siRNAs compete with miRNAs for methylation by HEN1 in Arabidopsis.

siRNAs compete with miRNAs for methylation by HEN1 in Arabidopsis.
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DOI:
10.1093/nar/gkq348
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发表时间:
2010-09
影响因子:
14.9
通讯作者:
Chen X
Chen X
中科院分区:
生物学2区
文献类型:
--
作者:
Yu B;Bi L;Zhai J;Agarwal M;Li S;Wu Q;Ding SW;Meyers BC;Vaucheret H;Chen X

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植物 microRNA (miRNA) 和小干扰 RNA (siRNA) 在 3' 末端核苷酸上带有 2'-O-甲基。该甲基是由甲基转移酶蛋白 HEN1 合成后添加的,可保护小 RNA 免受针对 3'-OH 的酶活性的影响。对拟南芥中部分功能丧失的 hen1-2 等位基因的抑制子进行诱变筛选,发现了恢复 miRNA 甲基化的第二位点突变。这些突变影响 DNA 依赖性 RNA 聚合酶 IV (Pol IV) 的两个亚基,这对于 24 nt 内源 siRNA 的生物合成至关重要。 RNA依赖性RNA聚合酶2(内源24-nt siRNA生物发生的另一个重要基因)的突变也挽救了hen1-2的miRNA甲基化缺陷,揭示了siRNA对HEN1介导的miRNA甲基化的先前未曾怀疑的负面影响。此外,我们的研究结果表明哥伦比亚遗传背景中存在 HEN1 活性的负修饰因子。
Plant microRNAs (miRNAs) and small interfering RNAs (siRNAs) bear a 2′-O-methyl group on the 3′-terminal nucleotide. This methyl group is post-synthetically added by the methyltransferase protein HEN1 and protects small RNAs from enzymatic activities that target the 3′-OH. A mutagenesis screen for suppressors of the partial loss-of-function hen1-2 allele in Arabidopsis identified second-site mutations that restore miRNA methylation. These mutations affect two subunits of the DNA-dependent RNA polymerase IV (Pol IV), which is essential for the biogenesis of 24 nt endogenous siRNAs. A mutation in RNA-dependent RNA polymerase 2, another essential gene for the biogenesis of endogenous 24-nt siRNAs, also rescued the defects in miRNA methylation of hen1-2, revealing a previously unsuspected, negative influence of siRNAs on HEN1-mediated miRNA methylation. In addition, our findings imply the existence of a negative modifier of HEN1 activity in the Columbia genetic background.
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