A convergence of rRNA and mRNA quality control pathways revealed by mechanistic analysis of nonfunctional rRNA decay.

A convergence of rRNA and mRNA quality control pathways revealed by mechanistic analysis of nonfunctional rRNA decay.
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DOI:
10.1016/j.molcel.2009.04.017
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发表时间:
2009-05-14
期刊:
影响因子:
16
通讯作者:
Moore MJ
Moore MJ
中科院分区:
生物学1区
文献类型:
--
作者:
Cole SE;LaRiviere FJ;Merrikh CN;Moore MJ

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真核生物拥有众多的质量控制系统,可以监控 RNA 的合成和成品的完整性。我们之前证明了酿酒酵母拥有一种质量控制机制,即非功能性 rRNA 衰减 (NRD),能够检测和消除翻译缺陷的 rRNA。在这里,我们证明NRD可以分为两种机制上不同的途径:一种消除解码位点(18S NRD)中含有有害突变的rRNA,另一种消除肽基转移酶中心(25S NRD)中含有有害突变的rRNA。 18S NRD 依赖于翻译延伸,并利用与参与 no-go mRNA 衰减 (NGD) 的蛋白质相同的蛋白质。在积累 18S NRD 和 NGD 衰变中间体的细胞中,这两种 RNA 类型都可以在 P 体中看到。我们认为 18S NRD 和 NGD 是同一起始事件的不同可观察结果:核糖体在翻译延伸过程中不适当地停滞在有义密码子处。
Eukaryotes possess numerous quality control systems that monitor both the synthesis of RNA and the integrity of the finished products. We previously demonstrated that Saccharomyces cerevisiae possesses a quality control mechanism, nonfunctional rRNA decay (NRD), capable of detecting and eliminating translationally defective rRNAs. Here we show that NRD can be divided into two mechanistically distinct pathways: one that eliminates rRNAs with deleterious mutations in the decoding site (18S NRD) and one that eliminates rRNAs containing deleterious mutations in the peptidyl transferase center (25S NRD). 18S NRD is dependent on translation elongation and utilizes the same proteins as those participating in no-go mRNA decay (NGD). In cells that accumulate 18S NRD and NGD decay intermediates, both RNA types can be seen in P-bodies. We propose that 18S NRD and NGD are different observable outcomes of the same initiating event: a ribosome stalled inappropriately at a sense codon during translation elongation.
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