Lederbergvirus
Lederbergvirus (synonyms "P22-like viruses", "P22-like phages", "P22likevirus") is a genus of virusesin the order "Caudovirales", in the family "Podoviridae". Bacteria serve as natural hosts, with transmission achieved through passive diffusion. There are six species in this genus. Taxonomy. The following six species are assigned to the genus: Structure. Lederbergviruses are nonenveloped, with a head and tail. The head is icosahedral with T=7 symmetry, with a diameter of approximately 60 to 65 nm. The tail is non-contractile with six prominent tail spikes. Genome. Several species have been fully sequenced. They range between 38k and 42k nucleotides, with  58 to 72 proteins. Complete genomes, as well as several similar unclassified strains are available from Life cycle. Viral replication is cytoplasmic. The virus attaches to the host cell using its terminal fibers, and ejects the viral DNA into the host periplasm. DNA-templated transcription is the method of transcription. Once the viral genes have been replicated, new virions are assembled in the host's cytoplasm, and mature virions are released via lysis and holin/endolysin/spanin proteins. History. According to ICTV's 1996 report, the genus "P22likevirus" was first accepted under the name "P22-like phages", assigned only to  family "Podoviridae". The whole family was moved to the newly created order "Caudovirales" in 1998, and the genus was renamed to "P22-like viruses" in ICTV's seventh report in 1999. In 2012, the genus was renamed again, this time to "P22likevirus". The genus was later renamed to Lederbergvirus.