Search results
Results From The WOW.Com Content Network
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 ...
1) Icosahedral- An icosahedron is a polyhedron with 12 vertices and 20 faces. Two types of capsomeres constitute the icosahedral capsid: pentagonal (pentons) at the vertices and hexagonal at the faces. There are always twelve pentons, but the number of hexons varies among virus groups.
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.
Capsomeres can arrange into an icosahedral, helical, or complex capsid, but in many viruses, such as the herpes simplex virus, an icosahedral capsid is assembled. [2] Three asymmetric and nonidentical viral protein units make up each of the twenty identical triangular faces in the icosahedral capsid.
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]
Its capsid appears hexagonal under an electron microscope, therefore the capsid symmetry is icosahedral. [12] It does not appear to possess an outer viral envelope, suggesting that the virus does not exit the host cell by exocytosis. [13] Mimivirus shares several morphological characteristics with all members of the NCLDV group of viruses.