Notes on Genus: Allexivirus
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flexuous filaments
Type member: Shallot virus X
Contents
- Members of this Genus
- General Description
- Morphology
- Electron Micrograph
- Genome
- Genus Genomic Organization
- Genome Map
- Type Member Genomic Organization
- All Known Sequences
- Curated Sequences
General Description
The genus Allexivirus is one of the genera in the family Alphaflexiviridae. In genome organisation it particularly resembles the genera Mandarivirus and Potexvirus but the third and smallest gene of the triple gene block is missing (or lacks a start codon) and ORF4 is a larger (c. 40 kDa) serine-rich protein. All the allexiviruses described so far infect members of the onion (Allium) genus, from which the name is derived.Morphology
Virions filamentous, not enveloped, 700-800 nm long and 13 nm in diameter.Genome
Monopartite, linear, single stranded, positive sense RNA of length c. 8000-9000 nucleotides. The 3' terminus has a poly(A) tract.Genus Genomic Organization
Genes are translated from a total of 6 open reading frames:| 1 | 170-195 kDa | Polymerase, showing homology to ORF1 of members of the genus Potexvirus |
| 2 | 25-28 kDa | ORFs 2-3 (Triple gene block proteins 1 and 2): translated from different reading frames and probably involved in cell-to-cell movement. |
| 3 | 11-12 kDa | |
| 4 | 32-43 kDa | Serine-rich protein with no substantial homologies to proteins of other plant viruses |
| 5 | 26-29 kDa | Coat protein |
| 6 | 14-15 kDa | Nucleic acid binding protein |
Type Member Genomic Organization
Genes are translated from a total of 6 open reading frames:| 1 | 195 kDa | Polymerase, showing homology to ORF1 of members of the genus Potexvirus |
| 2 | 26 kDa | ORFs 2-3 (Triple gene block proteins 1 and 2): translated from different reading frames and probably involved in cell-to-cell movement. |
| 3 | 11 kDa | |
| 4 | 42 kDa | Serine-rich protein with no substantial homologies to proteins of other plant viruses |
| 5 | 28 kDa | Coat protein |
| 6 | 15 kDa | Nucleic acid binding protein |