Secoviridae: a proposed family of plant viruses within the order Picornavirales that combines the families Sequiviridae and Comoviridae, the unassigned genera Cheravirus and Sadwavirus, and the proposed genus Torradovirus
Secoviridae: a proposed family of plant viruses within the order Picornavirales that combines the families Sequiviridae and Comoviridae, the unassigned genera Cheravirus and Sadwavirus, and the proposed genus Torradovirus
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DOI：
10.1007/s00705-009-0367-z
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发表时间：
2009-05-01
影响因子：
2.7
通讯作者：
Wetzel, Thierry
中科院分区：
文献类型：
--
作者：
Sanfacon, Helene;Wellink, Joan;Wetzel, Thierry
小核糖核酸病毒目包括几种植物病毒，其目前被分类为Comoviridae（Comovirus属、Fabavirus属和Nepovirus属）和Equiviridae（Equivirus属和Waikavirus属）以及未分配的Cheravirus属和Sadwavirus属。这些病毒与其他小核糖核酸病毒具有共同的特性（颗粒结构，具有多蛋白表达策略的正链RNA基因组，包括III型解旋酶，3C样半胱氨酸蛋白酶和I型RNA依赖性RNA聚合酶的共同复制块）。然而，它们也具有独特的特性，使其与其他小核糖核酸病毒区分开来。它们感染植物并使用专门的蛋白质或蛋白质结构域在宿主中移动。在基于其复制蛋白的系统发育分析中，这些病毒在小核糖核酸病毒目分支内形成单独的独特谱系。为了在分类学水平上认识到这些共同特性，我们建议创建一个称为“Secoviridae”的新家族，以包括Comovirus、Fabavirus、Nepovirus、Cheravirus、Sadwavirus、Sequivirus和Waikavirus属。两种新发现的植物病毒与提议的Secoviridae家族成员具有共同的特性，但具有不同的特定基因组组织。在系统发育重建中，它们在Secoviridae谱系内形成单独的子分支。我们建议创建一个新的属，称为Torradovirus（模式种，番茄Torradovirus），并将该属分配给建议的Secoviridae科。
The order Picornavirales includes several plant viruses that are currently classified into the families Comoviridae (genera Comovirus, Fabavirus and Nepovirus) and Sequiviridae (genera Sequivirus and Waikavirus) and into the unassigned genera Cheravirus and Sadwavirus. These viruses share properties in common with other picornavirales (particle structure, positive-strand RNA genome with a polyprotein expression strategy, a common replication block including type III helicase, a 3C-like cysteine proteinase and type I RNA-dependent RNA polymerase). However, they also share unique properties that distinguish them from other picornavirales. They infect plants and use specialized proteins or protein domains to move through their host. In phylogenetic analysis based on their replication proteins, these viruses form a separate distinct lineage within the picornavirales branch. To recognize these common properties at the taxonomic level, we propose to create a new family termed "Secoviridae" to include the genera Comovirus, Fabavirus, Nepovirus, Cheravirus, Sadwavirus, Sequivirus and Waikavirus. Two newly discovered plant viruses share common properties with members of the proposed family Secoviridae but have distinct specific genomic organizations. In phylogenetic reconstructions, they form a separate sub-branch within the Secoviridae lineage. We propose to create a new genus termed Torradovirus (type species, Tomato torrado virus) and to assign this genus to the proposed family Secoviridae.