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-Structure paper
| タイトル | Pre-splicing conformation and stepwise circularization of a group I intron in Azoarcus pre-tRNA. |
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| ジャーナル・号・ページ | Nat Commun, Vol. 17, Issue 1, Year 2026 |
| 掲載日 | 2026年3月20日 |
著者 | Yibao Hong / Jiashu Liu / Xiaojing Zhang / Ji Liu / Shanshan Li / Kaiming Zhang / ![]() |
| PubMed 要旨 | Group I introns are catalytic RNAs capable of self-splicing, yet structural insights into full-length precursor RNAs and post-splicing circularization have been limited. Here, we present cryo-EM ...Group I introns are catalytic RNAs capable of self-splicing, yet structural insights into full-length precursor RNAs and post-splicing circularization have been limited. Here, we present cryo-EM structures of the Azoarcus pre-tRNA system across key catalytic stages, including the full-length precursor in Pre-1S conformations, the linear intron, and the circular introns, at 2.8-3.3 Å resolution. These structures reveal a preformed P1 helix, register shifts during splicing, and a conformational flip of G37 that stabilizes the circularization site. Biochemical analyses confirm a two-step circularization mechanism, generating a secondary circular product via an alternative ligation site. Together, our results provide an atomic-level view of a group I intron system through splicing and circularization. This work uncovers structural principles governing RNA conformational dynamics, catalysis, and circular RNA formation, with broad implications for ribozyme engineering. |
リンク | Nat Commun / PubMed:41862486 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.86 - 3.27 Å |
| 構造データ | EMDB-64818, PDB-9v7n: EMDB-64819, PDB-9v7o: EMDB-64820, PDB-9v7p: EMDB-64821, PDB-9v7q: EMDB-66618, PDB-9x6b: |
| 化合物 | ![]() ChemComp-GMP: ![]() ChemComp-MG: |
| 由来 |
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キーワード | RNA / Azoarcus pre-tRNA(ILE) / self-splicing / pre-1S / RNA structure / circular intron / Azoarcus sp. BH72 pre-tRNA(ILE); second-step cyclization; c' intron |
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azoarcus olearius (バクテリア)
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