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Specificities and redundancies in the NEL family of bacterial E3 ubiquitin ligases of Salmonella enterica serovar Typhimurium.
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- Author(s): Bullones-Bolaños A;Bullones-Bolaños A; Martín-Muñoz P; Martín-Muñoz P; Vallejo-Grijalba C; Vallejo-Grijalba C; Bernal-Bayard J; Bernal-Bayard J; Ramos-Morales F; Ramos-Morales F
- Source:
Frontiers in immunology [Front Immunol] 2024 Feb 01; Vol. 15, pp. 1328707. Date of Electronic Publication: 2024 Feb 01 (Print Publication: 2024).- Publication Type:
Journal Article; Research Support, Non-U.S. Gov't- Language:
English - Source:
- Additional Information
- Source: Publisher: Frontiers Research Foundation] Country of Publication: Switzerland NLM ID: 101560960 Publication Model: eCollection Cited Medium: Internet ISSN: 1664-3224 (Electronic) Linking ISSN: 16643224 NLM ISO Abbreviation: Front Immunol Subsets: MEDLINE
- Publication Information: Original Publication: [Lausanne : Frontiers Research Foundation]
- Subject Terms:
- Abstract: Salmonella enterica serovar Typhimurium expresses two type III secretion systems, T3SS1 and T3SS2, which are encoded in Salmonella pathogenicity island 1 (SPI1) and SPI2, respectively. These are essential virulent factors that secrete more than 40 effectors that are translocated into host animal cells. This study focuses on three of these effectors, SlrP, SspH1, and SspH2, which are members of the NEL family of E3 ubiquitin ligases. We compared their expression, regulation, and translocation patterns, their role in cell invasion and intracellular proliferation, their ability to interact and ubiquitinate specific host partners, and their effect on cytokine secretion. We found that transcription of the three genes encoding these effectors depends on the virulence regulator PhoP. Although the three effectors have the potential to be secreted through T3SS1 and T3SS2, the secretion of SspH1 and SspH2 is largely restricted to T3SS2 due to their expression pattern. We detected a role for these effectors in proliferation inside fibroblasts that is masked by redundancy. The generation of chimeric proteins allowed us to demonstrate that the N-terminal part of these proteins, containing the leucine-rich repeat motifs, confers specificity towards ubiquitination targets. Furthermore, the polyubiquitination patterns generated were different for each effector, with Lys48 linkages being predominant for SspH1 and SspH2. Finally, our experiments support an anti-inflammatory role for SspH1 and SspH2.
Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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J Biol Chem. 2009 Oct 2;284(40):27587-95. (PMID: 19690162) - Contributed Indexing: Keywords: E3 ubiquitin ligase; Salmonella enterica; SlrP; SspH1; SspH2; type III secretion systems
- Accession Number: EC 2.3.2.27 (Ubiquitin-Protein Ligases)
0 (Bacterial Proteins) - Publication Date: Date Created: 20240216 Date Completed: 20240219 Latest Revision: 20240406
- Publication Date: 20240407
- Accession Number: PMC10867120
- Accession Number: 10.3389/fimmu.2024.1328707
- Accession Number: 38361917
- Source:
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