Endoribonuclease-mediated Control of Hns MRNA Stability Constitutes a Key Regulatory Pathway for Salmonella Typhimurium Pathogenicity Island 1 Expression

Overview

Journal PLoS Pathog

Specialty Microbiology

Date 2021 Feb 1

PMID 33524062

Citations 7

Authors

Minho Lee

Minkyung Ryu

Minju Joo

Young-Jin Seo

Jaejin Lee

Hong-Man Kim

Eunkyoung Shin

Ji-Hyun Yeom

Yong-Hak Kim

Jeehyeon Bae

Kangseok Lee

Affiliations

Soon will be listed here.

Abstract

Bacteria utilize endoribonuclease-mediated RNA processing and decay to rapidly adapt to environmental changes. Here, we report that the modulation of hns mRNA stability by the endoribonuclease RNase G plays a key role in Salmonella Typhimurium pathogenicity. We found that RNase G determines the half-life of hns mRNA by cleaving its 5' untranslated region and that altering its cleavage sites by genome editing stabilizes hns mRNA, thus decreasing S. Typhimurium virulence in mice. Under anaerobic conditions, the FNR-mediated transcriptional repression of rnc encoding RNase III, which degrades rng mRNA, and simultaneous induction of rng transcription resulted in rapid hns mRNA degradation, leading to the derepression of genes involved in the Salmonella pathogenicity island 1 (SPI-1) type III secretion system (T3SS). Together, our findings show that RNase III and RNase G levels-mediated control of hns mRNA abundance acts as a regulatory pathway upstream of a complex feed-forward loop for SPI-1 expression.

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