Question

Explain structure of TMV with labeled diagram

Answer 1

The first virus to be detected was TMV. While it was understood from the late 19th century that a non-bacterial communicable disease affected tobacco crops, but it was not until 1930 it was determined that the infectious agent was a virus. This is the first pathogen known as a virus.

Complete answer
First we should know about TMV to answer this question. Tobacco mosaic virus (TMV) is often a proactive-sense single-stranded RNA virus species in the Tobamovirus genus that attacks a large variety of plants, mainly tobacco and other members of the Solanaceae family. The infection induces specific features, such as "mosaic" mottling on the leaves and discoloration
-The mosaic virus in tobacco has a rod-like look.
-Its capsid is composed of 2130 coat protein molecules and one single-strand genomic RNA molecule, 6400 bases long.
-The protein coat self-assembles around the RNA into the rod-like helical conformation i.e. 16.3 proteins per helix turn, which constructs a hairpin loop structure.
- The protein monomer is made up of 158 amino acids that are arranged into four major alpha-helices, connected by a notable loop proximal to the virion axis.
- Virions are about 300 nm in length and about 18 nm in diameter.

Note: TMV is a heat-resistant virus. It can endure up to 50 ° C within 30 minutes on a dry leaf. TMV has a refractive index of around 1.57.