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The rpoS gene confers resistance to low osmolarity conditions in Salmonella enterica serovar Typhi

Salmonella enterica serovars Typhimurium and Typhi are enteropathogens that differ in host range and the diseases that they cause. We found that exposure to a combination of hypotonicity and the detergent Triton X-100 significantly reduced the viability of the S. Typhi strain Ty2 but had no effect o...

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Autores principales: Gibbons, Eamon, Tamanna, Mehbooba, Cherayil, Bobby J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9757558/
https://www.ncbi.nlm.nih.gov/pubmed/36525423
http://dx.doi.org/10.1371/journal.pone.0279372
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author Gibbons, Eamon
Tamanna, Mehbooba
Cherayil, Bobby J.
author_facet Gibbons, Eamon
Tamanna, Mehbooba
Cherayil, Bobby J.
author_sort Gibbons, Eamon
collection PubMed
description Salmonella enterica serovars Typhimurium and Typhi are enteropathogens that differ in host range and the diseases that they cause. We found that exposure to a combination of hypotonicity and the detergent Triton X-100 significantly reduced the viability of the S. Typhi strain Ty2 but had no effect on the S. Typhimurium strain SL1344. Further analysis revealed that hypotonicity was the critical factor: incubation in distilled water alone was sufficient to kill Ty2, while the addition of sodium chloride inhibited killing in a dose-dependent manner. Ty2’s loss of viability in water was modified by culture conditions: bacteria grown in well-aerated shaking cultures were more susceptible than bacteria grown under less aerated static conditions. Ty2, like many S. Typhi clinical isolates, has an inactivating mutation in the rpoS gene, a transcriptional regulator of stress responses, whereas most S. Typhimurium strains, including SL1344, have the wild-type gene. Transformation of Ty2 with a plasmid expressing wild-type rpoS, but not the empty vector, significantly increased survival in distilled water. Moreover, an S. Typhi strain with wild-type rpoS had unimpaired survival in water. Inactivation of the wild-type gene in this strain significantly reduced survival, while replacement with an arabinose-inducible allele of rpoS restored viability in water under inducing conditions. Our observations on rpoS-dependent differences in susceptibility to hypotonic conditions may be relevant to the ability of S. Typhi and S. Typhimurium to tolerate the various environments they encounter during the infectious cycle. They also have implications for the handling of these organisms during experimental manipulations.
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spelling pubmed-97575582022-12-17 The rpoS gene confers resistance to low osmolarity conditions in Salmonella enterica serovar Typhi Gibbons, Eamon Tamanna, Mehbooba Cherayil, Bobby J. PLoS One Research Article Salmonella enterica serovars Typhimurium and Typhi are enteropathogens that differ in host range and the diseases that they cause. We found that exposure to a combination of hypotonicity and the detergent Triton X-100 significantly reduced the viability of the S. Typhi strain Ty2 but had no effect on the S. Typhimurium strain SL1344. Further analysis revealed that hypotonicity was the critical factor: incubation in distilled water alone was sufficient to kill Ty2, while the addition of sodium chloride inhibited killing in a dose-dependent manner. Ty2’s loss of viability in water was modified by culture conditions: bacteria grown in well-aerated shaking cultures were more susceptible than bacteria grown under less aerated static conditions. Ty2, like many S. Typhi clinical isolates, has an inactivating mutation in the rpoS gene, a transcriptional regulator of stress responses, whereas most S. Typhimurium strains, including SL1344, have the wild-type gene. Transformation of Ty2 with a plasmid expressing wild-type rpoS, but not the empty vector, significantly increased survival in distilled water. Moreover, an S. Typhi strain with wild-type rpoS had unimpaired survival in water. Inactivation of the wild-type gene in this strain significantly reduced survival, while replacement with an arabinose-inducible allele of rpoS restored viability in water under inducing conditions. Our observations on rpoS-dependent differences in susceptibility to hypotonic conditions may be relevant to the ability of S. Typhi and S. Typhimurium to tolerate the various environments they encounter during the infectious cycle. They also have implications for the handling of these organisms during experimental manipulations. Public Library of Science 2022-12-16 /pmc/articles/PMC9757558/ /pubmed/36525423 http://dx.doi.org/10.1371/journal.pone.0279372 Text en © 2022 Gibbons et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Gibbons, Eamon
Tamanna, Mehbooba
Cherayil, Bobby J.
The rpoS gene confers resistance to low osmolarity conditions in Salmonella enterica serovar Typhi
title The rpoS gene confers resistance to low osmolarity conditions in Salmonella enterica serovar Typhi
title_full The rpoS gene confers resistance to low osmolarity conditions in Salmonella enterica serovar Typhi
title_fullStr The rpoS gene confers resistance to low osmolarity conditions in Salmonella enterica serovar Typhi
title_full_unstemmed The rpoS gene confers resistance to low osmolarity conditions in Salmonella enterica serovar Typhi
title_short The rpoS gene confers resistance to low osmolarity conditions in Salmonella enterica serovar Typhi
title_sort rpos gene confers resistance to low osmolarity conditions in salmonella enterica serovar typhi
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9757558/
https://www.ncbi.nlm.nih.gov/pubmed/36525423
http://dx.doi.org/10.1371/journal.pone.0279372
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