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-Structure paper
| タイトル | Direct trapping of the transport-segment DNA by the central domain of type IIA topoisomerases. |
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| ジャーナル・号・ページ | Sci Adv, Vol. 11, Issue 51, Page eadw2839, Year 2025 |
| 掲載日 | 2025年12月19日 |
著者 | Yuhui Xin / Runqi Xian / Congrong Liu / Oujia Zhang / Zihe Rao / Xuemei Li / Yutao Chen / ![]() |
| PubMed 要旨 | Type IIA topoisomerases modulate DNA topology by coordinating the cleavage of gate-segment DNA and the passage of transport-segment DNA-a mechanism conserved across species and essential for diverse ...Type IIA topoisomerases modulate DNA topology by coordinating the cleavage of gate-segment DNA and the passage of transport-segment DNA-a mechanism conserved across species and essential for diverse cellular processes. While gate-segment interactions have been extensively studied, direct structural evidence of transport-segment capture has remained elusive, limiting our understanding of the full catalytic cycle. Here, we present a cryo-electron microscopy structure of the T4 bacteriophage topoisomerase II with a transport-segment DNA bound directly to its central domain. The structure reveals conformational rearrangements in the central domain that accommodate the transport-segment DNA, suggesting an alternative sequence of events in which the enzyme sliding along the loosely bound religated gate segment may precede transport-segment passage through the coiled-coil gate. Supported by mutational and biochemical assays, our findings provide previously unidentified mechanistic insights and open potential avenues for the development of next-generation type IIA topoisomerase inhibitors. |
リンク | Sci Adv / PubMed:41406217 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.03 - 3.09 Å |
| 構造データ | EMDB-61621, PDB-9jnk: EMDB-61683, PDB-9jor: EMDB-63118, PDB-9lii: |
| 化合物 | ![]() ChemComp-MG: |
| 由来 |
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キーワード | ISOMERASE/DNA / Type IIA topoisomerase / T-segment DNA / ISOMERASE-DNA complex / ISOMERASE / topoisomerase II |
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enterobacteria phage t4 (ファージ)
homo sapiens (ヒト)
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