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
期刊:
影响因子:
4.6
通讯作者:
Qu F
Qu F
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Zhang X;Zhang X;Wu K;Liu Z;Li D;Qu F

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拟南芥的双链RNA结合蛋白DRB 4先前被证明有助于DICER-LIKE 4(DCL 4)介导的大小为21个核苷酸(nt)的病毒小干扰RNA(vsiRNA)的生物合成。然而,目前尚不清楚是否所有21-nt vsiRNA都依赖于这种DRB 4-DCL 4伙伴关系。为了解决这个问题,我们产生了ddcl 2drb 4和dcl 4drb 4双敲除突变体,并将它们用CPB-CC-PDS感染,CPB-CC-PDS是一种能够诱导PHYTOENE DESATURASE基因沉默的芜菁皱缩病毒突变体。dcl 2drb 4双敲除导致的抗病毒沉默损失远小于cl 2dcl 4。此外,尽管drb 4和dcl 4单突变体都允许病毒RNA水平的一致(但很小)增加,但drb 4突变体与21-nt vsiRNAs的减少不太明显相关。因此,DCL 4抗病毒活性的一个重要子集是DRB 4独立的,并且可能涉及补偿DRB 4损失的其他DRB蛋白。
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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