Angiogenin-induced TRNA-derived Stress-induced RNAs Promote Stress-induced Stress Granule Assembly

Overview

Journal J Biol Chem

Specialty Biochemistry

Date 2010 Feb 5

PMID 20129916

Citations 287

Authors

Mohamed M Emara

Pavel Ivanov

Tyler Hickman

Nemisha Dawra

Sarah Tisdale

Nancy Kedersha

Guo-Fu Hu

Paul Anderson

Affiliations

Soon will be listed here.

Abstract

Angiogenin (ANG) is a secreted ribonuclease that cleaves tRNA to initiate a stress-response program in mammalian cells. Here we show that ANG inhibits protein synthesis and promotes arsenite- and pateamine A-induced assembly of stress granules (SGs). These effects are abrogated in cells transfected with the ANG inhibitor RNH1. Transfection of natural or synthetic 5'- but not 3'-tRNA fragments (tRNA-derived stress-induced RNAs; tiRNAs) induces the phospho-eukaryotic translation initiation factor 2alpha-independent assembly of SGs. Natural 5'-tiRNAs but not 3'-tiRNAs are capped with a 5'-monophosphate that is required for optimal SG assembly. These findings reveal that SG assembly is a component of the ANG- and tiRNA-induced stress response program.

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