Incomplete DRB4-dependence of the DCL4-mediated antiviral defense.
Incomplete DRB4-dependence of the DCL4-mediated antiviral defense.
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DCL4 介导的抗病毒防御不完全依赖 DRB4
DOI:
10.1038/srep39244
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发表时间:
2016-12-16
影响因子:
4.6
通讯作者:
Qu F
中科院分区:
文献类型:
--
作者:
Zhang X;Zhang X;Wu K;Liu Z;Li D;Qu F
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 generateddcl2drb4anddcl4drb4double knockout mutants, and subjected them to infections with CPB-CC-PDS, a turnip crinkle virus mutant capable of inducing silencing of thePHYTOENE DESATURASEgene. Thedcl2drb4double knockouts caused a far smaller loss of antiviral silencing thandcl2dcl4.In addition, although bothdrb4anddcl4single mutants permitted a consistent (but small) increase in viral RNA levels, thedrb4mutant 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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