Notes on Genus: Pospiviroid

no particles

Type member: Potato spindle tuber viroid

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 is one of five genera of viroids assigned to the family Pospiviroidae. Like all the other genera in this family, members have a central conserved region (CCR) and lack the ability to self-cleave through hammerhead structures. Classification is based on the sequence of the CCR. An arbitrary level of 90% sequence similarity currently separates variants from species.

Morphology

Like all viroids, they have no virions and encode no proteins.

Genome

Their genome consists of one circular, single stranded molecule of RNA.

Genus Genomic Organization

There appear to be five structural domains, giving rise to rod-like molecules:

Type Member Genomic Organization

The genome consists of one circular, single stranded molecule of RNA, 356-360 nucleotides long, which is non-coding.