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-Structure paper
| タイトル | Human mitochondrial RNA polymerase structures reveal transcription start site and slippage mechanism. |
|---|---|
| ジャーナル・号・ページ | Mol Cell, Vol. 85, Issue 16, Page 3137-33150.e7, Year 2025 |
| 掲載日 | 2025年8月21日 |
著者 | Jiayu Shen / Quinten Goovaerts / Yogeeshwar Ajjugal / Brent De Wijngaert / Kalyan Das / Smita S Patel / ![]() |
| PubMed 要旨 | Transcription of the human mitochondrial DNA is initiated by POLRMT and initiation factors mitochondrial transcription factor A (TFAM) and mitochondrial transcription factor B2 (TFB2M). We present ...Transcription of the human mitochondrial DNA is initiated by POLRMT and initiation factors mitochondrial transcription factor A (TFAM) and mitochondrial transcription factor B2 (TFB2M). We present cryo-electron microscopy (cryo-EM) structures of three transcription initiation intermediates (pre-catalytic IC3 [pre-IC3], slipped-IC3, and slipped pre-IC4) catalyzing RNA synthesis by normal and slippage pathways with fully resolved transcription bubbles and RNA transcripts starting from the +1 or -1 position. The structural and biochemical studies reveal mechanisms of promoter melting, start site selection, and slippage synthesis. Promoter melting begins at -4 with base-specific interactions of template -4 and -3 guanines with POLRMT and non-template -1 adenine with TFB2M. The NT-stabilizing loop (KLDPRSGGVIKPP) and Y209 of TFB2M and W1026 of POLRMT interact with the non-template strand to guide initiation from the +1 start site. The -1 position is not an alternative start site but supports slippage initiation by base-pairing with a slipped or rebound 2-nt RNA. Cryo-EM resolved additional apo and dimeric complexes whose populations may regulate transcription initiation. |
リンク | Mol Cell / PubMed:40712586 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.1 - 3.5 Å |
| 構造データ | EMDB-51727, PDB-9gzm: EMDB-51728, PDB-9gzn: EMDB-51729, PDB-9gzo: EMDB-53853, PDB-9r95: EMDB-53854, PDB-9r96: |
| 化合物 | ![]() ChemComp-GTP: ![]() ChemComp-MG: |
| 由来 |
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キーワード | TRANSCRIPTION / POLRMT / TFB2M / TFAM / transcription initiation / polymerase / h-mtRNAP / mtRNAP / RNA polymerase / mitochondrial DNA / mitochondria / slippage / human mitochondrial RNA polymerase / y-mtRNAP / MTF1 / RPO41 / DNA transcription / initiation / mitochondrial / DNA / RNA / RNAP |
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homo sapiens (ヒト)
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