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-Structure paper
| タイトル | Cryo-EM structure of a natural RNA nanocage. |
|---|---|
| ジャーナル・号・ページ | Nature, Vol. 644, Issue 8078, Page 1107-1115, Year 2025 |
| 掲載日 | 2025年6月16日 |
著者 | Xiaobin Ling / Dmitrij Golovenko / Jianhua Gan / Jinbiao Ma / Andrei A Korostelev / Wenwen Fang / ![]() |
| PubMed 要旨 | Long (>200 nucleotides) non-coding RNAs (lncRNAs) play important roles in diverse aspects of life. Over 20 classes of lncRNAs have been identified in bacteria and bacteriophages through comparative ...Long (>200 nucleotides) non-coding RNAs (lncRNAs) play important roles in diverse aspects of life. Over 20 classes of lncRNAs have been identified in bacteria and bacteriophages through comparative genomics analyses, but their biological functions remain largely unexplored. Owing to the large sizes, the structural determinants of most lncRNAs also remain uncharacterized. Here, we report the structures of two natural RNA nanocages formed by the ROOL (rumen-originating, ornate, large) lncRNA found in bacterial and phage genomes. The cryo-electron microscopy (cryo-EM) structures at 2.9-Å resolution reveal that ROOL RNAs form an octameric nanocage with a diameter of 28 nm and an axial length of 20 nm, in which the hollow inside features poorly ordered regions. The octamer is stabilized by numerous tertiary and quaternary interactions, including triple-strand A-minors, for which we propose the term 'A-minor staples'. The structure of an isolated ROOL monomer at 3.2-Å resolution indicates that nanocage assembly involves a strand-swapping mechanism resulting in quaternary kissing loops. Finally, we show that ROOL RNA fused to an RNA aptamer, transfer RNA or microRNA retains its structure, forming a nanocage with radially displayed cargoes. Our findings, therefore, may enable engineering of novel RNA nanocages as delivery vehicles for research and therapeutic applications. |
リンク | Nature / PubMed:40523399 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.93 - 3.59 Å |
| 構造データ | EMDB-48386, PDB-9mm6: EMDB-48389, PDB-9mme: EMDB-48391, PDB-9mmg: ![]() EMDB-49873: ROOLfirm-tetramer |
| 化合物 | ![]() ChemComp-K: ![]() ChemComp-MG: |
| 由来 |
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キーワード | RNA / natural RNA nanocage / drug delivery / cryo-EM |
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enterococcus faecalis jh1 (乳酸球菌)
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