Viral genome ejection through host cell envelope

Tailed bacterial viruses possess are able to enter bacterias by piercing host envelope with their tail. The latter can be long and contractile (e.g. Myoviridae), long and flexible (e.g. Siphoviridae) or short(e.g. Podoviridae).

noncontractile long noncontractile contractile

Delivery into the cell cytoplasm requires ejection of the viral genome from the icosahedral capsid through the tail tube and/or a channel .