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A capsid is the protein shell of a virus, enclosing its genetic material. It consists of several oligomeric (repeating) ... The functions of the capsid are to:
The p24 capsid protein is the most abundant HIV protein with each virus containing approximately 1,500 to 3,000 p24 molecules. [1] It is the major structural protein within the capsid , and it is involved in maintaining the structural integrity of the virus and facilitating various stages of the viral life cycle, including viral entry into host ...
The capsomere is a subunit of the capsid, an outer covering of protein that protects the genetic material of a virus. Capsomeres self-assemble to form the capsid. [1] In this diagram of an Adenovirus, the capsid molecules are clearly visible. Subunits called protomers aggregate to form capsomeres. Various arrangements of capsomeres are: 1 ...
The p24 capsid protein (CA) is a 24 kDa protein fused to the C-terminus of MA in the unprocessed HIV Gag polyprotein. After viral maturation, CA forms the viral capsid. CA has two generally recognized domains, the C-terminal domain (CTD) and the N-terminal domain (NTD). The CA CTD and NTD have distinct roles during HIV budding and capsid structure.
The AAV capsid is composed of a mixture of VP1, VP2, and VP3 totaling 60 monomers arranged in icosahedral symmetry in a ratio of 1:1:10, [51] with an empty mass of approximately 3.8 MDa. [52] The crystal structure of the VP3 protein was determined by Xie, Bue, et al. [53] AAV2 capsid, shown as a ribbon diagram, with the back half hidden for ...
The phage particle consists of a head (also known as a capsid), [4] a tail, and tail fibers (see image of virus below). The head contains the phage's double-strand linear DNA genome. During infections, the phage particle recognizes and binds to its host, E. coli , causing DNA in the head of the phage to be ejected through the tail into the ...
The capsid proteins are often differentiated into major and minor capsid proteins (MCP and mCP). In exceptional cases, there are also viruses without a capsid (i.e., true virions), such as the RNA viruses of the Narnaviridae and the viroids of the Pospiviroidae (with the Citrus Exocortis Viroid and the Citrus Bark Crack Viroid).
The capsid, having a focused role of protecting the genome in addition to immune recognition evasion. [13] The viral capsid is known for its protection of RNA before it is inserted into the host cell, unlike the viral envelope which protects the protein capsid. [14]