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Depending on whether a lax or strict definition is used, the term virusoid may also include Hepatitis D virus (HDV). Like plant virusoids, HDV is circular, single-stranded, and supported by a helper virus (Hepatitis B virus) to form virions; however, the virions possess a much larger genome size (~1700 nt) and encode a protein.
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Viroids are small single-stranded, circular RNAs that are infectious pathogens. [1] [2] Unlike viruses, they have no protein coating.All known viroids are inhabitants of angiosperms (flowering plants), [3] and most cause diseases whose economic importance to humans varies widely. [4]
Virusoid; Von Magnus phenomenon; Vpx; Z. Zygotic induction This page was last edited on 2 August 2024, at 13:50 (UTC). Text is available under the Creative ...
A helper virus is a virus that allows an otherwise-deficient coinfecting virus to replicate. These can be naturally occurring as with Hepatitis D virus, which requires Hepatitis B virus to coinfect cells in order to replicate.
Lavidaviridae; Sputnik virophage: Virus classification (unranked): Virus: Realm: : Varidnaviria: Kingdom: Bamfordvirae: Phylum: Preplasmiviricota: Class: Maveriviricetes
Virus classification. Virus classification is the process of naming viruses and placing them into a taxonomic system similar to the classification systems used for cellular organisms.
In its natural state, a hammerhead RNA motif is a single strand of RNA. Although the cleavage takes place in the absence of protein enzymes, the hammerhead RNA itself is not a catalyst in its natural state, as it is consumed by the reaction (i.e. performs self-cleavage) and therefore cannot catalyze multiple turnovers.