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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 bacterial capsule is a large structure common to many bacteria. [1] It is a polysaccharide layer that lies outside the cell envelope, and is thus deemed part of the outer envelope of a bacterial cell. It is a well-organized layer, not easily washed off, and it can be the cause of various diseases.
MS2 infects enteric bacteria carrying the fertility (F) factor, a plasmid that allows cells to serve as DNA donors in bacterial conjugation. Genes on the F plasmid specifies the proteins of the F pilus, which includes the F-pilin protein that serves as the viral receptor. MS2 attaches to the F-pilin on the side of the pilus using its single ...
Both in-vivo assembly (i.e., assembly inside E. coli bacteria via recombinant co-expression of multiple proteins) and in-vitro assembly (i.e., protein self-assembly in a reaction vessel using stoichiometric quantities of previously purified proteins) have been successfully shown to form virus-like particles.
The structures of the phage capsid and of some other phage proteins are available from the Protein Data Bank. [6] The single-stranded Ff phage DNA runs down the central core of the phage, and is protected by a cylindrical protein coat built from thousands of identical α-helical major coat protein subunits coded by phage gene 8.
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 integration of phage λ takes place at a special attachment site in the bacterial and phage genomes, called att λ. The sequence of the bacterial att site is called attB, between the gal and bio operons, and consists of the parts B-O-B', whereas the complementary sequence in the circular phage genome is called attP and consists of the parts ...
Inside the lipid envelope is a capsid of 40 nm in diameter. The capsid protein (CP) has different functions. [8] Its main tasks are the formation of homooligomeres to form the capsid, and the binding of the genomic RNA. Further is it responsible for the aggregation of RNA in the capsid, it interacts with the membrane proteins E1 and E2 and ...