ICTV Virus Taxonomy Profile: Alphaflexiviridae.

Jan F Kreuze,Ictv Report Consortium,Wulf Menzel,Ki Hyun Ryu,Thierry Candresse,Anna Maria Vaira,Sergey K Zavriev,John Hammond

doi:10.1099/jgv.0.001436

Abstract

The family Alphaflexiviridae includes viruses with flexuous filamentous virions that are 470–800 nm in length and 12–13 nm in diameter. Alphaflexiviruses have a single-stranded, positive-sense RNA genome of 5.5–9 kb. They infect plants and plant-infecting fungi. They share a distinct lineage of alphavirus-like replication proteins that is unusual in lacking any recognized protease domain. With a single exception, cell-to-cell and long-distance movement is facilitated by triple gene block proteins in plant-infecting genera. This is a summary of the International Committee on Taxonomy of Viruses (ICTV) Report on the family Alphaflexiviridae, which is available at www.ictv.global/report/alphaflexiviridae.

Highlights

The family Alphaflexiviridae includes viruses with flexuous filamentous virions that are 470–800 nm in length and 12–13 nm in diameter
The viral capsid is composed of a single polypeptide ranging in size from 18 to 43 kDa except for members of the genus Lolavirus, which have two carboxy- coterminal capsid protein variants, and members of the genus Sclerodarnavirus in which no capsid protein has been identified [1, 2] (Fig. 1, Table 1)
Virions contain a single molecule of linear, positive-sense RNA of 5.5–9.0 kb, which is 5–6 % by weight of the virion

Summary

Introduction

The family Alphaflexiviridae includes viruses with flexuous filamentous virions that are 470–800 nm in length and 12–13 nm in diameter. Typical member: Virion Genome Replication Translation Host range Taxonomy shallot virus X, Kanyuka (M97264), species Shallot virus X, genus Allexivirus Flexuous filaments, usually 12–13 nm (range 10–15 nm) in diameter and from 470 to 800 nm in length Single molecule of linear, single-stranded, positive-sense RNA of 5.5–9.0 kb Cytoplasmic, virus-encoded RNA-directed RNA polymerase From capped and polyadenylated genome length and 3′-terminal subgenomic mRNAs Plants and fungi Realm Riboviria, kingdom Orthornavirae, phylum Kitrinoviricota, class Alsuviricetes, order Tymovirales; several genera with over 50 species Usually 12–13 nm in diameter (range 10–15 nm) and from 470 to about 800 nm in length, depending on the genus.

Results

Conclusion