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-Structure paper
| タイトル | Structural basis for multi-subunit DNA-dependent RNA polymerase catalytic activity. |
|---|---|
| ジャーナル・号・ページ | Mol Cell, Year 2026 |
| 掲載日 | 2026年4月30日 |
著者 | Andreas U Mueller / Seth A Darst / ![]() |
| PubMed 要旨 | Multi-subunit DNA-dependent RNA polymerase (RNAP) is the central enzyme of transcription, yet its catalytic mechanism remains obscure because high-resolution structures of intermediates with native ...Multi-subunit DNA-dependent RNA polymerase (RNAP) is the central enzyme of transcription, yet its catalytic mechanism remains obscure because high-resolution structures of intermediates with native substrates are not available. We visualized E. coli RNAP on a promoter DNA template with nucleoside triphosphate substrates engaged in active RNA synthesis by cryo-electron microscopy. From this heterogeneous mixture, we determined five high-resolution structures of initial transcribing complexes, including a true Michaelis complex (MC) and a post-catalytic product complex (PC). The MC reveals key conformational transitions during catalysis. Waters in the MC and PC structures show striking overlap with those in corresponding S. cerevisiae RNA polymerase II (RNAPII) structures (see related paper by Li et al.), pointing to functional importance. Together, these results establish that RNAP catalyzes nucleotidyl transfer through a positional (entropic) mechanism, revealing structural determinants of the first step of gene expression. |
リンク | Mol Cell / PubMed:42066755 |
| 手法 | EM (単粒子) |
| 解像度 | 2.5 - 3.1 Å |
| 構造データ | EMDB-73122, PDB-9ymu: EMDB-73123, PDB-9ymv: EMDB-73124: de novo initial transcribing RNA polymerase with 5-mer RNA CCAUC (RPitc5a) EMDB-73125, PDB-9ymx: EMDB-73126, PDB-9ymy: ![]() EMDB-73127: De novo initial transcribing RNA polymerase on T7A1 promoter (weak downstream) ![]() EMDB-73128: De novo initial transcribing RNA polymerase on T7A1 promoter (empty channel) ![]() EMDB-73130: RNA polymerase open complex on T7A1 promoter (RPo) EMDB-73131, PDB-9yn0: |
| 化合物 | ![]() ChemComp-MG: ![]() ChemComp-ZN: ![]() ChemComp-CTP: ![]() ChemComp-HOH: ![]() ChemComp-ATP: ![]() ChemComp-POP: |
| 由来 |
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キーワード | TRANSCRIPTION / RNA polymerase / initial transcribing complex / substrate-bound / nucleotide addition / pre-catalytic / post-catalytic / promoter escape / transcription initiation / sigma 70 region 1.1 |
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escherichia phage t7 (ファージ)
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