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Molecular characterization of a novel narnavirus from the plant-pathogenic fungus Ustilaginoidea virens

文献类型： 外文期刊

作者： Zhao, Wenhua 1 ; He, Zhenrui 1 ; Liao, Sisi 1 ; Yang, Mei 1 ; Yang, Yingqing 2 ; Cheng, Baoping 3 ; Zhou, Erxun 1 ;

作者机构： 1.South China Agr Univ, Coll Plant Protect, Guangdong Prov Key Lab Microbial Signals & Dis Con, Guangzhou 510642, Peoples R China

2.Jiangxi Acad Agr Sci, Inst Plant Protect, Nanchang 330200, Peoples R China

3.Guangdong Acad Agr Sci, Guangdong Prov Key Lab High Technol Plant Protect, Key Lab Green Prevent & Control Fruits & Vegetable, Inst Plant Protect,Minist Agr & Rural Affairs, Guangzhou 510642, Guangdong, Peoples R China

期刊名称：ARCHIVES OF VIROLOGY （ 影响因子：2.5； 五年影响因子：2.2 ）

ISSN： 0304-8608

年卷期： 2025 年 170 卷 3 期

页码：

收录情况： SCI

摘要： Mycoviruses are viruses that infect fungi, yeasts, and oomycetes and can replicate and multiply within them. They are widely distributed in plant- and animal-pathogenic fungi. In this study, we identified a novel positive-sense single-stranded RNA (+ ssRNA) mycovirus from Ustilaginoidea virens strain Uv339, the causal agent of rice false smut (RSF), and this virus was named "Ustilaginoidea virens narnavirus 5" (UvNV5). Sequence analysis revealed that UvNV5 has a complete genome length of 2091 nt and contains a single open reading frame (ORF) (nt 131-2038) encoding a 635-amino-acid (aa) RNA-dependent RNA polymerase (RdRp) with a molecular mass of 71.8 kDa. BLASTp analysis revealed that the RdRp of UvNV5 shares only 38.22% amino acid sequence identity with that of Ustilaginoidea virens narnavirus virus 13, its closest relative. Phylogenetic analysis indicated that UvNV5 clustered within a branch alongside members of the class Amabiliviricetes. In summary, UvNV5 is a novel mycovirus of the class Amabiliviricetes that infects U. virens.

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