Molecular characterization of the largest and smallest genome segments, S1 and S12, of Rice gall dwarf virus

文献类型： 外文期刊

第一作者： Zhang, Heng-Mu

作者： Zhang, Heng-Mu;Yang, Nan;Xin, Xing;Chen, Jian-Ping;Adams, Michael J.

作者机构：

关键词： rice gall dwarf virus;phytoreovirus RdRp;reoviridae;phylogeny;sequence analysis

期刊名称：VIRUS GENES （ 影响因子：2.332； 五年影响因子：2.0 ）

ISSN： 0920-8569

年卷期： 2007 年 35 卷 3 期

页码：

收录情况： SCI

摘要： The nucleotide sequences of segments S I and S12 of a Chinese isolate of Rice gall dwarf virus (RGDV) were determined. This provides the first complete sequences of these segments. The complete sequence of S1, the largest genome segment of RGDV, was 4,505 nucleotides in length and was predicted to encode a large protein of 1,458 amino acids with a calculated molecular mass of nearly 166.2 kDa. The protein was related to that encoded by S I of Rice dwarf virus (RDV; 50% identity and 67% similarity) and (to a lesser extent) to some large proteins of other reoviruses. It appears to be an RNA-dependent RNA polymerase (RdRp) and is probably present in particles as a minor core protein. S12, the smallest genome segment of RGDV, was 853 nucleotides in length, encoding a single major protein of 206 amino acids with a calculated molecular mass of nearly 23.6 kDa. This protein, though a little larger than those of RDV S11 and Wound tumor virus (WTV) S12 in size, showed some similarity to them, especially in the conserved N-terminal region and may have RNA-binding properties. Despite having a common host plant, RDV and RGDV were not more closely related to one another than either of them was to WTV. Phylogenetic analysis of the RdRp showed that members of the genus Phytoreovirus were more closely related to those of the genus Rotavirus than to any other genus within the family Reoviridae.

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