ArticleFEMS microbiology reviews2023
Type II bacterial toxin-antitoxins: hypotheses, facts, and the newfound plethora of the PezAT system.
Article in FEMS microbiology reviews, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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10 citing papers in PubMed, 19 citations in OpenAlex.
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- XRE-type transcriptional regulator ProR controls prodigiosin synthesis inSynthetic and systems biotechnology · 2026Article
- Modulation of Hachiman defence by a type II toxin-antitoxin system via balancing trade-off between the fitness cost and antiphage activity.Engineering microbiology · 2026Article
- Battle beyond membrane: flagella as a conduit for phage DNA entry and a trigger for bacterial defense in Yersinia enterocolitica.Nucleic acids research · 2025Article
- Toxin-antitoxins and sigma factors may optimize the fitness of free-living bacteria throughout the life cycle via an integrated nutrient-responsive cybernetic system.Journal of the Royal Society, Interface · 2025Review
- Structure, Function, and Regulation of LytA: TheMicroorganisms · 2025Review
- Analysis of co-occurrence of type II toxin-antitoxin systems and antibiotic resistance determinants inmSystems · 2025Article
- Genome-wide screen overexpressing mycobacteriophage Amelie genes identifies multiple inhibitors of mycobacterial growth.G3 (Bethesda, Md.) · 2025Article
- The SpxA1-TenA toxin-antitoxin system regulates epigenetic variations of Streptococcus pneumoniae by targeting protein synthesis.PLoS pathogens · 2024Article
- Type II and IV toxin-antitoxin systems coordinately stabilize the integrative and conjugative element of the ICESa2603 family conferring multiple drug resistance in Streptococcus suis.PLoS pathogens · 2024Article
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Authors and funding
4 authors at 3 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Toxin-antitoxin (TA) systems are entities found in the prokaryotic genomes, with eight reported types. Type II, the best characterized, is comprised of two genes organized as an operon. Whereas toxins impair growth, the cognate antitoxin neutralizes its activity. TAs appeared to be involved in plasmid maintenance, persistence, virulence, and defence against bacteriophages. Most Type II toxins target the bacterial translational machinery. They seem to be antecessors of Higher Eukaryotes and Prokaryotes Nucleotide-binding (HEPN) RNases, minimal nucleotidyltransferase domains, or CRISPR-Cas systems. A total of four TAs encoded by Streptococcus pneumoniae, RelBE, YefMYoeB, Phd-Doc, and HicAB, belong to HEPN-RNases. The fifth is represented by PezAT/Epsilon-Zeta. PezT/Zeta toxins phosphorylate the peptidoglycan precursors, thereby blocking cell wall synthesis. We explore the body of knowledge (facts) and hypotheses procured for Type II TAs and analyse the data accumulated on the PezAT family. Bioinformatics analyses showed that homologues of PezT/Zeta toxin are abundantly distributed among 14 bacterial phyla mostly in Proteobacteria (48%), Firmicutes (27%), and Actinobacteria (18%), showing the widespread distribution of this TA. The pezAT locus was found to be mainly chromosomally encoded whereas its homologue, the tripartite omega-epsilon-zeta locus, was found mostly on plasmids. We found several orphan pezT/zeta toxins, unaccompanied by a cognate antitoxin.
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