Regulation of translation by methylation multiplicity of 18S rRNA.

Regulation of translation by methylation multiplicity of 18S rRNA.
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DOI:
10.1016/j.celrep.2021.108825
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发表时间:
2021-03-09
期刊:
影响因子:
8.8
通讯作者:
Tu BP
Tu BP
中科院分区:
生物学1区
文献类型:
--
作者:
Liu K;Santos DA;Hussmann JA;Wang Y;Sutter BM;Weissman JS;Tu BP

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N6-甲基腺苷(m6 A)是一种保守的核糖核苷修饰,调节RNA代谢的许多方面。利用定量质谱,我们发现,普遍保守的串联腺苷在3′端的18 S rRNA,被认为是组成性二甲基化(m62 A),也是单甲基化(m6 A)。虽然以亚化学计量的量存在,但在酵母细胞和哺乳动物细胞系中,这些位置的m6 A响应于硫饥饿而显著增加。结合酵母遗传学和核糖体分析,我们提供的证据表明,携带m6 A的核糖体进行翻译不同于携带m62 A的核糖体,具有显着的特异性硫代谢基因。因此,我们的工作揭示了甲基化多重性作为调节翻译的机制。核糖体异质性已变得越来越明显。Liu等报道了一个rRNA甲基化形式的例子。他们显示18 S rRNA中的两个保守的腺苷被不同数量的甲基修饰。不同甲基化的核糖体翻译不同,这表明甲基化多重性是调节翻译的机制。
N6-methyladenosine (m6A) is a conserved ribonucleoside modification that regulates many facets of RNA metabolism. Using quantitative mass spectrometry, we find that the universally conserved tandem adenosines at the 3′ end of 18S rRNA, thought to be constitutively di-methylated (m62A), are also mono-methylated (m6A). Although present at substoichiometric amounts, m6A at these positions increases significantly in response to sulfur starvation in yeast cells and mammalian cell lines. Combining yeast genetics and ribosome profiling, we provide evidence to suggest that m6A-bearing ribosomes carry out translation distinctly from m62A-bearing ribosomes, featuring a striking specificity for sulfur metabolism genes. Our work thus reveals methylation multiplicity as a mechanism to regulate translation. Ribosome heterogeneity has become increasingly evident. Liu et al. report an example in the form of rRNA methylation. They show two conserved adenosines in the 18S rRNA are modified with varying numbers of methyl groups. Differentially methylated ribosomes translate differently, suggesting methylation multiplicity as a mechanism to regulate translation.
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