Tobamovirus: Difference between revisions
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==Genome Structure== | ==Genome Structure== | ||
The genome | The Tobamovirus genome is either monomeric or polymeric, non-segmented, and contains a single molecule of linear, positive-sense, single-stranded RNA. Minor species of non-genomic nucleic acid may also be found in virions. The encapsidated nucleic acid is mainly of genomic origin but virions may also contain nucleic acid of host origin and subgenomic mRNA including host rRNA found in the short particles of some species. The complete genome sequence is about 6450 nucleotides long. The 5'-end of the genome has a methylated nucleotide cap. The 3'-terminus has a tRNA-like structure that accepts histidine. (source: [http://www.ncbi.nlm.nih.gov/ICTVdb/ICTVdB/00.071.0.01.htm ICTVdB]) | ||
==Virion Structure of a Tobamovirus== | ==Virion Structure of a Tobamovirus== | ||
Tobamovirus virions consist of a non-enveloped capsid. The capsid is elongated, rod shaped, straight, and exhibits helical symmetry. Virons are 70-100 nm in length and 15-17.26-18.2 nm in width. The capsid has a herring-bone pattern with a low percentage in population clear predominate lengths. The axial canal could be distinct with a diameter of 2-3.257-4 nm. The basic helix can either be be obvious or obscure, and has a pitch of 2.3-2.314-2.4 nm. (source: [http://www.ncbi.nlm.nih.gov/ICTVdb/ICTVdB/00.071.0.01.htm ICTVdB]) | |||
==Reproduction Cycle of a Tobamovirus in a Host Cell== | ==Reproduction Cycle of a Tobamovirus in a Host Cell== | ||
Revision as of 20:51, 13 July 2006
Baltimore Classification
Higher order taxa
Viruses; ssRNA positive-strand viruses, no DNA stage; (no assigned family); Tobamovirus
Species
Tobacco mosaic virus, Cucumber green mottle mosaic virus, Frangipani mosaic virus, Turnip vein-clearing virus (examples)
Description and Significance
Genome Structure
The Tobamovirus genome is either monomeric or polymeric, non-segmented, and contains a single molecule of linear, positive-sense, single-stranded RNA. Minor species of non-genomic nucleic acid may also be found in virions. The encapsidated nucleic acid is mainly of genomic origin but virions may also contain nucleic acid of host origin and subgenomic mRNA including host rRNA found in the short particles of some species. The complete genome sequence is about 6450 nucleotides long. The 5'-end of the genome has a methylated nucleotide cap. The 3'-terminus has a tRNA-like structure that accepts histidine. (source: ICTVdB)
Virion Structure of a Tobamovirus
Tobamovirus virions consist of a non-enveloped capsid. The capsid is elongated, rod shaped, straight, and exhibits helical symmetry. Virons are 70-100 nm in length and 15-17.26-18.2 nm in width. The capsid has a herring-bone pattern with a low percentage in population clear predominate lengths. The axial canal could be distinct with a diameter of 2-3.257-4 nm. The basic helix can either be be obvious or obscure, and has a pitch of 2.3-2.314-2.4 nm. (source: ICTVdB)
Reproduction Cycle of a Tobamovirus in a Host Cell
Viral Ecology & Pathology
References
ICTVdB - The Universal Virus Database, version 4. http://www.ncbi.nlm.nih.gov/ICTVdb/ICTVdB/
