Transfer RNA instability as a stress response in Escherichia coli: rapid dynamics of the tRNA pool as a function of demand

Michael Askvad Sørensen; Annaleigh Ohrt Fehler; Sine Lo Svenningsen

doi:10.1080/15476286.2017.1391440

Transfer RNA instability as a stress response in Escherichia coli: rapid dynamics of the tRNA pool as a function of demand

Michael Askvad Sørensen, Annaleigh Ohrt Fehler, Sine Lo Svenningsen

12 Citations (Scopus)

62 Downloads (Pure)

Abstract

Production of the translation apparatus of E. coli is carefully matched to the demand for protein synthesis posed by a given growth condition. For example, the fraction of RNA polymerases that transcribe rRNA and tRNA drops from 80% during rapid growth to 24% within minutes of a sudden amino acid starvation. We recently reported in Nucleic Acids Research that the tRNA pool is more dynamically regulated than previously thought. In addition to the regulation at the level of synthesis, we found that tRNAs are subject to demand-based regulation at the level of their degradation. In this point-of-view article we address the question of why this phenomenon has not previously been described. We also present data that expands on the mechanism of tRNA degradation, and we discuss the possible implications of tRNA instability for the ability of E. coli to cope with stresses that affect the translation process.

Original language	English
Journal	RNA Biology
Volume	15
Issue number	4/5
Pages (from-to)	586-593
Number of pages	8
ISSN	1547-6286
DOIs	https://doi.org/10.1080/15476286.2017.1391440
Publication status	Published - 4 May 2018

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Transfer RNA instability as a stress response in Escherichia coli: rapid dynamics of the tRNA pool as a function of demand

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