''Rhizidiovirus'' is a genus of

viruses A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism. Viruses infect all life forms, from animals and plants to microorganisms, including bacteria and archaea. Since Dmitri Ivanovsky's ...

Stramenopile Stramenopile is a clade of organisms distinguished by the presence of stiff tripartite external hairs. In most species, the hairs are attached to flagella, in some they are attached to other areas of the cellular surface, and in some they have be ...

sDawe VH, Kuhn CW (1983) Isolation and characterization of a double-stranded DNA mycovirus infecting the aquatic fungus, ''Rhizidiomyces''. Virology 130(1):21–28 (

fungi A fungus ( : fungi or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. These organisms are classified as a kingdom, separately from ...

and hyphochytridiomycota) serve as natural hosts. There is only one species in this genus: ''Rhizidiomyces virus''.Heterocapsa circularisquama DNA virus 01

Structure

Viruses in ''Rhizidiovirus'' are non-enveloped, with icosahedral, round, and isometric geometries. The diameter is around 60 nm. The genome is non segmented, linear double stranded DNA and ~25.5 kilobases in length. It has a

guanine Guanine () ( symbol G or Gua) is one of the four main nucleobases found in the nucleic acids DNA and RNA, the others being adenine, cytosine, and thymine (uracil in RNA). In DNA, guanine is paired with cytosine. The guanine nucleoside is c ...

cytosine Cytosine () ( symbol C or Cyt) is one of the four nucleobases found in DNA and RNA, along with adenine, guanine, and thymine (uracil in RNA). It is a pyrimidine derivative, with a heterocyclic aromatic ring and two substituents attached (an ...

content of 42%. It encodes at least 14 protein with molecular weights between 84.5 and 26 kilo

Dalton Dalton may refer to: Science * Dalton (crater), a lunar crater * Dalton (program), chemistry software * Dalton (unit) (Da), the atomic mass unit * John Dalton, chemist, physicist and meteorologist Entertainment * Dalton (Buffyverse), minor ch ...

Life cycle

The virus seems to remain latent within the host until the host is stressed.Dawe VH, Kuhn CW (1983) Virus-like particles in the aquatic fungus, ''Rhizidiomyces''. Virology 130(1):10–20. Virons first appear in the

nucleus Nucleus ( : nuclei) is a Latin word for the seed inside a fruit. It most often refers to: *Atomic nucleus, the very dense central region of an atom * Cell nucleus, a central organelle of a eukaryotic cell, containing most of the cell's DNA Nucl ...

. This is followed by the disintegration of the host nucleus and

cytoplasm In cell biology, the cytoplasm is all of the material within a eukaryotic cell, enclosed by the cell membrane, except for the cell nucleus. The material inside the nucleus and contained within the nuclear membrane is termed the nucleoplasm. ...

and their replacement by paracrystalline structures composed of virons. These structures first appear in association with the mitochondria. After the nucleus and cytoplasm have been replaced the cell wall breaks down followed with release of virons into the medium. Vertical transmission also appears to be possible. DNA-templated transcription is the method of transcription. Fungi and hyphochytridiomycota serve as the natural host.

References

External links

Viralzone: Rhizidiovirus

ICTV
{{Taxonbar, from=Q7320734 Double-stranded DNA viruses Virus genera