1887

Abstract

SUMMARY: The susceptibilities to a series of colicins of B, two strains and their respective stable L-forms were compared. Certain stable L-forms are known to be completely devoid of their cell walls and consequently are completely phage-resistant. Nevertheless, such L-forms show the same or even higher degrees of susceptibility to colicins than do their parent bacteria; they also display exactly the same specific patterns of susceptibilities as do the corresponding normal bacillary forms. Colicins may become adsorbed directly to the cytoplasmic membranes of L-forms. The attachment of a colicin molecule to an adsorption site localized in the bacterial cell wall therefore cannot be regarded as a compulsory initial step leading to the killing of the cell (and the specificity of the interaction between colicins and bacterial cells cannot be determined by cell-wall receptors). Adsorption of colicins to (normal and L-forms) is not possible after killing them with formaldehyde. The time of rescue by trypsin of cells which have adsorbed colicin is decreased to zero with L-forms. Obviously, the ‘lethal’ adsorption of colicins is to receptors in the cytoplasmic membrane.

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/content/journal/micro/10.1099/00221287-52-2-161
1968-07-01
2022-01-20
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