Search results
Results from the WOW.Com Content Network
Orthopoxvirus particles. A DNA virus is a virus that has a genome made of deoxyribonucleic acid (DNA) that is replicated by a DNA polymerase.They can be divided between those that have two strands of DNA in their genome, called double-stranded DNA (dsDNA) viruses, and those that have one strand of DNA in their genome, called single-stranded DNA (ssDNA) viruses. dsDNA viruses primarily belong ...
cccDNA (covalently closed circular DNA) is a special DNA structure that arises during the propagation of some viruses in the cell nucleus and may remain permanently there. It is a double-stranded DNA that originates in a linear form that is ligated by means of DNA ligase to a covalently closed ring.
The structure of adenovirus. 1 = penton capsomers, 2 = hexon capsomers, and 3= viral genome (linear dsDNA) Adenoviruses are medium-sized (90–100 nm). [ 2 ] The virions are composed of one linear piece of double-stranded DNA inside an icosahedral capsid . 240 hexon proteins make up the bulk of the capsid, while twelve penton bases cap the ...
In other viruses, especially more complex viruses with double-stranded DNA genomes, the capsid proteins assemble into empty precursor procapsids that include a specialized portal structure at one vertex. Through this portal, viral DNA is translocated into the capsid. [8]
When a virus infects a cell, the virus forces it to make thousands more viruses. It does this by making the cell copy the virus's DNA or RNA, making viral proteins, which all assemble to form new virus particles. [37] There are six basic, overlapping stages in the life cycle of viruses in living cells: [38]
Hepatitis B virus is a member of the Hepadnavirus family. [11] The virus particle, called Dane particle [12] , consists of an outer lipid envelope and an icosahedral nucleocapsid core composed of protein. The nucleocapsid encloses the viral DNA and a DNA polymerase that has reverse transcriptase activity similar to retroviruses. [13]
The phi X 174 (or ΦX174) bacteriophage is a single-stranded DNA virus that infects Escherichia coli. This virus was isolated in 1935 by Nicolas Bulgakov [1] in Félix d'Hérelle's laboratory at the Pasteur Institute, from samples collected in Paris sewers. Its characterization and the study of its replication mechanism were carried out from ...
A large-scale analysis of viral capsid components suggested that the single horizontal jelly roll is the most common fold among capsid proteins, accounting for about 28% of known examples. [12] Another group of viruses uses single jelly roll proteins in their capsids, but in the vertical rather than horizontal orientation.