Notes on Genus: Nanoviridae alphasatellites

no particles of their own

Type member:

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

Alphasatellites were first discovered in association with begomoviruses (where they were initially described as DNA-1 molecules and are classified here as Begomovirus alphasatellites). They encode a rolling-circle replication initiator protein (Rep) and are capable of self-replication in an appropriate host but depend upon the helper virus for encapsidation and movement between plants. The related molecules described here are additional satellite components associated with viruses in the family Nanoviridae.

Morphology

There are no distinctive virions, because the satellite DNA is encapsidated by the helper virus.

Genome

Monopartite, circular, ssDNA of 1000-1130nt.

Genus Genomic Organization

The DNA encodes a single replication initiator protein of 32-37 kDa in the virion (positive) sense. They are not officially classified by ICTV, but are here organised into "species-like" clusters within which the sequences are closely related (usually >80% nt identity) to one another.

Type Member Genomic Organization

There is no formal type member