Listeria
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA300495 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR3108910_1.fastq.gz | Fastqsanger.gz | |||
| SRR3108910_2.fastq.gz | Fastqsanger.gz | |||
| SRR3108920_1.fastq.gz | Fastqsanger.gz | |||
| SRR3108920_2.fastq.gz | Fastqsanger.gz | |||
| SRR3108930_1.fastq.gz | Fastqsanger.gz |
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Project description:Listeria monocytogenes is a foodborne intracellular bacterial pathogen leading to human listeriosis. Despite a high mortality rate and increasing antibiotic resistance no clinically approved vaccine against Listeria is available. To identify antigens for this bacterial pathogen that can be encoded in mRNA vaccine formulations, we screened for Listeria epitopes presented on the surface of infected human cell lines by mass spectrometry-based immunopeptidomics. In between more than 15,000 human self-peptides, we detected 68 Listeria epitopes from 42 different bacterial proteins, including several known antigens. Peptide epitopes presented on different cell lines were often derived from the same bacterial surface proteins, classifying these antigens as potential vaccine candidates. Encoding these highly presented antigens in lipid nanoparticle mRNA vaccine formulations resulted in high levels of protection in vaccination challenge experiments in mice. Our results pave the way for the development of a clinical mRNA vaccine against Listeria and demonstrate the power of immunopeptidomics for next-generation bacterial vaccine development.
2022-09-26 | PXD031451 | Pride
Project description:Listeria monocytogenes is an opportunistic foodborne pathogen responsible for listeriosis, the third most common foodborne disease. Many different Listeria strains and seroptypes exist, however a proteogenomic resource which would provide a basis for bridging the gap in the molecular understanding between the Listeria genotype and phenotypes via proteotypes is still missing. Here we devised a next-generation proteogenomics strategy which enables the community now to rapidly proteotype Listeria strains and relate the information back to the genotype. Based on sequencing and de novo assembly of the two most commonly used Listeria strain model systems, EGD-e and ScottA, we established a comprehensive Listeria proteogenomic database. A genome comparison established core and strain-specific genes with potential relevance for virulence differences. Next we established a DIA/SWATH-based proteotyping strategy, including a new and robust sample preparation workflow, enabling the reproducible, sensitive and relative quantitative measurement of Listeria proteotypes. This re-usable DIA/SWATH library and new public resource covers 70% of the potentially expressed ORFs of Listeria and represents the most extensive spectral library for Listeria proteotype analysis to date. We used these two new resources to investigate the Listeria proteotype in three states mimicking the upper gastrointestinal passage. Exposure of Listeria to bile salts at 37 °C, mimicking conditions encountered in the duodenum, showed significant proteotype perturbations including an increase of FlaA, the structural protein of flagella. Given that Listeria is known to lose its flagella above 30 °C, this was an unexpected finding. The formation of flagella, which might have implications within the infectivity cycle, was validated by parallel reaction monitoring, light and scanning electron microscopy. QPCR data of flaA transcripts showed no significant differences suggesting a regulation at the post-transcriptional level. Together, we provide a comprehensive proteogenomic resource and toolbox for the Listeria community enabling the analysis of Listeria genotype-proteotype-phenotype relationships.
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Project description:ISG15 is primarily documented as an interferon-stimulated, ubiquitin-like protein (ubl), which has anti-viral activity. Although ISG15 was the founding member of the ubl protein family, very little is known about its function. We have found that ISG15 expression in non-phagocytic cells is dramatically induced upon Listeria infection and that surprisingly this induction can be Type I Interferon independent. Listeria-mediated ISG15 induction depends on the cytosolic surveillance pathway, which senses bacterial DNA and signals through STING, TBK1, IRF3 and IRF7. Most importantly, we observed that ISG15 expression restricts Listeria infection both in vitro and in vivo. We then made use of Stable Isotope Labeling in tissue culture (SILAC) to identify the ISGylated proteins that could be responsible for the ISG15-mediated protective effect. Our SILAC analysis revealed that overexpression of ISG15 leads to a striking ISGylation of integral membrane proteins of the endoplasmic reticulum and Golgi apparatus, which correlates with increased canonical secretion of cytokines. Taken together, our data reveal a previously uncharacterized signaling pathway that restricts Listeria infection and acts via ISGylation, reinforcing the view that ISG15 is a key component of the innate immune arsenal of the mammalian host.
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Project description:ISG15 is primarily documented as an interferon-stimulated, ubiquitin-like protein (ubl), which has anti-viral activity. Although ISG15 was the founding member of the ubl protein family, very little is known about its function. We have found that ISG15 expression in non-phagocytic cells is dramatically induced upon Listeria infection and that surprisingly this induction can be Type I Interferon independent. Listeria-mediated ISG15 induction depends on the cytosolic surveillance pathway, which senses bacterial DNA and signals through STING, TBK1, IRF3 and IRF7. Most importantly, we observed that ISG15 expression restricts Listeria infection both in vitro and in vivo. We then made use of Stable Isotope Labeling in tissue culture (SILAC) to identify the ISGylated proteins that could be responsible for the ISG15-mediated protective effect. Our SILAC analysis revealed that overexpression of ISG15 leads to a striking ISGylation of integral membrane proteins of the endoplasmic reticulum and Golgi apparatus, which correlates with increased canonical secretion of cytokines. Taken together, our data reveal a previously uncharacterized signaling pathway that restricts Listeria infection and acts via ISGylation, reinforcing the view that ISG15 is a key component of the innate immune arsenal of the mammalian host.
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Project description:Listeria monocytogenes is an opportunistic foodborne pathogen responsible for listeriosis, a potentially fatal foodborne disease. Many different Listeria strains and serotypes exist, buthowever a proteogenomic resource that which would allow to bridges the gap in ourthe molecular understanding of the relationships between the Listeria genotypes and phenotypes via proteotypes is still missing. Here we devised a next-generation proteogenomics strategy that enables the community now to rapidly proteotype Listeria strains and relate this information back to the genotype. Based on sequencing and de novo assembly of the two most commonly used Listeria model strains, EGD-e and ScottA, we established two comprehensive Listeria proteogenomic databases. A genome comparison established core- and strain-specific genes with potentially responsible relevance for virulence differences. Next, we established a DIA/SWATH-based proteotyping strategy, including a new and robust sample preparation workflow, that enablesing the reproducible, sensitive, and relatively quantitative measurement of Listeria proteotypes. This re-usable and publically available DIA/SWATH library and new public resource covers 70% of the potentially expressed open reading frames (ORFs) of Listeria and represents the most extensive spectral library for Listeria proteotype analysis to date. We used these two new resources to investigate the Listeria proteotype in three states mimicking the upper gastrointestinal passage. Exposure of Listeria to bile salts at 37 oC, which simulatesmimicking conditions encountered in the duodenum, showed significant proteotype perturbations including an increase of FlaA, the structural protein of flagella. Given that Listeria is known to lose its flagella above 30 oC, this was an unexpected finding. The formation of flagella, which might have implications onwithin the infectivity cycle, was validated by parallel reaction monitoring and, light and scanning electron microscopiesy. Q-PCR data of flaA transcripts levels were not impacted showed no significantly differentces with and without exposure to conditions mimicking the duodenum, suggesting a regulation at the post-transcriptional level. Together, these analyseswe provide a comprehensive proteogenomic resource and toolbox for the Listeria community enabling the analysis of Listeria genotype-proteotype-phenotype relationships.
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