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-Structure paper
タイトル | Structural basis for human mitochondrial tRNA maturation. |
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ジャーナル・号・ページ | Nat Commun, Vol. 15, Issue 1, Page 4683, Year 2024 |
掲載日 | 2024年6月1日 |
著者 | Vincent Meynier / Steven W Hardwick / Marjorie Catala / Johann J Roske / Stephanie Oerum / Dimitri Y Chirgadze / Pierre Barraud / Wyatt W Yue / Ben F Luisi / Carine Tisné / |
PubMed 要旨 | The human mitochondrial genome is transcribed into two RNAs, containing mRNAs, rRNAs and tRNAs, all dedicated to produce essential proteins of the respiratory chain. The precise excision of tRNAs by ...The human mitochondrial genome is transcribed into two RNAs, containing mRNAs, rRNAs and tRNAs, all dedicated to produce essential proteins of the respiratory chain. The precise excision of tRNAs by the mitochondrial endoribonucleases (mt-RNase), P and Z, releases all RNA species from the two RNA transcripts. The tRNAs then undergo 3'-CCA addition. In metazoan mitochondria, RNase P is a multi-enzyme assembly that comprises the endoribonuclease PRORP and a tRNA methyltransferase subcomplex. The requirement for this tRNA methyltransferase subcomplex for mt-RNase P cleavage activity, as well as the mechanisms of pre-tRNA 3'-cleavage and 3'-CCA addition, are still poorly understood. Here, we report cryo-EM structures that visualise four steps of mitochondrial tRNA maturation: 5' and 3' tRNA-end processing, methylation and 3'-CCA addition, and explain the defined sequential order of the tRNA processing steps. The methyltransferase subcomplex recognises the pre-tRNA in a distinct mode that can support tRNA-end processing and 3'-CCA addition, likely resulting from an evolutionary adaptation of mitochondrial tRNA maturation complexes to the structurally-fragile mitochondrial tRNAs. This subcomplex can also ensure a tRNA-folding quality-control checkpoint before the sequential docking of the maturation enzymes. Altogether, our study provides detailed molecular insight into RNA-transcript processing and tRNA maturation in human mitochondria. |
リンク | Nat Commun / PubMed:38824131 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.47 - 4.5 Å |
構造データ | EMDB-16543, PDB-8cbk: EMDB-16544, PDB-8cbl: EMDB-16545, PDB-8cbm: EMDB-16547, PDB-8cbo: EMDB-16667: Consensus Refinement - Map 1 EMDB-16668: Local refinement - Map 2 EMDB-16669: Cryo-EM structure of human mitochondrial RNase P in complex with mitochondrial pre-tRNA-His(5,Ser) EMDB-16673: Consensus Refinement - Map 1 EMDB-16674: Local refinement - Map 2 (mask 1) EMDB-16675: Local refinement - map 3 (Mask 2) EMDB-16690: Consensus Refinement - Map 1 EMDB-16691: Local refinement - Map 2 (Mask 1) EMDB-16692: Global Refinement - Map 1 |
化合物 | ChemComp-NAD: ChemComp-ZN: ChemComp-SAH: ChemComp-MG: ChemComp-HOH: ChemComp-CDP: |
由来 |
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キーワード | RNA BINDING PROTEIN / RNA maturation / RNA modification / mitochondrial tRNA / RNA methyltransferase / MRPP1 / MRPP2 / MRPP3 / m6A / RNA binding / RNA recognition |