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Binding to RNA regulates Set1 function

机译:结合RNA调节Set1功能

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The Set1 family of histone H3 lysine 4 (H3K4) methyltransferases is highly conserved from yeast to human. Here we show that the Set1 complex (Set1C) directly binds RNA in vitro through the regions that comprise the double RNA recognition motifs (dRRM) and N-SET domain within Set1 and its subunit Spp1. To investigate the functional relevance of RNA binding, we performed UV RNA crosslinking (CRAC) for Set1 and RNA polymerase II in parallel with ChIP-seq experiments. Set1 binds nascent transcripts through its dRRM. RNA binding is important to define the appropriate topology of Set1C distribution along transcription units and correlates with the efficient deposition of the H3K4me3 mark. In addition, we uncovered that Set1 binds to different classes of RNAs to levels that largely exceed the levels of binding to the general population of transcripts, suggesting the Set1 persists on these RNAs after transcription. This class includes RNAs derived from SET1 , Ty1 retrotransposons, specific transcription factors genes and snRNAs (small nuclear RNAs). We propose that Set1 modulates adaptive responses, as exemplified by the post-transcriptional inhibition of Ty1 retrotransposition.
机译:从酵母到人类,组蛋白H3赖氨酸4(H3K4)甲基转移酶的Set1家族高度保守。在这里,我们显示Set1复合物(Set1C)通过包含Set1及其亚基Spp1中的双RNA识别基序(dRRM)和N-SET域的区域直接在体外结合RNA。为了研究RNA结合的功能相关性,我们与ChIP-seq实验并行进行了Set1和RNA聚合酶II的UV RNA交联(CRAC)。 Set1通过其dRRM绑定新生的转录本。 RNA结合对于定义沿转录单位的Set1C分布的适当拓扑非常重要,并与H3K4me3标记的有效沉积相关。此外,我们发现Set1与不同类别的RNA结合的水平大大超过了与一般转录本群体的结合水平,这表明Set1在转录后仍保留在这些RNA上。该类别包括衍生自SET1,Ty1逆转座子,特定转录因子基因和snRNA(小核RNA)的RNA。我们建议Set1调节自适应响应,如Ty1逆转录的转录后抑制例证。

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