Botourmiaviridae

Botourmiaviridae is a family of positive-strand RNA viruses which infect plants and fungi.[1] The family includes four genera: Ourmiavirus, Botoulivirus, Magoulivirus and Scleroulivirus. Members of genus Ourmiavirus infect plants and the other genera infect fungi. The member viruses have genomes which range from 2900 to 4800 nucleotides.[2]

Botourmiaviridae
Botourmiavirus genomes (three members only encode RdRp)
Virus classification Edit this classification
(unranked): Virus
Realm: Riboviria
Kingdom: Orthornavirae
Phylum: Lenarviricota
Class: Miaviricetes
Order: Ourlivirales
Family: Botourmiaviridae

Structure

Ourmiaviruses are the only members of the family that have a viral structure. The other members are naked and have no viral envelope or capsid. Ourmiaviruses are plant viruses that have a bacilliform virion composed of a single capsid protein. The virions have a series of discrete lengths from 30 to 62 nm.[2]

Genome

Members of the family Botourmiaviridae have positive-sense, single-stranded RNA genomes. Contrary to the hosts they infect (plants and fungus), their genome is concise and has few redundancies.[3] The genome of the genus Ourmiavirus has three segments that encode the capside protein (CP), movement protein (MP), and RNA-dependent RNA polymerase (RdRp). The length of the genome is around 4800 nucleotides. The genomes of the other three genera of the family are nonsegmented and have lengths which range from 2000 to 3200 nucleotides. The genomes of these fungal viruses only encode an RNA-dependent RNA polymerase and have no structural proteins.[2]

Taxonomy

The family has six genera:[2]

  • Botoulivirus
  • Magoulivirus
  • Ourmiavirus
  • Penoulivirus
  • Rhizoulivirus
  • Scleroulivirus

References
  1. Ayllón MA, Turina M, Xie J, Nerva L, Marzano SL, Donaire L, et al. (May 2020). "ICTV Virus Taxonomy Profile: Botourmiaviridae". The Journal of General Virology. 101 (5): 454–455. doi:10.1099/jgv.0.001409. PMC 7414452. PMID 32375992.
  2. "Family:Botourmiaviridae". ICTV Report Botourmiaviridae.
  3. Silva JM, Pratas D, Caetano T, Matos S (August 2022). "The complexity landscape of viral genomes". GigaScience. 11. doi:10.1093/gigascience/giac079. PMC 9366995. PMID 35950839.
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