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-Structure paper
タイトル | Structural basis for mismatch surveillance by CRISPR-Cas9. |
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ジャーナル・号・ページ | Nature, Vol. 603, Issue 7900, Page 343-347, Year 2022 |
掲載日 | 2022年3月2日 |
著者 | Jack P K Bravo / Mu-Sen Liu / Grace N Hibshman / Tyler L Dangerfield / Kyungseok Jung / Ryan S McCool / Kenneth A Johnson / David W Taylor / |
PubMed 要旨 | CRISPR-Cas9 as a programmable genome editing tool is hindered by off-target DNA cleavage, and the underlying mechanisms by which Cas9 recognizes mismatches are poorly understood. Although Cas9 ...CRISPR-Cas9 as a programmable genome editing tool is hindered by off-target DNA cleavage, and the underlying mechanisms by which Cas9 recognizes mismatches are poorly understood. Although Cas9 variants with greater discrimination against mismatches have been designed, these suffer from substantially reduced rates of on-target DNA cleavage. Here we used kinetics-guided cryo-electron microscopy to determine the structure of Cas9 at different stages of mismatch cleavage. We observed a distinct, linear conformation of the guide RNA-DNA duplex formed in the presence of mismatches, which prevents Cas9 activation. Although the canonical kinked guide RNA-DNA duplex conformation facilitates DNA cleavage, we observe that substrates that contain mismatches distal to the protospacer adjacent motif are stabilized by reorganization of a loop in the RuvC domain. Mutagenesis of mismatch-stabilizing residues reduces off-target DNA cleavage but maintains rapid on-target DNA cleavage. By targeting regions that are exclusively involved in mismatch tolerance, we provide a proof of concept for the design of next-generation high-fidelity Cas9 variants. |
リンク | Nature / PubMed:35236982 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.76 - 3.56 Å |
構造データ | EMDB-24833, PDB-7s4u: EMDB-24834: EMDB-24835, PDB-7s4v: EMDB-24836: EMDB-24837: EMDB-24838, PDB-7s4x: |
化合物 | ChemComp-MG: ChemComp-HOH: |
由来 |
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キーワード | IMMUNE SYSTEM/DNA/RNA / Cas9 / Mismatch / IMMUNE SYSTEM-DNA-RNA complex |