenesis by occupying an essential rRNA-binding site.
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在核糖体生物发生过程中,通过占据必需的rRNA结合位点,在核糖体生物发生过程中进行了1伴侣。

DOI:
10.1038/ncomms7510
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发表时间:
2015-04-07
影响因子:
16.6
通讯作者:
Sinning, Irmgard
Sinning, Irmgard
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Calvino, Fabiola R.;Kharde, Satyavati;Ori, Alessandro;Hendricks, Astrid;Wild, Klemens;Kressler, Dieter;Bange, Gert;Hurt, Ed;Beck, Martin;Sinning, Irmgard

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在60 S生物发生期间,由5S RNA、RpL 5和RpL 11组成的成熟5S RNP组装成前60 S颗粒,其中对接依赖于RpL 11与25 S RNA的螺旋84(H84)相互作用。5S RNP是如何组装以招募到60岁以前的人中的尚不清楚。在这里,我们报告的三元共转运蛋白Syo 1-RpL 5-N-RpL 11复合物的晶体结构,并提供5S RNP组装的生化和结构的见解。Syo 1保护RpL 11上的25 S RNA结合表面,并与H84竞争结合。下拉实验表明,H84从三元复合物中释放RpL 11,但在5S RNA存在下不释放。交联质谱法显示了5S RNA掺入Syo 1-RpL 5-RpL 11复合物后的结构重排,支持前5S RNP的形成。我们的数据强调了Syo 1在核糖体蛋白转运和作为5S RNP组装平台的双重作用。 80 S核糖体的生物发生涉及200多个前核糖体因子,其确保核糖体蛋白和RNA的顺序组装。在这里,作者表明,核转运衔接子Syo 1在通过分子模拟掺入前60 S之前屏蔽了RpL 11上的5S RNP对接位点。
During 60S biogenesis, mature 5S RNP consisting of 5S RNA, RpL5 and RpL11, assembles into a pre-60S particle, where docking relies on RpL11 interacting with helix 84 (H84) of the 25S RNA. How 5S RNP is assembled for recruitment into the pre-60S is not known. Here we report the crystal structure of a ternary symportin Syo1–RpL5-N–RpL11 complex and provide biochemical and structural insights into 5S RNP assembly. Syo1 guards the 25S RNA-binding surface on RpL11 and competes with H84 for binding. Pull-down experiments show that H84 releases RpL11 from the ternary complex, but not in the presence of 5S RNA. Crosslinking mass spectrometry visualizes structural rearrangements on incorporation of 5S RNA into the Syo1–RpL5–RpL11 complex supporting the formation of a pre-5S RNP. Our data underline the dual role of Syo1 in ribosomal protein transport and as an assembly platform for 5S RNP. Biogenesis of the 80S ribosome involves more than 200 pre-ribosomal factors, which ensure the sequential assembly of ribosomal proteins and RNAs. Here the authors show that the nuclear transport adaptor Syo1 shields the 5S RNP-docking site on RpL11 before incorporation into the pre-60S through molecular mimicry.
DOI: 10.1107/s0907444910045749
发表时间: 2011-04
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影响因子: --
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