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Pré-Publication, Document De Travail Année : 2022

sRNA-controlled iron sparing response in Staphylococci

Rodrigo Coronel-Tellez
Brice Felden
Bruno Sargueil

Résumé

ABSTRACT Staphylococcus aureus , a human opportunist pathogen, adjusts its metabolism to cope with iron deprivation within the host. We investigated the potential role of small non-coding RNAs (sRNAs) in dictating this process. A single sRNA, named here IsrR, emerged from a competition assay with tagged-mutant libraries as being required during iron starvation. IsrR is iron-repressed and predicted to target mRNAs expressing iron-containing enzymes. Among them, we demonstrated that IsrR down-regulates the translation of mRNAs of enzymes that catalyze anaerobic nitrate respiration. The IsrR sequence reveals three single-stranded C-rich regions (CRRs). Mutational and structural analysis indicated a differential contribution of these CRRs according to targets. We also report that IsrR is required for full lethality of S. aureus in a mouse septicemia model, underscoring its role as a major contributor to the iron-sparing response for bacterial survival during infection. IsrR is conserved among staphylococci, but it is not ortholog to the proteobacterial sRNA RyhB, nor to other characterized sRNAs down-regulating mRNAs of iron-containing enzymes. Remarkably, these distinct sRNAs regulate common targets, illustrating that RNA-based regulation provides optimal evolutionary solutions to improve bacterial fitness when iron is scarce.

Dates et versions

hal-03775296 , version 2 (12-09-2022)
hal-03775296 , version 1 (13-11-2022)

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Rodrigo Coronel-Tellez, Mateusz Pospiech, Maxime Barrault, Wenfeng Liu, Valérie Bordeau, et al.. sRNA-controlled iron sparing response in Staphylococci. 2022. ⟨hal-03775296v1⟩
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