Tobacco mosaic virus
First discovered virus, first crystallized, model for virology.
Tobacco mosaic virus (TMV) is a positive-sense single-stranded RNA virus in the genus Tobamovirus that infects a wide range of plants, especially tobacco and other members of the family Solanaceae. It was the first virus to be discovered and the first to be crystallized, marking a turning point in virology.
- type
- Positive-sense single-stranded RNA virus
- genus
- Tobamovirus
Reader's Guide
Tobacco mosaic virus holds a foundational place in virology as the first virus ever discovered and the first to be crystallized. Its investigation established key concepts: the existence of filterable, non-bacterial infectious agents; the ability of viruses to form crystals while retaining infectivity; and the self-assembly of viral components into functional particles. The work of Ivanovsky, Beijerinck, and Stanley laid the groundwork for understanding viruses as distinct biological entities. TMV's rod-like structure, helical capsid, and single-stranded RNA genome have made it a model system for studying virus architecture, replication, and host interactions. Its wide host range and economic impact on crops like tobacco and tomato underscore its agricultural relevance. The virus's thermostability and transmission via direct contact, including through human handling, highlight practical challenges in disease management. TMV remains a key tool in molecular biology and virology research.
Did You Know?
- Rosalind Franklin speculated that TMV was hollow and its RNA single-stranded, later proven correct.
- TMV can survive in contaminated tobacco products for many years and can be transmitted by smokers through touch.
Frequently Asked Questions
How does Tobacco mosaic virus's story end?
There is no true ending—TMV remains a persistent agricultural pathogen found in fields worldwide today. Its narrative as a scientific milestone, however, is set in stone: it stands as the first virus ever identified and the first to be crystallized, making it the foundational figure of the entire field of virology.
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