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-Structure paper
| タイトル | Structural determinants of DNA cleavage by a CRISPR HNH-Cascade system. |
|---|---|
| ジャーナル・号・ページ | Mol Cell, Vol. 84, Issue 16, Page 3154-33162.e5, Year 2024 |
| 掲載日 | 2024年8月22日 |
著者 | Seiichi Hirano / Han Altae-Tran / Soumya Kannan / Rhiannon K Macrae / Feng Zhang / ![]() |
| PubMed 要旨 | Canonical prokaryotic type I CRISPR-Cas adaptive immune systems contain a multicomponent effector complex called Cascade, which degrades large stretches of DNA via Cas3 helicase-nuclease activity. ...Canonical prokaryotic type I CRISPR-Cas adaptive immune systems contain a multicomponent effector complex called Cascade, which degrades large stretches of DNA via Cas3 helicase-nuclease activity. Recently, a highly precise subtype I-F1 CRISPR-Cas system (HNH-Cascade) was found that lacks Cas3, the absence of which is compensated for by the insertion of an HNH endonuclease domain in the Cas8 Cascade component. Here, we describe the cryo-EM structure of Selenomonas sp. HNH-Cascade (SsCascade) in complex with target DNA and characterize its mechanism of action. The Cascade scaffold is complemented by the HNH domain, creating a ring-like structure in which the unwound target DNA is precisely cleaved. This structure visualizes a unique hybrid of two extensible biological systems-Cascade, an evolutionary platform for programmable DNA effectors, and an HNH nuclease, an adaptive domain with a spectrum of enzymatic activity. |
リンク | Mol Cell / PubMed:39111310 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.5 Å |
| 構造データ | EMDB-43729, PDB-8w1p: |
| 由来 |
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キーワード | IMMUNE SYSTEM / CRISPR-Cas / Genome engineering / RNA-guided DNA endonuclease / Non-coding RNA / HNH nuclease |
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selenomonas sp. (バクテリア)
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