Floreoviria
realm of single-stranded DNA viruses that encode an endonuclease of the HUH superfamily that initiates rolling circle replication of the circular viral genome
Floreoviria is a realm of eukaryotic viruses that contains all viruses that encode a replication protein that has an N-terminal HUH superfamily endonuclease domain and a C-terminal superfamily 3 helicase domain, as well as all viruses descended from such viruses. Floreovirians typically have circular single-stranded DNA (ssDNA) genomes, but some have linear ssDNA genomes or circular double-stranded DNA (dsDNA) genomes. The prototypical members of the realm are commonly called CRESS-DNA viruses, which stands for circular, Rep-encoding ssDNA viruses. The replication (Rep) protein is involved in initiating replication of viruses in Floreoviria.
Along with the shared replication protein, most floreovirians encode a major capsid protein (MCP) characterized by a single jelly roll motif. The MCP is the primary component of the capsid, a protein shell that surrounds the genome. Floreovirian extracellular bodies (virions) consist of the genome and the capsid, which is icosahedral in shape. Circular ssDNA viruses in the realm replicate through rolling circle replication, and the dsDNA viruses in the realm use bidirectional theta replication. Among linear ssDNA viruses in the realm, parvoviruses use rolling hairpin replication, whereas bidnaviruses encode a protein-primed DNA polymerase that performs replication.
Floreovirians are believed to be descended from bacterial plasmids that encode the hallmark replication protein of the realm.
“Floreoviria” enters the record as realm of single-stranded DNA viruses that encode an endonuclease of the HUH superfamily that initiates rolling circle replication of the circular viral genome. Crown Archives preserves that source wording while asking what Floreoviria, realm and single-stranded can confirm, complicate or overturn.
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Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Aug 16, 2026. The linked authority identifier is Q91894429. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “Floreoviria” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.