Enterobacteria phage P4 (also known as satellite phage P4) is a temperate bacteriophage of the family Myoviridae. It is a satellite virus, requiring P2-related helper phage to grow lytically.
The P4 virion has a tail and an icosohedral head containing a linear double-stranded DNA genome of 11,627 kb.
Phage P4 infects Escherichia coli. It is a satellite virus which cannot engage in lytic growth without the presence of a P2-related helper phage. It generally follows a lysogenic life cycle: after infection, the P4 genome integrates into that of its host. The P4 genome can also exist on its own within the host cell and can replicate as a free plasmid.
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