[No authors listed]
SpoIISAB is a toxin-antitoxin module encoded on the chromosomes of Bacillus subtilis and related Bacilli species. The SpoIISA toxin was previously shown to target the cytoplasmic membrane and to induce lysis in both B. subtilis and Escherichia coli; however, the precise manner of SpoIISA toxicity remains unknown. In this work, we focused on the N-terminal, transmembrane domain of SpoIISA and verified the prediction of its topology. Using truncated SpoIISA constructs, we show that the entire transmembrane domain is required for its toxicity. Moreover, we propose that the oligomerization of this transmembrane domain is crucial for activity of SpoIISA, possibly by forming a pore-like structure.
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