Orterviralesis an order that contains all accepted species of single-strandedRNAviruses that replicate through aDNAintermediate (Group VI) and all accepted species of double-stranded DNA viruses (exceptHepadnaviridae) that replicate through an RNA intermediate (Group VII). [1][2]The name is derived from the reverse ofretro.[3]
| Ortervirales | |
|---|---|
| |
| HI-virión | |
Virus classification
| |
| (unranked): | Virus |
| Realm: | Riboviria |
| Kingdom: | Pararnavirae |
| Phylum: | Artverviricota |
| Class: | Revtraviricetes |
| Order: | Ortervirales |
| Families | |
All reverse-transcribing viruses possess significant similarities to each other. Theirreverse transcriptaseproteins share a common origin. Moreover, belpaoviruses, metaviruses, pseudoviruses, and retroviruses have other features in common. Theirpolymeraseproteins are similar in structure and includeaspartic protease(retroviral aspartyl protease) and anintegrasebelonging to the DDE recombinase superfamily (seeRecombination-activating gene [structure]). They also share similarcapsidand nucleocapsid proteins/domains.[4]Caulimoviruses also share some features with belpaoviruses, metaviruses, pseudoviruses, and retroviruses such as a homologousaspartate protease.On the other hand,Hepadnaviridaefamily is part of a sister order ofOrterviralescalledBlubervirales.[1]
Taxonomy
editThere are five families in this order:
- FamilyBelpaoviridae–LTR retrotransposon,Bel/Pao family
- FamilyMetaviridae–LTR retrotransposon,Ty3/gypsy family
- FamilyPseudoviridae–LTR retrotransposon,Ty1/copia family
- FamilyRetroviridae– Retroviruses, e.g.HIV
- FamilyCaulimoviridae– dsDNA-RT viruses infecting plants
References
edit- ^abKrupovic, M; Blomberg, J; Coffin, JM; Dasgupta, I; Fan, H; Geering, AD; Gifford, R; Harrach, B; Hull, R; Johnson, W; Kreuze, JF; Lindemann, D; Llorens, C; Lockhart, B; Mayer, J; Muller, E; Olszewski, N; Pappu, HR; Pooggin, M; Richert-Pöggeler, KR; Sabanadzovic, S; Sanfaçon, H; Schoelz, JE; Seal, S; Stavolone, L; Stoye, JP; Teycheney, PY; Tristem, M; Koonin, EV; Kuhn, JH (4 April 2018)."Ortervirales:New virus order unifying five families of reverse-transcribing viruses ".Journal of Virology.92(12): e00515–18.doi:10.1128/JVI.00515-18.PMC5974489.PMID29618642.
- ^"Taxonomy".International Committee on Taxonomy of Viruses (ICTV).Retrieved2018-05-23.
- ^Jens H. Kuhn, Mart Krupovic,et al.:Creation of new order, Ortervirales, for 5 families of reverse-transcribing viruses,ICTVProposal (Taxoprop) 2017.013D,DOI:10.1340/RG.2.2.24914.04804
- ^Krupovic, M; Koonin, EV (2017)."Homologous Capsid Proteins Testify to the Common Ancestry of Retroviruses, Caulimoviruses, Pseudoviruses, and Metaviruses".Journal of Virology.91(12): e00210–17.doi:10.1128/JVI.00210-17.PMC5446648.PMID28356531.