Abstract

After infection of sensitive cells in the absence of a helper phage, the satellite bacteriophage P4 enters a temporary phase of uncommitted replication followed by commitment to either the repressed-integrated condition or the derepressed-high copy number mode of replication. The transient phase and the stable plasmid condition differ from each other in the pattern of protein synthesis, in the rate of P4 DNA replication and in the expression of some gene functions. The regulatory condition characteristic of the P4 plasmid state affects a superinfecting genome, preventing the establishment of the P4 immune condition.

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