Fromanvirus


Fromanvirus is a genus of viruses in the class Caudoviricetes, unassigned to a family. Bacteria serve as natural hosts, with transmission achieved through passive diffusion. There are 39 species in this genus.

Taxonomy

The following species are recognized:Fromanvirus almaFromanvirus astroFromanvirus bethlehemFromanvirus billknucklesFromanvirus bpbiebs31Fromanvirus brunsFromanvirus Bxb1Fromanvirus Che12Mycobacterium [virus D29|Fromanvirus D29]Fromanvirus doomFromanvirus euphoriaFromanvirus georgeFromanvirus gooseFromanvirus jasperFromanvirus JC27Fromanvirus KBGFromanvirus kssjebFromanvirus kugelFromanvirus L5Fromanvirus lesediFromanvirus lockleyFromanvirus marcellFromanvirus mrgordoFromanvirus museumFromanvirus nepalFromanvirus packmanFromanvirus perseusFromanvirus rebeucaFromanvirus redrockFromanvirus ridgecbFromanvirus saintusFromanvirus skipoleFromanvirus solonFromanvirus switzerFromanvirus SWU1Fromanvirus trixieFromanvirus twisterFromanvirus U2

Structure

Fromanviruses are nonenveloped, with a head and tail. The icosahedral head is about 60 nm in diameter, with covalently linked capsid proteins. The tail is long and flexible, at about 135 nm long, 8 nm wide, and has a terminal knob with one short tail fiber.
GenusStructureSymmetryCapsidGenomic arrangementGenomic segmentation
FromanvirusHead-TailT=7Non-envelopedLinearMonopartite

Genome

Bxb1, D29, and L5 and have been fully sequenced. They range between 49k and 53k nucleotides, with 79 to 90 proteins. Their complete genomes, and the genomes of many other species and unclassified viruses, are available via NCBI.

Life cycle

The virus attaches to the host cell's adhesion receptors using its terminal fiber, and ejects the viral DNA into the host cytoplasm via . Viral replication is cytoplasmic. Replication follows the replicative transposition model. DNA-templated transcription is the method of transcription. Once the viral genes have been replicated, the procapsid is assembled and packed. The tail is then assembled and the mature virions are released via lysis. Bacteria serve as the natural host. Transmission routes are passive diffusion.
GenusHost detailsTissue tropismEntry detailsRelease detailsReplication siteAssembly siteTransmission
FromanvirusBacteria-InjectionLysisCytoplasmCytoplasmPassive diffusion

History

According to ICTV's report, the genus L5likevirus was first accepted under the name L5-like phages, assigned only to family Siphoviridae. The whole family was moved to the newly created order Caudovirales in 1998, and the genus was renamed to L5-like viruses in ICTV's in 1999. In , the genus was renamed again, this time to L5likevirus. The genus was later renamed to Fromanvirus.