Multiple RNA interactions position Mrd1 at the site of the small subunit pseudoknot within the 90S pre-ribosome.

Multiple RNA interactions position Mrd1 at the site of the small subunit pseudoknot within the 90S pre-ribosome.
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多个RNA相互作用将MRD1定位在90年代前小骨中小亚基伪诺特的位置。

DOI:
10.1093/nar/gks1129
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发表时间:
2013-01
影响因子:
14.9
通讯作者:
Wieslander L
Wieslander L
中科院分区:
生物学2区
文献类型:
--
作者:
Segerstolpe Å;Granneman S;Björk P;de Lima Alves F;Rappsilber J;Andersson C;Högbom M;Tollervey D;Wieslander L

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真核生物中核糖体亚基的生物合成是一个复杂的多步骤过程。Mrd 1是一种必需的保守的小(40 S)核糖体亚基合成因子,是35 S前核糖体RNA(rRNA)早期裂解所必需的。酵母Mrd 1含有五个RNA结合结构域(RBD),所有这些都是蛋白质最佳功能所必需的。蛋白质组学数据表明,Mrd 1是早期前核糖体复合物的一部分,单个RBD的缺失会扰乱前核糖体结构。体内紫外线交联表明,Mrd 1在18 S区域内的两个位点(螺旋27(h27)和螺旋28)与pre-rRNA结合。主要结合位点位于h27,突变分析表明,这种相互作用需要Mrd 1的RBD 1 -3区域。RBD 2在h27结合中起主导作用,但其他RBD也直接起作用。h27和螺旋28位于形成中央假结的序列附近,这是成熟40 S亚基的关键结构特征。我们推测,Mrd 1的模块化结构与前rRNA加工和亚基组装协调假结形成。
Ribosomal subunit biogenesis in eukaryotes is a complex multistep process. Mrd1 is an essential and conserved small (40S) ribosomal subunit synthesis factor that is required for early cleavages in the 35S pre-ribosomal RNA (rRNA). Yeast Mrd1 contains five RNA-binding domains (RBDs), all of which are necessary for optimal function of the protein. Proteomic data showed that Mrd1 is part of the early pre-ribosomal complexes, and deletion of individual RBDs perturbs the pre-ribosomal structure. In vivo ultraviolet cross-linking showed that Mrd1 binds to the pre-rRNA at two sites within the 18S region, in helix 27 (h27) and helix 28. The major binding site lies in h27, and mutational analyses shows that this interaction requires the RBD1-3 region of Mrd1. RBD2 plays the dominant role in h27 binding, but other RBDs also contribute directly. h27 and helix 28 are located close to the sequences that form the central pseudoknot, a key structural feature of the mature 40S subunit. We speculate that the modular structure of Mrd1 coordinates pseudoknot formation with pre-rRNA processing and subunit assembly.
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