An RNA conformational switch regulates pre-18S rRNA cleavage.

An RNA conformational switch regulates pre-18S rRNA cleavage.
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RNA构象开关调节18S前的rRNA裂解。

DOI:
10.1016/j.jmb.2010.09.064
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发表时间:
2011-01-07
影响因子:
5.6
通讯作者:
Karbstein K
Karbstein K
中科院分区:
生物学2区
文献类型:
--
作者:
Lamanna AC;Karbstein K

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为了产生成熟的核糖体RNA(rRNA),多顺反子rRNA转录物在有序的一系列事件中被切割。我们揭示了18SrRNA 3′端两个基本切割步骤排序的分子基础。使用在体外和体内结构探测,RNA结合和切割实验,和酵母遗传学,我们证明,保守的RNA序列的间隔区之间的18S和5.8S rRNA的碱基对与18S rRNA的解码位点在早期组装中间体。在位点A2的核仁切割切除该序列元件,导致前18S rRNA中的构象转换,通过该构象转换形成核糖体解码位点。这种构象转换将核酸酶Nob1定位在18S rRNA的3′端进行细胞质切割,并且是体内和体外18S rRNA最终成熟步骤所必需的。更一般地说,我们的数据表明,RNA形成稳定的结构开关的内在能力被利用来排序和调节RNA依赖的生物过程。
To produce mature ribosomal RNAs (rRNAs), polycistronic rRNA transcripts are cleaved in an ordered series of events. We have uncovered the molecular basis for the ordering of two essential cleavage steps at the 3′-end of 18S rRNA. Using in vitro and in vivo structure probing, RNA binding and cleavage experiments, and yeast genetics, we demonstrate that a conserved RNA sequence in the spacer region between the 18S and 5.8S rRNAs base pairs with the decoding site of 18S rRNA in early assembly intermediates. Nucleolar cleavage at site A2 excises this sequence element, leading to a conformational switch in pre-18S rRNA by which the ribosomal decoding site is formed. This conformational switch positions the nuclease Nob1 for cytoplasmic cleavage at the 3′-end of 18S rRNA and is required for the final maturation step of 18S rRNA in vivo and in vitro. More generally, our data show that the intrinsic ability of RNA to form stable structural switches is exploited to order and regulate RNA-dependent biological processes.
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