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Tobacco virtovirus 1, informally called Tobacco mosaic satellite virus, Satellite tobacco mosaic virus , 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.
Tobacco virtovirus 1 is a small, icosahedral plant virus which worsens the symptoms of infection by Tobacco mosaic virus. 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 for the machinery necessary for them to reproduce. The entire Tobacco virtovirus 1 particle consists of 60 identical copies of a single protein that make up the viral capsid , and a 1063-nucleotide single-stranded RNA genome which codes for the capsid and one other protein of unknown function.