西亚试剂：Chimeric tRNAs as tools to induce proteome damage and ident

Chimeric tRNAs as tools to induce proteome damage and identify components of stress responses

Renaud Geslain1, Laia Cubells1, Teresa Bori-Sanz2, Roberto álvarez-Medina3, David Rossell1, Elisa Martí3 and Lluís Ribas de Pouplana1,4,*

1Institute for Research in Biomedicine (IRB), 2Omnia Molecular, Barcelona Science Park, 3Instituto de Biología Molecular de Barcelona, CSIC, Parc Cientific de Barcelona, c/Baldiri Reixac 15-21, Barcelona 08028 and 4Catalan Institution for Research and Advanced Studies (ICREA), Passeig Lluís Companys 23, 08010 Barcelona, Spain

Misfolded proteins are caused by genomic mutations, aberrant splicing events, translation errors or environmental factors. The accumulation of misfolded proteins is a phenomenon connected to several human disorders, and is managed by stress responses specific to the cellular compartments being affected. In wild-type cells these mechanisms of stress response can be experimentally induced by expressing recombinant misfolded proteins or by incubating cells with large concentrations of amino acid analogues. Here, we report a novel approach for the induction of stress responses to protein aggregation. Our method is based on engineered transfer RNAs that can be expressed in cells or tissues, where they actively integrate in the translation machinery causing general proteome substitutions. This strategy allows for the introduction of mutations of increasing severity randomly in the proteome, without exposing cells to unnatural compounds. Here, we show that this approach can be used for the differential activation of the stress response in the Endoplasmic Reticulum (ER). As an example of the applications of this method, we have applied it to the identification of human microRNAs activated or repressed during unfolded protein stress.

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