Angiogenin-induced tRNA fragments inhibit translation initiation.

Angiogenin-induced tRNA fragments inhibit translation initiation.
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DOI:
10.1016/j.molcel.2011.06.022
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发表时间:
2011-08-19
期刊:
影响因子:
16
通讯作者:
Anderson P
Anderson P
中科院分区:
生物学1区
文献类型:
--
作者:
Ivanov P;Emara MM;Villen J;Gygi SP;Anderson P

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Angiogenin is a stress-activated ribonuclease that cleaves tRNA within anticodon loops to produce tRNA-derived stress-induced fragments (tiRNAs). Transfection of natural or synthetic tiRNAs inhibits protein synthesis and triggers the phospho-eIF2α independent assembly of stress granules (SGs), essential components of the stress response program. We show that selected tiRNAs inhibit protein synthesis by displacing eIF4G/eIF4A from uncapped>capped RNAs. tiRNAs also displace eIF4F, but not eIF4E:4EBP1, from isolated m7G cap. We identify a terminal oligoguanine motif that is required to displace the eIF4F complex, inhibit translation, and induce SG assembly. We show that the tiRNA-associated translational silencer YB-1 contributes to angiogenin-, tiRNA-, and oxidative stress-induced translational repression. Our data reveal some of the mechanisms by which stress-induced tRNA cleavage inhibits protein synthesis and activates a cytoprotective stress response program.
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