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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Palak Varma posted an Question
February 05, 2021 • 18:46 pm
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30 points
30 points
- IIT JAM
- Biotechnology (BT)
Please explain it in a simple language to understand it properly
Icosahedral Capsids: In these structures, the subunits are arranged in the form of a hollow, quasi spherical structure, with the genome within. An icosahedron is defined as being made up of 20 equilateral triangular faces arranged around the surface of a sphere. They display 2-3-5 fold symmetry as follows: An axis of 2 fold rotational symmetry through the center of each edge. An axis of 3 fold rotational symmetry through the center of each face. An axis of 5 fold rotational symmetry through the center of each corner.
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Anup Padwal![best-answer]()
Basic behind this is to study shape of viruses: Bacteria can be found in a variety of shapes and sizes. Common bacterial cell shapes include cocci (spherical), bacilli (rod-shaped), spiral, and vibrio. Viruses typically have spherical (polyhedral), rod-shaped, or helical shaped capsids. Most viruses have icosahedral and helical capsid structure, although a few have complex virion architecture. An icosahedron is a geometric shape with 20 sides, each composed of an equilateral triangle, and icosahedral viruses increase the number of structural units in each face to expand capsid size. A helical virus is a virus that has a capsid shaped in a filamentous or rod-shaped structure that has a central cavity that encloses its nucleic acid. While an icosahedral virus is a virus consisting of identical subunits that make up equilateral triangles that are in turn arranged in a symmetrical fashion. To understand it you also have to search for the 3D structure of different shape of viruses.