首页|Methyltransferase ATMETTL5 writes m~6A on 18S ribosomal RNA to regulate translation in Arabidopsis

Methyltransferase ATMETTL5 writes m~6A on 18S ribosomal RNA to regulate translation in Arabidopsis

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Aberrant RNA modifications can lead to dysregulated gene expression and impeded growth in plants. Ribosomal RNA (rRNA) constitutes a substantial portion of total RNA, while the precise functions and molecular mechanisms underlying rRNA modifications in plants remain largely elusive. ? Here, we elucidated the exclusive occurrence of the canonical RNA modification N~6-methyladenosine (m~6A) solely 18S rRNA, but not 25S rRNA. We identified a completely uncharacterized protein, ATMETTL5, as an Arabidopsis m~6A methyltransferase responsible for installing m~6A methylation at the 1771 site of the 18S rRNA. ATMETTL5 is ubiquitously expressed and localized in both nucleus and cytoplasm, mediating rRNA m~6A methylation. ? Mechanistically, the loss of ATMETTL5-mediated methylation results in attenuated translation. Furthermore, we uncovered the role of ATMETTL5-mediated methylation in coordinating blue light-mediated hypocotyl growth by regulating the translation of blue light-related messenger RNAs (mRNAs), specifically HYH and PRR9. ? Our findings provide mechanistic insights into how rRNA modification regulates ribosome function in mRNA translation and the response to blue light, thereby advancing our understanding of the role of epigenetic modifications in precisely regulating mRNA translation in plants.

18S rRNA m~6A methyltransferaseArabidopsisATMETTL5blue light responsetranslation

Peizhe Song、Enlin Tian、Zhihe Cai、Xu Chen、Shuyan Chen、Kemiao Yu、Hanxiao Bian、Kai He、Guifang Jia

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Synthetic and Functional Biomolecules Center, Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China

Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, 100871, China

Laboratory of Fruit Quality Biology, Zhejiang Provincial Key Laboratory of Horticultural Plant Integrative Biology, Zhejiang University, Zijingang Campus, Hangzhou, 310058, China

State Key Laboratory of Protein and Plant Gene Research, School of Advanced Agricultural Sciences, Peking University, Beijing, 100871, China

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2024

10.1111/nph.20034

The New Phytologist

The New Phytologist

ISSN：0028-646X
年,卷(期)：2024.244(2)
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