Bromoviridae
From MicrobeWiki, the student-edited microbiology resource
A Viral Biorealm page on the family Bromoviridae
Contents |
Baltimore Classification
Higher order taxa
Viruses; ssRNA positive-strand viruses, no DNA stage; Bromoviridae
Genera
Alfamovirus, Ilarvirus, Bromovirus, Cucumovirus, Oleavirus
Description and Significance
The Bromoviridae family is one of the most important families of plant viruses, as they are the most widespread. Several members of this family are responsible for major crop diseases worldwide. Cucumber mosaic cucumovirus is one of these members, as it is the most widespread of all plant viruses around the world and infects the largest number of plant species (over 1000). (sources: Codoñer et al., Verma et al.)
Genome Structure
The bromovirus genome consists of three linear, positive-sense, single-strand RNAs. The complete genome is 7900-8910 nucleotides long. The RNA-1 has been fully sequenced; it is 3200-3644 nucleotides in length. The RNA-2 and RNA-3 have been sequenced, but there is only an estimate of their lengths. RNA-2 is approximately 2600-3050 nucleotides long while RNA-3 is approximately 2100-2216 nucleotides long. Nucleotide sequences at the 3'-terminus are similar, and the 5'-terminus of the genome has a methylated nucleotide cap. (sources: Codoñer et al., ICTVdB)
Virion Structure of a Bromovirus
Bromovirus virions consist of a non-enveloped capsid. The capsid exhibits icosahedral symmetry and can be round to elongated. Length of bromovirus virions is 26-35nm. (source: ICTVdB)
Reproduction Cycle of a Bromovirus in a Host Cell
Viral Ecology & Pathology
References
Codoñer et al. "Molecular Evolution of the Plant Virus Family Bromoviridae Based on RNA3-Encoded Proteins." Journal of Molecular Evolution 61.5 (2005): 697-705.
ICTVdB - The Universal Virus Database, version 4. http://www.ncbi.nlm.nih.gov/ICTVdb/ICTVdB/
