Incomplete DRB4-dependence of the DCL4-mediated antiviral defense

文献类型： 外文期刊

第一作者： Zhang, Xiaofeng

作者： Zhang, Xiaofeng;Zhang, Xiuchun;Wu, Kunxin;Liu, Zhixin;Zhang, Xiaofeng;Zhang, Xiuchun;Qu, Feng;Zhang, Xiaofeng;Zhang, Xiaofeng;Li, Dawei

作者机构：

期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）

ISSN： 2045-2322

年卷期： 2016 年 6 卷

页码：

收录情况： SCI

摘要： The double-stranded RNA-binding protein DRB4 of Arabidopsis was shown previously to contribute to the DICER-LIKE 4 (DCL4)-mediated biogenesis of viral small interfering RNAs (vsiRNAs) of 21 nucleotides (nt) in size. However, it is unclear whether all 21-nt vsiRNAs are dependent on this DRB4-DCL4 partnership. To resolve this question, we generated dcl2drb4 and dcl4drb4 double knockout mutants, and subjected them to infections with CPB-CC-PDS, a turnip crinkle virus mutant capable of inducing silencing of the PHYTOENE DESATURASE gene. The dcl2drb4 double knockouts caused a far smaller loss of antiviral silencing than dcl2dcl4. In addition, although both drb4 and dcl4 single mutants permitted a consistent (but small) increase in viral RNA levels, the drb4 mutant correlated with a less pronounced reduction of 21-nt vsiRNAs. Therefore, a substantial subset of DCL4 antiviral activity is DRB4-independent, and may involve other DRB proteins that compensate for loss of DRB4.

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