What is the shape of the tobacco mosaic virus capsid?
What is the shape of the tobacco mosaic virus capsid?
The rod-shaped virus particles (virions) of TMV measure about 300 nm x 15 nm (Figure 6). A single TMV particle is composed of 2,130 copies of the coat protein (CP) that envelope the RNA molecule of about 6,400 nucleotides (Figure 7).
Is tobacco a mosaic virus?
Tobacco mosaic virus (TMV) is a positive-sense single-stranded RNA virus species in the genus Tobamovirus that infects a wide range of plants, especially tobacco and other members of the family Solanaceae….
| Tobacco mosaic virus | |
|---|---|
| Order: | Martellivirales |
| Family: | Virgaviridae |
| Genus: | Tobamovirus |
| Species: | Tobacco mosaic virus |
What causes the tobacco mosaic virus?
The tobacco mosaic virus infects tobacco and lots of other closely related species like tomatoes and peppers. It is transmitted by contact between plants, either naturally or on the hands of farmers. It infects the chloroplasts of plant leaves and changes their colour from green to yellow or white in a mosaic pattern.
What is the structure of adenovirus?
The adenovirus particle consists of an icosahedral protein shell surrounding a protein core that contains the linear, double-stranded DNA genome (Fig. 67-2). The shell, which is 70 to 100 nm in diameter, is made up of 252 structural capsomeres.
What is the shape of TMV capsid Mcq?
17. The shape of the TMV is _______. Sol:(a) Rod-shaped.
How do you identify a tobacco mosaic virus?
Symptoms associated with TMV infections:
- stunting.
- mosaic pattern of light and dark green (or yellow and green) on the leaves.
- malformation of leaves or growing points.
- yellow streaking of leaves (especially monocots)
- yellow spotting on leaves.
- distinct yellowing only of veins.
What is the size of tobacco mosaic virus?
Particles of Tobacco mosaic virus (TMV) consist of a 6.4 kb molecule of single-stranded RNA encapsidated by approximately 2130 copies of the 17.5 kDa coat protein arranged with helical symmetry. TMV particles are hollow cylinders 300 nm in length with external and internal diameters of 18 and 4 nm, respectively.
What are the two major components of the tobacco mosaic virus?
Tobacco mosaic virus (TMV) encodes four known functional proteins: the 126 and 183 kDa replication-associated proteins, the movement protein (MP), and the structural capsid or coat protein (CP).
How is tobacco mosaic controlled?
Controlling the spread of tobacco mosaic virus wash their hands after handling infected plants. wash tools that have come into contact with infected plants in detergent or bleach. rotate the crops they grow in a contaminated field – they must not grow tobacco or tomato plants in the field for at least two years.
What is the structure of influenza virus?
The structure of the influenza virus (see Figure 1) is somewhat variable, but the virion particles are usually spherical or ovoid in shape and 80 to 120 nanometers in diameter. Sometimes filamentous forms of the virus occur as well, and are more common among some influenza strains than others.
Which virus has the largest genome?
We recently described Megavirus chilensis, a giant virus isolated off the coast of Chile, also replicating in fresh water acanthamoeba. Its 1,259,197-bp genome encodes 1,120 proteins and is the largest known viral genome.
How is the structure of tobacco mosaic virus determined?
The structure of an intact tobacco mosaic virus (TMV) particle was determined at 2.9 A resolution using fibre diffraction methods. All residues of the coat protein and the three nucleotides of RNA that are bound to each protein subunit were visible in the electron density map.
Can aphids spread tobacco mosaic virus?
Tobacco Mosaic Virus (TMV) If the sap contains TMV, it can be introduced into other plants when those come in contact with this sap. Sucking insects such as aphids do not spread TMV. Chewing insects such as grasshoppers and caterpillars occasionally spread the virus but are usually not important in spread.
How can tobacco products become contaminated with TMV?
When tobacco products are handled or kept in pockets, hands and clothing can become contaminated with TMV and be a source of virus. TMV is not spread in the smoke of burning tobacco.
