|Group:||Group II (ssDNA)|
The virus genus Densovirus belongs to the Densovirinae subfamily which belongs to the Parvoviridae family. The viruses of this genus are single-stranded DNA viruses (and are thus group II viruses under the Baltimore classification). The viruses of this genus are invertebrate viruses, infecting crustaceans and insects.
These virions consist of non-enveloped capsids that have a round appearance and display icosahedral symmetry. The virions each have an isometric (and therefore spherical) nucleocapsid with a diameter of either 18-22 nm or 20-26 nm. Sixty capsomers are present in each capsid. The structure of each capsomer is described as "a quadrilateral 'kite-shaped' wedge"; the surface is said to have a rough appearance with small projections. The centre of capsids are sometimes visualised as appearing dark due to stain penetration in preparations where only a single species is retrieved. The virions do not appear to contain lipids. The buoyant density (in CsCl) of the virions is 1.4-1.44 g cm−3.
These viruses have non-segmented genomes that contains a single linear molecule of single-stranded DNA. The genome codes for structural proteins and is 5000 nucleotides in length and could either be negative-sense or positive-sense. Conserved nucleotide sequences of usually 120-300 or more nucleotides are present at the 3'-terminus and an inverted repeat of this could also be found at the 5'-terminus.
- "Densovirinae". ICTVdB - The Universal Virus Database, version 4. Retrieved 2007-05-15.