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84:. This group comprises all those viruses which do not fit into either of the above two groups. When the viral particle has entered a host cell, the host cellular enzymes digest the capsid and its constituent capsomeres, thereby exposing the naked genetic material (DNA/RNA) of the virus, which subsequently enters the
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2) Helical- The protomers are not grouped in capsomeres, but are bound to each other so as to form a ribbon-like structure. This structure folds into a helix because the protomers are thicker at one end than at the other. The diameter of the helical capsid is determined by characteristics of its
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The capsomeres protect against physical, chemical, and enzymatic damage and are multiply redundant; having a few protein subunits that are repeated. This is because the viral genome is being as economic as possible by only needing a few protein codons to make a large structure. One of the major
69:) at the faces. There are always twelve pentons, but the number of hexons varies among virus groups. In electron micrographs, capsomeres are recognized as regularly spaced rings with a central hole.
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with 12 vertices and 20 faces. Two types of capsomeres constitute the icosahedral capsid: pentagonal (pentons) at the vertices and hexagonal (
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functions of a capsid is to introduce the enclosed viral genome into host cells by adsorbing readily to host cell surfaces.
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aggregate to form capsomeres. Various arrangements of capsomeres are: 1) Icosahedral, 2) Helical, and 3) Complex.
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protomers, while its length is determined by the length of the nucleic acid it encloses.
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138:"Visualization of Icosahedral Capsid of Herpes Simplex Virus-1"
144:. Springer Science & Business Media. p. 93.
115:. Jones & Bartlett Publishers. p. 113.
35:. Capsomeres self-assemble to form the capsid.
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205:. Tata McGraw-Hill Education. p. 390.
46:, the capsid molecules are clearly visible.
31:that protects the genetic material of a
202:Microbiology:Application Based Approach
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76:3) Complex- e.g., that exhibited by
142:DNA Viruses: Methods and Protocols
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178:. Garland Science. p. 91.
172:Bruce Hofkin (12 April 2010).
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112:Alcamo's Microbes and Society
175:Living in a Microbial World
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136:Paul M. Lieberman (2005).
109:Benjamin S. Weeks (2012).
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42:In this diagram of an
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23:is a subunit of the
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212:978-0-07-015147-5
185:978-1-136-84400-3
151:978-1-59259-848-9
122:978-0-7637-9064-6
86:replication cycle
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82:rhabdovirus
59:icosahedron
96:References
63:polyhedron
44:Adenovirus
52:protomers
21:capsomere
240:Virology
234:Category
78:poxvirus
29:protein
218:6 June
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157:6 June
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67:hexons
25:capsid
61:is a
33:virus
220:2017
207:ISBN
180:ISBN
159:2017
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19:The
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