論文 - 詳細
| RRC ID | 5023 |
|---|---|
| 著者 | Dziewit L, Jazurek M, Drewniak L, Baj J, Bartosik D. |
| タイトル | The SXT conjugative element and linear prophage N15 encode toxin-antitoxin-stabilizing systems homologous to the tad-ata module of the Paracoccus aminophilus plasmid pAMI2. |
| ジャーナル | J Bacteriol |
| Abstract |
A group of proteic toxin-antitoxin (TA) cassettes whose representatives are widely distributed among bacterial genomes has been identified. These cassettes occur in chromosomes, plasmids, bacteriophages, and noncomposite transposons, as well as in the SXT conjugative element of Vibrio cholerae. The following four homologous loci were subjected to detailed comparative studies: (i) tad-ata from plasmid pAMI2 of Paracoccus aminophilus (the prototype of this group), (ii) gp49-gp48 from the linear bacteriophage N15 of Escherichia coli, (iii) s045-s044 from SXT, and (iv) Z3230-Z3231 from the genomic island of enterohemorrhagic Escherichia coli O157:H7 strain EDL933. Functional analysis revealed that all but one of these loci (Z3230-Z3231) are able to stabilize heterologous replicons, although the host ranges varied. The TA cassettes analyzed have the following common features: (i) the toxins are encoded by the first gene of each operon; (ii) the antitoxins contain a predicted helix-turn-helix motif of the XRE family; and (iii) the cassettes have two promoters that are different strengths, one which is located upstream of the toxin gene and one which is located upstream of the antitoxin gene. All four toxins tested are functional in E. coli; overexpression of the toxins (in the absence of antitoxin) results in a bacteriostatic effect manifested by elongation of bacterial cells and growth arrest. The toxins have various effects on cell viability, which suggests that they may recognize different intracellular targets. Preliminary data suggest that different cellular proteases are involved in degradation of antitoxins encoded by the loci analyzed. |
| 巻・号 | 189(5) |
| ページ | 1983-97 |
| 公開日 | 2007-3-1 |
| DOI | 10.1128/JB.01610-06 |
| PII | JB.01610-06 |
| PMID | 17158670 |
| PMC | PMC1855756 |
| MeSH | Antitoxins / genetics* Antitoxins / metabolism Bacterial Toxins / genetics* Base Sequence Conjugation, Genetic* DNA Transposable Elements* Escherichia coli / genetics Molecular Sequence Data Paracoccus / genetics* Plasmids* Promoter Regions, Genetic Prophages / genetics* Replicon Vibrio cholerae / genetics* |
| IF | 3.006 |
| 引用数 | 62 |
| WOS 分野 | MICROBIOLOGY |
| オルトメトリクス指標 |
オルトメトリクス指標項目
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| 最多言及媒体 | Patent(IFI CLAIMS) |
| 各媒体での言及数の合計 | 2 |
| 過去6か月間でのオルトメトリクス指標の変動値 | 0.0 |
| リソース情報 | |
| 一般微生物 | JCM7686 |