School of Life Science and Technology, China Pharmaceutical University, Nanjing, China.
State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, China.
Crit Rev Biochem Mol Biol. 2021 Apr;56(2):137-148. doi: 10.1080/10409238.2020.1869174. Epub 2021 Jan 8.
Translation occurring on cytoplasmic mRNA is precisely governed at three consecutive stages, including initiation, elongation and termination. A growing body of evidence has revealed that an emerging epitranscriptomic code N-methyladenosine (mA), asymmetrically present in a large subset of coding and non-coding transcripts, is crucially required for mediating the translatomic stability. Through recruiting translation machinery proteins, serving as a physical barrier, or directing RNA structural rearrangement and mRNA looping formation, mA has been decoded to modulate translational dynamics through potentially influencing the progress of different stages, thereby forming an additional layer of complexity to the regulation of translation. In this review, we summarize the current understanding of how mA guides mRNA translation under normal and stress conditions, highlighting the divergent molecular mechanisms of multifarious regulation of mA-mediated translation.
翻译发生在细胞质 mRNA 上,是在三个连续阶段精确调控的,包括起始、延伸和终止。越来越多的证据表明,一种新兴的转录后修饰密码子 N6-甲基腺苷(m6A),在很大一部分编码和非编码转录本中不对称存在,对于介导翻译后稳定性是至关重要的。m6A 通过招募翻译机制蛋白,作为物理屏障,或指导 RNA 结构重排和 mRNA 环形成,已被解码来调节翻译动力学,可能通过影响不同阶段的进展,从而为翻译的调控增加了一个额外的复杂性层。在这篇综述中,我们总结了目前对 m6A 如何在正常和应激条件下指导 mRNA 翻译的理解,强调了 m6A 介导的翻译的多种调节的不同分子机制。