Notes on Genus: Potexvirus
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flexuous filaments
Type member: Potato 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
This genus, sometimes known as the Potato Virus X group, is characterised by its stable, filamentous particles and by mechanical transmission. It is one of the genera in the family Alphaflexiviridae. In genome organisation it particularly resembles the genera Allexivirus and Mandarivirus as well as some genera in the family Betaflexiviridae but virions are shorter than those of other genera.Morphology
Virions filamentous, not enveloped, 470-580 nm long and 13 nm in diameter. Symmetry helical, with pitch of 3.4 nm.Virions composed of 6 % nucleic acid and 94 % protein.
Genome
Monopartite, linear, single stranded, positive-sense RNA, 5800-7200 nucleotides long. The 3' terminus has a poly(A) tract and the 5' terminus has a methylated nucleotide cap. Cap sequence m7GpppA.Genus Genomic Organization
Genes are translated by means of subgenomic RNAs, with a total of 5 open reading frames:| 1 | 150-191 kDa | Polymerase |
| 2 | 24-26 kDa | ORFs 2-4 (Triple gene block): translated from different reading frames and all involved in cell-to-cell movement |
| 3 | 11-13 kDa | |
| 4 | 7-11 kDa | |
| 5 | 22-27 kDa | Coat protein |
Type Member Genomic Organization
Genes are translated by means of subgenomic RNAs, with a total of 5 open reading frames:| 1 | 166 kDa | Polymerase |
| 2 | 25 kDa | ORFs 2-4 (Triple gene block): translated from different reading frames and all involved in cell-to-cell movement |
| 3 | 12 kDa | |
| 4 | 8 kDa | |
| 5 | 25 kDa | Coat protein |