5-methylcytosine promotes mRNA export - NSUN2 as the methyltransferase and ALYREF as an m(5)C reader.

5-methylcytosine promotes mRNA export - NSUN2 as the methyltransferase and ALYREF as an m(5)C reader.
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5-甲基胞嘧啶促进 mRNA 输出-NSUN2 作为甲基转移酶,ALYREF 作为 m5C 阅读器

DOI:
10.1038/cr.2017.55
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发表时间:
2017-05
期刊:
影响因子:
44.1
通讯作者:
Yang YG
Yang YG
中科院分区:
生物学1区
文献类型:
--
作者:
Yang X;Yang Y;Sun BF;Chen YS;Xu JW;Lai WY;Li A;Wang X;Bhattarai DP;Xiao W;Sun HY;Zhu Q;Ma HL;Adhikari S;Sun M;Hao YJ;Zhang B;Huang CM;Huang N;Jiang GB;Zhao YL;Wang HL;Sun YP;Yang YG

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5-甲基胞嘧啶(m5C)是在稳定和高度丰富的tRNA和rRNA以及mRNA中鉴定的转录后RNA修饰。然而,其在mRNA代谢中的调节作用在很大程度上仍然未知。在这里,我们揭示了m5C修饰富集在富含CG的区域和翻译起始位点的下游区域,并且在哺乳动物转录组中具有保守的,组织特异性的和动态的特征。此外,体外和体内研究表明,mRNA中m5C的形成主要由RNA甲基转移酶NSUN 2催化,而m5C则被mRNA输出衔接子ALYREF特异性识别。NSUN2调节BMPREF的核质穿梭、RNA结合亲和力和相关的mRNA输出。NSUN2耗竭后,通过重建野生型NSUN2而非甲基转移酶缺陷型NSUN2,可以恢复BMPREF介导的mRNA输出失调。我们的研究提供了哺乳动物转录组的全面的m5C配置文件,并建议m5C修饰在mRNA输出和转录后调控中的重要作用。
5-methylcytosine (m5C) is a post-transcriptional RNA modification identified in both stable and highly abundant tRNAs and rRNAs, and in mRNAs. However, its regulatory role in mRNA metabolism is still largely unknown. Here, we reveal that m5C modification is enriched in CG-rich regions and in regions immediately downstream of translation initiation sites and has conserved, tissue-specific and dynamic features across mammalian transcriptomes. Moreover, m5C formation in mRNAs is mainly catalyzed by the RNA methyltransferase NSUN2, and m5C is specifically recognized by the mRNA export adaptor ALYREF as shown by in vitro and in vivo studies. NSUN2 modulates ALYREF's nuclear-cytoplasmic shuttling, RNA-binding affinity and associated mRNA export. Dysregulation of ALYREF-mediated mRNA export upon NSUN2 depletion could be restored by reconstitution of wild-type but not methyltransferase-defective NSUN2. Our study provides comprehensive m5C profiles of mammalian transcriptomes and suggests an essential role for m5C modification in mRNA export and post-transcriptional regulation.
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