Cryo-EM structures of human m(6)A writer complexes.

Cryo-EM structures of human m(6)A writer complexes.
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DOI:
10.1038/s41422-022-00725-8
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发表时间:
2022-11
期刊:
影响因子:
44.1
通讯作者:
Zhang, Kaiming
Zhang, Kaiming
中科院分区:
生物学1区
文献类型:
--
作者:
Su, Shichen;Li, Shanshan;Deng, Ting;Gao, Minsong;Yin, Yue;Wu, Baixing;Peng, Chao;Liu, Jianzhao;Ma, Jinbiao;Zhang, Kaiming

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N6-甲基腺苷 (m6A) 是真核信使 RNA 中最丰富的核糖核苷酸修饰。 m6A“写入器”由催化亚基 m6A-METTL 复合物 (MAC) 和调节亚基 m6A-METTL 相关复合物 (MACOM) 组成,后者对于酶活性至关重要。在这里,我们以 3.0-Å 分辨率报道了 MACOM 的冷冻电子显微镜 (cryo-EM) 结构,揭示了 WTAP 和 VIRMA 形成了 MACOM 的核心结构,并且 ZC3H13 通过结合 VIRMA 来拉伸构象。此外,MACOM-MAC复合物的4.4-Å分辨率冷冻电镜图,结合交联质谱和GST下拉分析,阐明了m6A writer复合物的合理模型,其中MACOM主要通过WTAP和METTL3相互作用与MAC结合。结合体外 RNA 底物结合和 m6A 甲基转移酶活性测定,我们的结果说明了 MACOM 如何组装并与 MAC 相互作用以形成活性 m6A 写入复合物的分子基础。
N6-methyladenosine (m6A) is the most abundant ribonucleotide modification among eukaryotic messenger RNAs. The m6A “writer” consists of the catalytic subunit m6A-METTL complex (MAC) and the regulatory subunit m6A-METTL-associated complex (MACOM), the latter being essential for enzymatic activity. Here, we report the cryo-electron microscopy (cryo-EM) structures of MACOM at a 3.0-Å resolution, uncovering that WTAP and VIRMA form the core structure of MACOM and that ZC3H13 stretches the conformation by binding VIRMA. Furthermore, the 4.4-Å resolution cryo-EM map of the MACOM–MAC complex, combined with crosslinking mass spectrometry and GST pull-down analysis, elucidates a plausible model of the m6A writer complex, in which MACOM binds to MAC mainly through WTAP and METTL3 interactions. In combination with in vitro RNA substrate binding and m6A methyltransferase activity assays, our results illustrate the molecular basis of how MACOM assembles and interacts with MAC to form an active m6A writer complex.
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