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Adsorption of phages T4, T5, and BF23 to previously starved Escherichia coli cells triggered the immediate release of respiratory control. A similar stimulation of respiration was induced after T4 ghost attachment, showing that this process was independent of the mechanism of DNA injection. Rather, this change in the respiratory rate was related to the transient depolarization of the cytoplasmic membrane also induced after phage and ghost adsorption. Both processes were suppressed by addition of ethylene glycol-bis(beta-aminoethyl ether)-N,N,N',N'-tetraacetic acid in the case of T4 (phage and ghosts) but not of T5 and BF23. The increase in respiratory rate observed after phage adsorption was of a magnitude similar to that induced by protonophores. Since other treatments that depolarize the membrane without a massive proton influx did not increase the rate of respiration of starved bacteria with the same efficiency, these results suggest that phage adsorption induced an entry of protons into the cell cytoplasm.

Release of respiratory control in Escherichia coli after bacteriophage adsorption: process independent of DNA injection