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| Leviviricetes | |
|---|---|
Virus classification  | |
| (unranked): | Virus |
| Realm: | Riboviria |
| Kingdom: | Orthornavirae |
| Phylum: | Lenarviricota |
| Class: | Leviviricetes |
Leviviricetes is a class of viruses, which infect prokaryotes. Most of these bacteriophages were discovered by metagenomics. [1]
Leviviricetes contains two orders and nine genera unassigned to an order. This is shown hereafter: [2]
Orders:
Unassigned genera:
An RNA virus is a virus—other than a retrovirus—that has ribonucleic acid (RNA) as its genetic material. The nucleic acid is usually single-stranded RNA (ssRNA) but it may be double-stranded (dsRNA). Notable human diseases caused by RNA viruses include the common cold, influenza, SARS, MERS, Covid-19, Dengue Virus, hepatitis C, hepatitis E, West Nile fever, Ebola virus disease, rabies, polio, mumps, and measles.
Fiersviridae is a family of positive-strand RNA viruses which infect prokaryotes. Bacteria serve as the natural host. They are small viruses with linear, positive-sense, single-stranded RNA genomes that encode four proteins. All phages of this family require bacterial pili to attach to and infect cells. The family has 185 genera, most discovered by metagenomics. In 2020, the family was renamed from Leviviridae to its current name.
Luteoviridae was a family of viruses. The family was abolished in 2020 based on evidence that its three genera and seven species unassigned to a genus belonged to two other, existing families.
Betaflexiviridae is a family of viruses in the order Tymovirales. Plants and fungi serve as natural hosts. There are 108 species in this family, assigned to 13 genera in two subfamilies. Diseases associated with this family include mosaic and ringspot symptoms.
Secoviridae is a family of viruses in the order Picornavirales. Plants serve as natural hosts. There are 8 genera and 86 species in this family, one of which is unassigned to a genus. The family was created in 2009 with the grouping of families Sequiviridae, now dissolved, and Comoviridae, now subfamily Comovirinae, along with the then unassigned genera Cheravirus, Sadwavirus, and Torradovirus.
Riboviria is a realm of viruses that includes all viruses that use a homologous RNA-dependent polymerase for replication. It includes RNA viruses that encode an RNA-dependent RNA polymerase, as well as reverse-transcribing viruses that encode an RNA-dependent DNA polymerase. RNA-dependent RNA polymerase (RdRp), also called RNA replicase, produces RNA from RNA. RNA-dependent DNA polymerase (RdDp), also called reverse transcriptase (RT), produces DNA from RNA. These enzymes are essential for replicating the viral genome and transcribing viral genes into messenger RNA (mRNA) for translation of viral proteins.
Tectiliviricetes is a class of viruses.
Lenarviricota is a phylum of RNA viruses that includes all positive-strand RNA viruses that infect prokaryotes. Some members also infect eukaryotes. Most of these viruses do not have capsids, except for the genus Ourmiavirus. The name of the group is a syllabic abbreviation of the names of founding member families "Leviviridae and Narnaviridae" with the suffix -viricota, denoting a virus phylum.
Solemoviridae is a family of non-enveloped, positive-strand RNA viruses which infect plants. Solemoviridae is a member of the order Sobelivirales.
Herelleviridae is a family of bacterial viruses of the order Caudovirales infecting members of the phylum Firmicutes. The family has five subfamilies, 33 genera and 92 species.
Naldaviricetes is a class of viruses, which infect arthropods. Members of Naldaviricetes are characterized by large enveloped rod-shaped virions, circular double-stranded DNA genomes, and replication in the nucleus of the host cell. All of them share a set of unique genes not found in other viruses, which include the presence of multiple interspersed direct repeats, various subunits of DNA polymerase and RNA polymerase, four late expression factor genes, and infectivity factor genes suggesting a common host entry mechanism.
Norzivirales is an order of viruses, which infect prokaryotes. Most of these bacteriophages were discovered by metagenomics.
Atkinsviridae is a family of RNA viruses, which infect prokaryotes.
Solspiviridae is a family of RNA viruses, which infect prokaryotes.
Steitzviridae is a family of RNA viruses, which infect prokaryotes.
Blumeviridae is a family of RNA viruses, which infect prokaryotes.
Duinviridae is a family of RNA viruses, which infect prokaryotes.
Timlovirales is an order of viruses, which infect prokaryotes. Most of these bacteriophages were discovered by metagenomics.
Bacteriophage φCb5 is a bacteriophage that infects Caulobacter bacteria and other caulobacteria. The bacteriophage was discovered in 1970, it belongs to the genus Cebevirus of the Steitzviridae family and is the type species of the family. The bacteriophage is widely distributed in the soil, freshwater lakes, streams and seawater, places where caulobacteria inhabit and can be sensitive to salinity.
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