Enterobacteria phage P4

Enterobacteria phage P4 (also known as satellite phage P4) is a temperate bacteriophage strain of species Escherichia virus P2 within genus Peduovirus (formerly P2-like viruses, P2virus, and P2likevirus), subfamily Peduovirinae, family Myoviridae.^[1] It is a satellite virus, requiring P2-related helper phage to grow lytically.

Enterobacteria phage P4
Virus classification
(unranked):	Virus
Realm:	Duplodnaviria
Kingdom:	Heunggongvirae
Phylum:	Uroviricota
Class:	Caudoviricetes
Family:	Peduoviridae
Genus:	Peduovirus
Species:	Escherichia virus P2
Strain:	Enterobacteria phage P4

Structure

The P4 virion has a tail and an icosahedral head containing a linear double-stranded DNA genome of 11,627 kb.^[2][3]

Life cycle

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.^[4]