Tobacco virtovirus 1

Tobacco virtovirus 1, informally called Tobacco mosaic satellite virus, Satellite tobacco mosaic virus (STMV), or tobacco mosaic satellite virus, is a satellite virus first reported in Nicotiana glauca from southern California, U.S.. Its genome consists of linear positive-sense single-stranded RNA.[3]

The trivial genome map of satellite virus genera Virtovirus and Aumaivirus[4]

Tobacco virtovirus 1
Crystals of Tobacco virtovirus 1 grown in space. They are ca. ~1.5 mm long and ~30 times larger by volume than Earth-grown samples.[1]
Virus classification
(unranked):	Virus
Realm:	Riboviria
Phylum:	incertae sedis
Genus:	Virtovirus
Species:	Tobacco virtovirus 1
Synonyms[2]
Tobacco mosaic satellite virus Satellite tobacco mosaic virus

Schematic diagram of a Virtovirus particle, cross section and side view.

Tobacco virtovirus 1 is a small, icosahedral plant virus which worsens the symptoms of infection by Tobacco mosaic virus (TMV). Satellite viruses are some of the smallest possible reproducing units in nature; they achieve this by relying on both the host cell and a host virus (in this case, TMV) for the machinery necessary for them to reproduce. The entire Tobacco virtovirus 1 particle consists of 60 identical copies of a single protein (CP) that make up the viral capsid (coating), and a 1063-nucleotide single-stranded RNA genome which codes for the capsid and one other protein of unknown function.[5]