Rapid RNase L-driven arrest of protein synthesis in the dsRNA response without degradation of translation machinery.

Rapid RNase L-driven arrest of protein synthesis in the dsRNA response without degradation of translation machinery.
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DOI:
10.1261/rna.062000.117
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发表时间:
2017-11
期刊:
RNA (New York, N.Y.)
影响因子:
--
通讯作者:
Korennykh A
Korennykh A
中科院分区:
其他
文献类型:
--
作者:
Donovan J;Rath S;Kolet-Mandrikov D;Korennykh A

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哺乳动物细胞对双链RNA(dsRNA)的反应是激活一种抑制转录的核糖核酸内切酶RNase L。该领域的共识表明,RNase L通过降解核糖体RNA(rRNA)和信使RNA(mRNA)来阻止蛋白质合成。然而,在这里,我们提供了一个不同的和更有效的机制的证据。通过对人类细胞中RNase L产生的丰富RNA片段进行测序,我们确定了两组非编码RNA的位点特异性切割:Y-RNA,其功能知之甚少,和胞质tRNA,这是翻译所必需的。对肺癌细胞中人类RNA切割与新生蛋白质合成的定量分析表明,当tRNA以及rRNA和mRNA仍然完整时,RNase L停止全局翻译。因此,RNase L不必降解翻译机器来停止蛋白质合成。我们的数据指出了一种快速的机制,将微小的RNA切割转化为细胞范围的翻译停滞。
Mammalian cells respond to double-stranded RNA (dsRNA) by activating a translation-inhibiting endoribonuclease, RNase L. Consensus in the field indicates that RNase L arrests protein synthesis by degrading ribosomal RNAs (rRNAs) and messenger RNAs (mRNAs). However, here we provide evidence for a different and far more efficient mechanism. By sequencing abundant RNA fragments generated by RNase L in human cells, we identify site-specific cleavage of two groups of noncoding RNAs: Y-RNAs, whose function is poorly understood, and cytosolic tRNAs, which are essential for translation. Quantitative analysis of human RNA cleavage versus nascent protein synthesis in lung carcinoma cells shows that RNase L stops global translation when tRNAs, as well as rRNAs and mRNAs, are still intact. Therefore, RNase L does not have to degrade the translation machinery to stop protein synthesis. Our data point to a rapid mechanism that transforms a subtle RNA cleavage into a cell-wide translation arrest.
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