Abstract
The surfactants tested in this study lysed Bacillus subtilis 168 cells at the logarithmic growth phase. Results obtained with inhibitors and a mutant that had defective autolytic enzymes suggested that cell lysis resulted from the deregulation of autolysin activity. The addition of surfactants at sublytic concentrations produced twisted cells, filamented cells, or both. Autolysins extracted with 5 M LiCl from the cell wall fraction and lysozyme added to cells that were treated with surfactants restored the apparently normal cell rod morphology, suggesting that surfactants interfere with the role of autolysins in normal construction of the cell envelope. The rates of cellular autolysis and autolysin activity remaining in growing cells after exposure to a surfactant at a sublytic concentration decreased, although the rate of turnover of cell wall peptidoglycan was the same as that of control cells. Surfactants were suggested to interact with the regulatory system of autolysins and, thus, to affect the activities of autolysins in B. subtilis cells and to cause either morphological changes or cell autolysis, depending on the concentration of surfactants.
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