The Psychrotrophic Pseudomonas lundensis, a Non-aeruginosa Pseudomonad, Has a Type III Secretion System of the Ysc Family, Which Is Transcriptionally Active at 37°C
The type III secretion system (T3SS) is a needle-like structure found in Gram-negative pathogens that directly delivers virulence factors like toxins and effector molecules into eukaryotic cells. The T3SS is classified into different families according to the type of effector and host. Of these, the...
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ftpubmed:oai:pubmedcentral.nih.gov:8903896 2023-05-15T13:43:28+02:00 The Psychrotrophic Pseudomonas lundensis, a Non-aeruginosa Pseudomonad, Has a Type III Secretion System of the Ysc Family, Which Is Transcriptionally Active at 37°C Ravi, Keerthikka Falkowski, Nicole R. Scales, Brittan S. Akulava, Volha D. Valentovich, Leonid N. Huffnagle, Gary B. 2022-02-22 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8903896/ http://www.ncbi.nlm.nih.gov/pubmed/35189702 https://doi.org/10.1128/mbio.03869-21 en eng American Society for Microbiology http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8903896/ http://www.ncbi.nlm.nih.gov/pubmed/35189702 http://dx.doi.org/10.1128/mbio.03869-21 Copyright © 2022 Ravi et al. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license (https://creativecommons.org/licenses/by/4.0/) . CC-BY mBio Research Article Text 2022 ftpubmed https://doi.org/10.1128/mbio.03869-21 2022-03-13T01:54:23Z The type III secretion system (T3SS) is a needle-like structure found in Gram-negative pathogens that directly delivers virulence factors like toxins and effector molecules into eukaryotic cells. The T3SS is classified into different families according to the type of effector and host. Of these, the Ysc family T3SS, found in Yersinia species and Pseudomonas aeruginosa, confers high virulence to bacteria against eukaryotic hosts. Here, we present the first identification and transcriptional analyses of a Ysc T3SS in a non-aeruginosa Pseudomonas species, Pseudomonas lundensis, an environmental psychrotrophic bacterium and important agent of frozen food spoilage. We have identified and sequenced isolates of P. lundensis from three very distinct ecological niches (Antarctic temporary meltwater pond, U.S. supermarket 1% pasteurized milk, and cystic fibrosis lungs) and compared these to previously reported food spoilage isolates in Europe. In this paper, we show that strains of P. lundensis isolated from these diverse environments with ambient temperatures ranging from below freezing to 37°C all possess a Ysc family T3SS secretion system and a T3S effector, ExoU. Using in vitro and in vivo transcriptomics, we show that the T3SS in P. lundensis is transcriptionally active, is expressed more highly at mammalian body temperature (37°C) than 4°C, and has even higher expression levels when colonizing a host environment (mouse intestine). Thus, this Ysc T3SS-expressing psychrotrophic Pseudomonad has an even greater range of growth niches than previously appreciated, including diseased human airways. Text Antarc* Antarctic PubMed Central (PMC) Antarctic mBio 13 1 |
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Research Article Ravi, Keerthikka Falkowski, Nicole R. Scales, Brittan S. Akulava, Volha D. Valentovich, Leonid N. Huffnagle, Gary B. The Psychrotrophic Pseudomonas lundensis, a Non-aeruginosa Pseudomonad, Has a Type III Secretion System of the Ysc Family, Which Is Transcriptionally Active at 37°C |
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The type III secretion system (T3SS) is a needle-like structure found in Gram-negative pathogens that directly delivers virulence factors like toxins and effector molecules into eukaryotic cells. The T3SS is classified into different families according to the type of effector and host. Of these, the Ysc family T3SS, found in Yersinia species and Pseudomonas aeruginosa, confers high virulence to bacteria against eukaryotic hosts. Here, we present the first identification and transcriptional analyses of a Ysc T3SS in a non-aeruginosa Pseudomonas species, Pseudomonas lundensis, an environmental psychrotrophic bacterium and important agent of frozen food spoilage. We have identified and sequenced isolates of P. lundensis from three very distinct ecological niches (Antarctic temporary meltwater pond, U.S. supermarket 1% pasteurized milk, and cystic fibrosis lungs) and compared these to previously reported food spoilage isolates in Europe. In this paper, we show that strains of P. lundensis isolated from these diverse environments with ambient temperatures ranging from below freezing to 37°C all possess a Ysc family T3SS secretion system and a T3S effector, ExoU. Using in vitro and in vivo transcriptomics, we show that the T3SS in P. lundensis is transcriptionally active, is expressed more highly at mammalian body temperature (37°C) than 4°C, and has even higher expression levels when colonizing a host environment (mouse intestine). Thus, this Ysc T3SS-expressing psychrotrophic Pseudomonad has an even greater range of growth niches than previously appreciated, including diseased human airways. |
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Text |
author |
Ravi, Keerthikka Falkowski, Nicole R. Scales, Brittan S. Akulava, Volha D. Valentovich, Leonid N. Huffnagle, Gary B. |
author_facet |
Ravi, Keerthikka Falkowski, Nicole R. Scales, Brittan S. Akulava, Volha D. Valentovich, Leonid N. Huffnagle, Gary B. |
author_sort |
Ravi, Keerthikka |
title |
The Psychrotrophic Pseudomonas lundensis, a Non-aeruginosa Pseudomonad, Has a Type III Secretion System of the Ysc Family, Which Is Transcriptionally Active at 37°C |
title_short |
The Psychrotrophic Pseudomonas lundensis, a Non-aeruginosa Pseudomonad, Has a Type III Secretion System of the Ysc Family, Which Is Transcriptionally Active at 37°C |
title_full |
The Psychrotrophic Pseudomonas lundensis, a Non-aeruginosa Pseudomonad, Has a Type III Secretion System of the Ysc Family, Which Is Transcriptionally Active at 37°C |
title_fullStr |
The Psychrotrophic Pseudomonas lundensis, a Non-aeruginosa Pseudomonad, Has a Type III Secretion System of the Ysc Family, Which Is Transcriptionally Active at 37°C |
title_full_unstemmed |
The Psychrotrophic Pseudomonas lundensis, a Non-aeruginosa Pseudomonad, Has a Type III Secretion System of the Ysc Family, Which Is Transcriptionally Active at 37°C |
title_sort |
psychrotrophic pseudomonas lundensis, a non-aeruginosa pseudomonad, has a type iii secretion system of the ysc family, which is transcriptionally active at 37°c |
publisher |
American Society for Microbiology |
publishDate |
2022 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8903896/ http://www.ncbi.nlm.nih.gov/pubmed/35189702 https://doi.org/10.1128/mbio.03869-21 |
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Antarc* Antarctic |
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mBio |
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8903896/ http://www.ncbi.nlm.nih.gov/pubmed/35189702 http://dx.doi.org/10.1128/mbio.03869-21 |
op_rights |
Copyright © 2022 Ravi et al. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International license (https://creativecommons.org/licenses/by/4.0/) . |
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https://doi.org/10.1128/mbio.03869-21 |
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