Jumat, 21 Oktober 2011

Family Endornaviridae Virus

The Endornavirus is a genus of plant viruses. The non-enveloped viral capsid holds a non-segmented single molecule of double-stranded RNA, 14000-18000 nucleotides long. No true viral particles or structures have been observed.

Several known species include:
Oryza rufipogon endornavirus - Oryza rufipogon virus
Oryza sativa endornavirus - Oryza sativa virus
Phaseolus vulgaris endornavirus - Phaseolus vulgaris virus
Vicia faba endornavirus - Vicia faba virus

The family Endornaviridae contains several members from diverse hosts, including plants, fungi and oomycetes. They are found as large dsRNA elements with a nick in the coding strand. All members encode a conserved RNA-dependent RNA polymerase, but no other domain that is conserved among all members. Based on the conserved domain database comparison the various domains have different origins, indicating a highly modular evolutionary history. In some cases, domains with similar putative functions are found that are derived from different protein families, indicating convergent evolution for a required function.

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