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-Structure paper
| タイトル | The mitochondrial methylation potential gates mitoribosome assembly. |
|---|---|
| ジャーナル・号・ページ | Nat Commun, Vol. 16, Issue 1, Page 5388, Year 2025 |
| 掲載日 | 2025年6月25日 |
著者 | Ruth I C Glasgow / Vivek Singh / Lucía Peña-Pérez / Alissa Wilhalm / Marco F Moedas / David Moore / Florian A Rosenberger / Xinping Li / Ilian Atanassov / Mira Saba / Miriam Cipullo / Joanna Rorbach / Anna Wedell / Christoph Freyer / Alexey Amunts / Anna Wredenberg / ![]() |
| PubMed 要旨 | S-adenosylmethionine (SAM) is the principal methyl donor in cells and is essential for mitochondrial gene expression, influencing RNA modifications, translation, and ribosome biogenesis. Using direct ...S-adenosylmethionine (SAM) is the principal methyl donor in cells and is essential for mitochondrial gene expression, influencing RNA modifications, translation, and ribosome biogenesis. Using direct long-read RNA sequencing in mouse tissues and embryonic fibroblasts, we show that processing of the mitochondrial ribosomal gene cluster fails in the absence of mitochondrial SAM, leading to an accumulation of unprocessed precursors. Proteomic analysis of ribosome fractions revealed these precursors associated with processing and assembly factors, indicating stalled biogenesis. Structural analysis by cryo-electron microscopy demonstrated that SAM-dependent methylation is required for peptidyl transferase centre formation during mitoribosome assembly. Our findings identify a critical role for SAM in coordinating mitoribosomal RNA processing and large subunit maturation, linking cellular methylation potential to mitochondrial translation capacity. |
リンク | Nat Commun / PubMed:40562754 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.85 - 7.42 Å |
| 構造データ | EMDB-47791, PDB-9e9c: EMDB-52044, PDB-9hcc: EMDB-52045, PDB-9hcd: EMDB-52046, PDB-9hce: EMDB-52047, PDB-9hcf: EMDB-52048, PDB-9hcg: EMDB-52049, PDB-9hch: ![]() EMDB-52408: Mouse mitochondrial large subunit assembly intermediate in complex with MRM2 dimer with uL16m bound (SAMC Knock-out) ![]() EMDB-52430: Mouse mitoribosome large subunit assembly intermediate bound to NSUN4, MTERF4 and the MALSU1-L0R8F8-mtACP complex, State C2 (SAMC knock-out) |
| 化合物 | ![]() ChemComp-MG: ![]() ChemComp-ZN: ![]() ChemComp-FES: ![]() ChemComp-GNP: ![]() ChemComp-SAH: ![]() ChemComp-HOH: |
| 由来 |
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キーワード | RIBOSOME / mitochondria / ribosome assembly / large subunit / assembly intermediate |
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