Bromovirus

Bromovirus is a genus of viruses, in the family Bromoviridae.[3] Plants serve as natural hosts. There are six species in this genus.[2][4]

Bromovirus
Transmission electron micrograph of brome mosaic virus (BMV) virions
Crystal structure of Brome mosaic virus, PDB entry 1js9[1]
Virus classification
(unranked): Virus
Realm: Riboviria
Kingdom: Orthornavirae
Phylum: Kitrinoviricota
Class: Alsuviricetes
Order: Martellivirales
Family: Bromoviridae
Genus: Bromovirus
Species[2]
  • Broad bean mottle virus
  • Brome mosaic virus
  • Cassia yellow blotch virus
  • Cowpea chlorotic mottle virus
  • Melandrium yellow fleck virus
  • Spring beauty latent virus

Taxonomy

The following species are assigned to the genus:[2]

  • Broad bean mottle virus
  • Brome mosaic virus
  • Cassia yellow blotch virus
  • Cowpea chlorotic mottle virus
  • Melandrium yellow fleck virus
  • Spring beauty latent virus

Structure

Viruses in the genus Bromovirus are non-enveloped, with icosahedral geometries, and T=3 symmetry. The diameter is around 26 nm. Genomes are linear and segmented, tripartite.[2][4]

GenusStructureSymmetryCapsidGenomic arrangementGenomic segmentation
BromovirusIcosahedralT=3Non-envelopedLinearSegmented

Life cycle

Viral replication is cytoplasmic. Entry into the host cell is achieved by penetration into the host cell. Replication follows the positive stranded RNA virus replication model. Positive stranded rna virus transcription, using the internal initiation model of subgenomic RNA transcription is the method of transcription. The virus exits the host cell by tubule-guided viral movement. Plants serve as the natural host. Transmission routes are mechanical and contact.[2][4]

GenusHost detailsTissue tropismEntry detailsRelease detailsReplication siteAssembly siteTransmission
BromovirusPlantsNoneViral movement; mechanical inoculationViral movementCytoplasmCytoplasmMechanical inoculation: insects; contact

Recombination

Brome mosaic virus (BMV) genomes are able to undergo RNA-RNA homologous recombination upon infection of plant cells.[5] The RNA-dependent RNA polymerase specified by the BMV genome appears to undergo template switching (copy choice) recombination during viral RNA synthesis.[6]

References
  1. Lucas, R. W.; Larson, S. B.; McPherson, A. (2002). "The crystallographic structure of Brome mosaic virus". Journal of Molecular Biology. 317 (1): 95–108. doi:10.1006/jmbi.2001.5389. PMID 11916381.
  2. "ICTV Report Bromoviridae".
  3. Bujarski, J; Gallitelli, D; García-Arenal, F; Pallás, V; Palukaitis, P; Reddy, MK; Wang, A; ICTV Report, Consortium (August 2019). "ICTV Virus Taxonomy Profile: Bromoviridae". The Journal of General Virology. 100 (8): 1206–1207. doi:10.1099/jgv.0.001282. PMID 31192783.
  4. "Viral Zone". ExPASy. Retrieved 15 June 2015.
  5. Lai MM. RNA recombination in animal and plant viruses. Microbiol Rev. 1992 Mar;56(1):61-79. PMID 1579113; PMCID: PMC372854
  6. Kim MJ, Kao C. Factors regulating template switch in vitro by viral RNA-dependent RNA polymerases: implications for RNA-RNA recombination. Proc Natl Acad Sci U S A. 2001 Apr 24;98(9):4972-7. doi: 10.1073/pnas.081077198. Epub 2001 Apr 17. PMID 11309487; PMCID: PMC33148
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