Abstract
Natural transformation mechanisms have been studied across several bacterial systems, but few examples of inhibition exist. This work investigates the mechanism of action of a plasmid-encoded transmembrane inhibitor of natural transformation. The data reveal that the peptide can cause cell permeabilization. Permeabilization is synergistic with entry of Bacillus subtilis into the "competent" state, such that cells with the ability to be transformed are preferentially killed. These findings reveal a self-preservation mechanism coupled to the physiological state of the cells that ensures that the population can maintain an unaltered plasmid and its predicted prophage.
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