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-Structure paper
| タイトル | Disassembly activates Retron-Septu for antiphage defense. |
|---|---|
| ジャーナル・号・ページ | Science, Vol. 389, Issue 6762, Page eadv3344, Year 2025 |
| 掲載日 | 2025年8月21日 |
著者 | Chen Wang / Anthony D Rish / Emily G Armbruster / Jiale Xie / Anna B Loveland / Zhangfei Shen / Bradley Gu / Andrei A Korostelev / Joe Pogliano / Tian-Min Fu / ![]() |
| PubMed 要旨 | Retrons are antiphage defense systems that produce multicopy single-stranded DNA (msDNA) and hold promise for genome engineering. However, the mechanisms of defense remain unclear. The Retron-Septu ...Retrons are antiphage defense systems that produce multicopy single-stranded DNA (msDNA) and hold promise for genome engineering. However, the mechanisms of defense remain unclear. The Retron-Septu system integrates retron and Septu antiphage defenses. Cryo-electron microscopy structures reveal asymmetric nucleoprotein complexes comprising a reverse transcriptase, msDNA (a hybrid of msdDNA and msrRNA), and two PtuAB copies. msdDNA and msrRNA are essential for assembling this complex, with msrRNA adopting a conserved lariat-like structure that regulates reverse transcription. Notably, the assembled Retron-Septu complex is inactive, with msdDNA occupying the PtuA DNA binding site. Activation occurs upon disassembly, releasing PtuAB, which degrades single-stranded DNA to restrict phage replication. This "arrest-and-release" mechanism underscores the dynamic regulatory roles of msDNA, advancing our understanding of antiphage defense strategies. |
リンク | Science / PubMed:40504952 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.8 - 3.47 Å |
| 構造データ | EMDB-47737, PDB-9e8z: EMDB-47738, PDB-9e90: EMDB-47739, PDB-9e91: ![]() EMDB-47740: Retron Ec78 cryo-EM map at 3.01 A EMDB-70091, PDB-9o4a: |
| 化合物 | ![]() ChemComp-ADP: ![]() ChemComp-ZN: ![]() ChemComp-ATP: |
| 由来 |
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キーワード | ANTIVIRAL PROTEIN / ATPase / HNH-Endonuclease / Retron / msDNA / Dimer / IMMUNE SYSTEM / PtuA / PtuB / HNH nuclease |
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