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- W2154008155 abstract "The toxin–antitoxin operon of pSM19035 encodes three proteins: the ω global regulator, the ε labile antitoxin and the stable ζ toxin. Accumulation of ζ toxin free of ε antitoxin induced loss of cell proliferation in both Bacillus subtilis and Escherichia coli cells. Induction of a ζ variant ( ζ Y83C) triggered stasis, in which B. subtilis cells were viable but unable to proliferate, without selectively affecting protein translation. In E. coli cells, accumulation of free ζ toxin induced stasis, but this was fully reversed by expression of the ε antitoxin within a defined time window. The time window for reversion of ζ toxicity by expression of ε antitoxin was dependent on the initial cellular level of ζ . After 240 min of constitutive expression, or inducible expression of high levels of ζ toxin for 30 min, expression of ε failed to reverse the toxic effect exerted by ζ in cells growing in minimal medium. Under the latter conditions, ζ inhibited replication, transcription and translation and finally induced death in a fraction (∼50 %) of the cell population. These results support the view that ζ interacts with its specific target and reversibly inhibits cell proliferation, but accumulation of ζ might lead to cell death due to pleiotropic effects." @default.
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- W2154008155 date "2006-08-01" @default.
- W2154008155 modified "2023-10-18" @default.
- W2154008155 title "pSM19035-encoded ζ toxin induces stasis followed by death in a subpopulation of cells" @default.
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- W2154008155 doi "https://doi.org/10.1099/mic.0.28950-0" @default.
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