100 4 Taxonomy, Physiology, and Ecology of Aquatic Microorganisms
5 lEVIVIRIDAE
Structure
Non-enveloped, spherical virion about 26nm in diameter with
icosahedral symmetry (T=3) composed of 180 CP proteins and
a single A protein. Linear, ssRNA(+) genome about 4 kb in size.
The 5’ end is capped. Encodes for 4 proteins.
Host
It attacks Enterobacteriacea, Acinetobacter, Caulobacter and
Pseudomonas.6 lIPOTHRIXVIRIDAE
Structure
Enveloped, rod-shaped. The capsid is about 24-38 nm in diam
eter and 410-1950 nm in length.
Linear dsDNA genome of 15.9 to 56 kb. Extremities of the
DNAare modified in an unknown manner.
The Lipothrixviridae family consists of a family of viruses
that infect archaea. They share characteristics from the
Rudiviridae family and both have are filamentous viruses with
linear dsDNA genomes that infect thermophilic archaea in the
kingdom Crenarchaeota. Lipothrixviridae are enveloped.
Host
Lipothrixviridae is a family crenarchaeal viruses. It is by far the
most diverse family of crenarchaeal viruses, with six isolates
divided into three genera: Alphalipothrixvirus, Betalipothrix
virus, and Gammalipothrixvirus. Alphalipothrixvirus contains
TTV1, TTV2, and TTV3, isolated from acidic hot springs
Iceland. Betalipothrixvirus contains SIFV, also isolated in
Iceland. Finally, Gammalipothrixvirus is represented by AFV1,
isolated from Yellowstone National Park.
Also Acidianus, Sulfolobus, Thermoproteus.