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Icosahedral capsid of an adenovirus Virus capsid T-numbers. The icosahedral structure is extremely common among viruses. The icosahedron consists of 20 triangular faces delimited by 12 fivefold vertexes and consists of 60 asymmetric units. Thus, an icosahedral virus is made of 60N protein subunits.
The icosahedral capsid structure is the most common arrangement due to 2-3-5 symmetry of its namesake shape, allowing for the use of up to the greatest number (60 units) of triangular “identical symmetrical units” to construct a 'spherical' shell to enclose some given material at any given size. [12]
All members of the order have a virion structure that consists of a DNA core surrounded by an icosahedral capsid composed of 12 pentavalent and 150 hexavalent capsomeres (T = 16). The capsid has a diameter of ~110 nanometers (nm) and is embedded in a proteinaceous matrix called the tegument , which in its turn is enclosed by a glycoprotein ...
Bacteriophage MS2 (Emesvirus zinderi), commonly called MS2, is an icosahedral, positive-sense single-stranded RNA virus that infects the bacterium Escherichia coli and other members of the Enterobacteriaceae. [1] MS2 is a member of a family of closely related bacterial viruses that includes bacteriophage f2, bacteriophage Qβ, R17, and GA. [2]
The capsid is an arrangement of 60 protomers in a tightly packed icosahedral structure. Each protomer consists of four polypeptides known as VP (viral protein) 1, 2, 3 and 4. VP2 and VP4 polypeptides originate from one protomer known as VP0 that is cleaved to give the different capsid components.
Schematic diagram of a Parvoviridae virion A diagram of the canine parvovirus's capsid, containing 60 monomers of the capsid protein. Parvovirus virions are 23–28 nanometers (nm) in diameter and consist of the genome enclosed inside a capsid that is icosahedral in shape with a rugged surface. The capsid is composed of 60 structurally ...
Rubella virus, scientific name Rubivirus rubellae, is a member of the genus Rubivirus and belongs to the family of Matonaviridae, whose members commonly have a genome of single-stranded RNA of positive polarity which is enclosed by an icosahedral capsid.
Phycodnaviridae is a family of large (100–560 kb) double-stranded DNA viruses that infect marine or freshwater eukaryotic algae.Viruses within this family have a similar morphology, with an icosahedral capsid (polyhedron with 20 faces).