Notes on Genus: Potexvirus

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 kDaCoat 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 kDaCoat protein