Virions are isometric, 60 nm in diameter (Figure 1).
The buoyant density of virions in CsCl is 1.31 g cm−3; S20,w is 625. Virions contain 10% nucleic acid.
Virions contain a single molecule of dsDNA with a Mr of 16.8 106 and a G+C ratio of 42%.
Virions contain at least 14 polypeptides with sizes in the range of 26−84.5 kDa.
Particles appear first in the nucleus.
The virus appears to be transmitted in a latent form in the zoospores of its host Rhizidiomyces sp. Activation of the virus, which occurs under stress conditions such as heat, poor nutrition, or aging, results in cell lysis. Rhizidiomyces sp. is a water mold belonging to the kingdom Protista (Chromalveolata); it is no longer classified in the kingdom Fungi. Therefore, there are currently no recognized dsDNA viruses that naturally replicate in fungi.
No research has been done on this dsDNA virus system since 1983.
Species names are in italic script; names of isolates are in roman script. Sequence accession numbers [ ] and assigned abbreviations ( ) are also listed.
Rhizidio: from name of the host Rhizidiomyces sp.
Dawe, V.H. and Kuhn, C.W. (1983). Virus-like particles in the aquatic fungus, Rhizidiomyces. Virology, 130, 10-20.
Dawe, V.H. and Kuhn, C.W. (1983). Isolation and characterization of a double-stranded DNA mycovirus infecting the aquatic fungus, Rhizidiomyces. Virology, 130, 21-28.