فيروسات مجزأة

Partitiviridae
Emd-5161.jpg
CryoEM of Penicillium stoloniferum virus S capsid, EMD-5161[1]
ODR.Partiti.Fig1.v1.png
TEM of Penicillium stoloniferum virus S
تصنيف الفيروسات e
أصنوفة غير معروفة (أصلحها): Partitiviridae

فيروسات مجزأة إنگليزية: Partitiviridae عائلة فيروسات بجينوم ثنائي سلسلة الرنا يصنف ضمن المجموعة الثالثة في تصنيف بلتيمور، يصيب النباتات و الفطور ، اٍسمها (باللاتينية: partitius) بمعنى مجزأة، وسميت بذلك لأن لديها جينوم مجزأ.

تضم هذه العائلة ثلاث أجناس هي:

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Structure

Penicillium stoloniferum virus F (PsV-F), Gammapartititvirus, and PsV-F CP dimer

Viruses in the family Partitiviridae are non-enveloped with icosahedral geometries and T=1 symmetry.[2] The diameter of partitiviruses is around 25–43 nm.[3]


Genome

Genome of atkinsonella hypoxylon virus (AhV) of genus Betapartitivirus

Partitiviruses have double-stranded RNA genomes divided into two genomic segments, and there may be additional subgenomic segments. The two genome segments are packaged in separate virus particles. They code for two separate proteins. The first segment codes for the RNA-dependent RNA polymerase (RdRp), and the second segment codes for the coat protein. The segments are around 1.4–3.0 kbp in length, while the total genome length is around 3.0–4.8 kbp.[3][2]

Life cycle

Viral replication is cytoplasmic. Entry into the host cell is achieved by penetration into the host cell. Replication follows the double-stranded RNA virus replication model. Double-stranded RNA virus transcription is the method of transcription. The virus exits the host cell by cell-to-cell movement. Fungi and plants serve as the natural host.[3][2] Cryspoviruses infect apicomplexian protozoa of the genus Cryptosporidium,[4] while viruses of the other genera infect plants and fungi. It has been suggested that they can also infect bacteria.

Phylogenetics

Based on the RNA polymerase gene this group can be divided into four clades (I-IV).[5] Four isolates from animals and protozoans form a fifth clade. Clades I–IV consist of mixtures of partitivirus-like sequences from plants and fungi.[بحاجة لمصدر]

Taxonomy

Phylogenetic tree of Partitiviridae

There are five recognized genera within the Partitiviridae family. There are an additional fifteen species in the family unassigned to a genus:[3][6]

Alphapartitivirus

Betapartitivirus

Cryspovirus

Deltapartitivirus

Gammapartitivirus

Unassigned to a genus:

References

  1. ^ Tang, J.; Pan, J.; Havens, W. M.; Ochoa, W. F.; Guu, T. S. Y.; Ghabrial, S. A.; Nibert, M. L.; Tao, Y. J.; Baker, T. S. (2010). "Backbone Trace of Partitivirus Capsid Protein from Electron Cryomicroscopy and Homology Modeling". Biophysical Journal. 99 (2): 685–694. Bibcode:2010BpJ....99..685T. doi:10.1016/j.bpj.2010.04.058. PMC 2905076. PMID 20643089.
  2. ^ أ ب ت "Viral Zone". ExPASy. Retrieved 15 June 2015.
  3. ^ أ ب ت ث خطأ استشهاد: وسم <ref> غير صحيح؛ لا نص تم توفيره للمراجع المسماة ICTVReport
  4. ^ Nibert ML, Woods KM, Upton SJ, Ghabrial SA (2009) Cryspovirus: a new genus of protozoan viruses in the family Partitiviridae. Arch Virol 154(12):1959–1965
  5. ^ Liu H, Fu Y, Xie J, Cheng J, Ghabrial SA, Li G, Yi X, Jiang D (2012) Discovery of Novel dsRNA Viral Sequences by In Silico Cloning and Implications for Viral Diversity, Host Range and Evolution. PLoS One. 2012;7(7):e42147.
  6. ^ خطأ استشهاد: وسم <ref> غير صحيح؛ لا نص تم توفيره للمراجع المسماة ICTV

وصلات خارجية

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