Podoviridae

The virus family Podoviridae includes bacteriophages of order Caudovirales with linear, double-stranded DNA genome of 16-70 kbp length, a 50-70 nm in diameter icosahedral capsid great with a short, non- contractile tail of about 20x8 nm are depending on the genus located at the tail part six short tail fibers or several short extensions ( spikes ). This short tail is characteristic of the Podoviridae within the order Caudovirales, hence the name derives from the Greek for the family podos ( ποδός ) for " foot" from.

The genera within the Podoviridae differ in the organization of the genome, the mechanisms of DNA packaging and the presence of a DNA polymerase. The species of the genus Φ29 -like viruses have an elongated, non- isometric capsid, in contrast to the other.

In addition to the current four genera, the family Podoviridae also includes 33 other species that are not assigned to any genus.

System

The Podoviridae family includes the following genera and species classified:

• Genus T7 -like viruses (3 species, 16 provisional species) Species Enterobacteria phage T7 ( T7 phage )
• Species Kluyvera phage Kvp1
• Species Pseudomonas phage gh -1

• Species Enterobacteria phage P22

• Species Bacillus phage Φ29
• Species Kurthia phage 6
• Species Streptococcus phage Cp -1

• Species Enterobacteria phage N4 (E. coli bacteriophage N4)

Special

The genus Φ29 -like viruses having a analogous to the Adenoviridae and Tectiviridae bound to the genome terminal protein, which is the start of DNA replication (protein - priming ). The Φ29 -like viruses encode a DNA polymerase type B, the E. coli polymerase II is homologous.