Is abortive infection by bacteriophage BF23 of Escherichia coli harboring ColIb plasmids due to cell killing by internally liberated colicin Ib?

Infection of Escherichia coli harboring ColIb+ plasmids with bacteriophage BF23+ is abortive and resulted in changes of membrane permeability as measured by efflux of nucleotides and K+. A single pre-early gene product of BF23+ was necessary and sufficient to elicit the abortive response. Appropriate mutations in this pre-early gene allowed a productive infection in ColIb+ cells. Appropriate mutations in the ColIb plasmid also allowed a productive infection with BF23+. A comparison of changes occurring during abortive infection and during killing of sensitive cells by external colicin Ib or Ia, together with certain genetic data, has led to the conclusion that membrane changes accompanying the two phenomena are the result of a common mechanism, namely, the interaction of free colicin with the cytoplasmic membrane.

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