SRSF3 recruits DROSHA to the basal junction of primary microRNAs.

SRSF3 recruits DROSHA to the basal junction of primary microRNAs.
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SRSF3 将 DROSHA 招募到初级 microRNA 的基底连接处

DOI:
10.1261/rna.065862.118
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发表时间:
2018-07
期刊:
RNA (New York, N.Y.)
影响因子:
--
通讯作者:
Nguyen TA
Nguyen TA
中科院分区:
其他
文献类型:
--
作者:
Kim K;Nguyen TD;Li S;Nguyen TA

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微处理器复合物由RNase III DROSHA和DGCR8二聚体组成,可切割初级microRNA转录物(pri-miRNA)以启动microRNA (miRNA)成熟。pri - mirna是茎环RNA,约79%的pri - mirna至少含有三种主要和保守的RNA基序中的一种,即UG、UGU和CNNC。我们最近证明了pri- mirna的基部UG和顶部UGU基序分别与DROSHA和DGCR8相互作用。它们有助于将微处理器定位在pri-miRNA上的正确方向,其中DROSHA和DGCR8分别定位于pri-miRNA的基部和根尖连接处。此外,位于微处理器裂解位点约17个核苷酸(nt)处的CNNC与SRSF3 (SRp20)相互作用,刺激微处理器处理pri-miRNAs。然而,这种刺激背后的机制尚不清楚。在这项研究中,我们发现SRSF3以cnnc依赖的方式将DROSHA招募到基结,从而增强微处理器的活性。此外,通过在不同位置生成含有CNNC的各种pri-miRNA底物,我们证明了这种刺激仅发生在CNNC位于微处理器裂解位点约17 nt处时。我们的研究结果揭示了SRSF3在pri-miRNA加工中的分子机制,并支持了之前提出的CNNC在SRSF3增强的pri-miRNA加工中的高度保守地位的解释。
The Microprocessor complex, consisting of an RNase III DROSHA and the DGCR8 dimer, cleaves primary microRNA transcripts (pri-miRNAs) to initiate microRNA (miRNA) maturation. Pri-miRNAs are stem–loop RNAs, and ∼79% of them contain at least one of the three major and conserved RNA motifs, UG, UGU, and CNNC. We recently demonstrated that the basal UG and apical UGU motifs of pri-miRNAs interact with DROSHA and DGCR8, respectively. They help orient Microprocessor on pri-miRNA in a proper direction in which DROSHA and DGCR8 localize to the basal and apical pri-miRNA junctions, respectively. In addition, CNNC, located at ∼17 nucleotides (nt) from the Microprocessor cleavage site, interacts with SRSF3 (SRp20) to stimulate Microprocessor to process pri-miRNAs. The mechanism underlying this stimulation, however, is unknown. In this study, we discovered that SRSF3 recruits DROSHA to the basal junction in a CNNC-dependent manner, thereby enhancing Microprocessor activity. Furthermore, by generating various pri-miRNA substrates containing CNNC at different locations, we demonstrated that such stimulation only occurs when CNNC is located at ∼17 nt from the Microprocessor cleavage site. Our findings reveal the molecular mechanism of SRSF3 in pri-miRNA processing and support the previously proposed explanation for the highly conserved position of CNNC in SRSF3-enhanced pri-miRNA processing.
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