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-Structure paper
| タイトル | Supercoiled DNA recognition and cleavage control in topoisomerase VI. |
|---|---|
| ジャーナル・号・ページ | Nat Commun, Year 2026 |
| 掲載日 | 2026年2月16日 |
著者 | Daniel E Richman / Timothy J Wendorff / Fahad Rashid / Curtis Beck / Qianyun Yan / Haley R Johnson / Ryan A Eckerty / Jonathan M Fogg / Matthew L Baker / Lynn Zechiedrich / James M Berger / ![]() |
| PubMed 要旨 | Type II topoisomerases modulate DNA supercoiling and resolve chromosome entanglements. Type IIB topoisomerases, exemplified by DNA topoisomerase VI (Top6), are used by plants and archaea to support ...Type II topoisomerases modulate DNA supercoiling and resolve chromosome entanglements. Type IIB topoisomerases, exemplified by DNA topoisomerase VI (Top6), are used by plants and archaea to support endoreduplication and cell proliferation, respectively; homologs of Top6 further serve to initiate meiotic recombination in eukaryotes and constitute the nuclease portion of MksBEFG/Wadjet/Gabija bacterial defense systems. To understand how such factors act upon DNA, we determine structures of Top6 bound to supercoiled minicircles in cleaved and uncleaved states using single-particle electron cryo-microscopy. The structures show that Top6 binds a curved 74 bp region of the supercoiled minicircle DNA and that it cuts at a distinct deformability motif, explaining its preference for supercoiled substrates and highlighting the role of DNA plasticity in cleavage site selection. Dynamic protein-DNA interactions and an unanticipated tension sensor help recognize bent DNA and couple ATPase disposition to cleavage state activation. Our observations explain how DNA recognition and cleavage by type II topoisomerases are regulated by interdependent structural changes in DNA and the enzyme. |
リンク | Nat Commun / PubMed:41698922 |
| 手法 | EM (単粒子) |
| 解像度 | 2.5 - 4.0 Å |
| 構造データ | EMDB-49972, PDB-9o0g: EMDB-70206, PDB-9o7o: EMDB-70232, PDB-9o8p: EMDB-70239, PDB-9o8z: EMDB-70259, PDB-9o9m: |
| 化合物 | ![]() ChemComp-CA: ![]() ChemComp-ANP: ![]() ChemComp-K: ![]() ChemComp-MG: |
| 由来 |
|
キーワード | ISOMERASE/DNA / TOPRIM / GHKL / minicircle DNA / Spo11 / ISOMERASE-DNA complex |
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methanosarcina mazei go1 (古細菌)
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