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-Structure paper
| タイトル | Stepwise transcription stalling by the anti-cancer drug Actinomycin D and insights into short tandem repeat transcription inhibition. |
|---|---|
| ジャーナル・号・ページ | Nat Commun, Vol. 17, Issue 1, Year 2026 |
| 掲載日 | 2026年3月15日 |
著者 | Weiqi Zhao / Liulian Zhu / Yankai Liu / Wenjing Deng / Xu Yang / Lei Ye / Zhiyuan Lin / Kefeng Ding / Xin Yang / Xuekun Li / Jun Xu / ![]() |
| PubMed 要旨 | Short tandem repeats (STRs) comprise 6% of the human genome, and their transcription is linked to over 60 diseases. Actinomycin D (ACTD) is the first clinically approved anticancer antibiotic that ...Short tandem repeats (STRs) comprise 6% of the human genome, and their transcription is linked to over 60 diseases. Actinomycin D (ACTD) is the first clinically approved anticancer antibiotic that inhibits transcription through an incompletely understood mechanism. Here, using reconstituted yeast and mammalian systems, we investigate the mechanism of transcription inhibition and examine the impact of ACTD on STR transcription. We show that ACTD induces RNA polymerase II (Pol II) pausing at three distinct states and present structural snapshots of Pol II processing ACTD in these states. Furthermore, we examine ACTD's effects on Pol II transcribing five disease-linked, GC-rich STRs and resolve structures of Pol II in complex with ACTD during the transcription of CTG repeats associated with myotonic dystrophy type 1. Our findings reveal the structural basis of ACTD-mediated transcription inhibition and provide a framework for the rational modification of ACTD to target STR-associated disorders. |
リンク | Nat Commun / PubMed:41833943 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.46 - 3.09 Å |
| 構造データ | EMDB-62148, PDB-9k7f: EMDB-62264, PDB-9kd7: EMDB-62265, PDB-9kd8: EMDB-62266, PDB-9kd9: EMDB-62282, PDB-9kdn: EMDB-62283, PDB-9kdo: EMDB-62284, PDB-9kdq: |
| 化合物 | ![]() ChemComp-ZN: ![]() ChemComp-MG: |
| 由来 |
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キーワード | TRANSCRIPTION / RNA polymerase II / Elongation complex / Apo structure / RNA polymerase II elongation complex / actinomycin D / N-2 state structure / N-2 state / RNA polymerase II elongation complex actinomycin D / N-5 state / CTG repeats / CTG repeat / 3 ACTD / 4 CTG repeats |
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streptomyces sp. (バクテリア)
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