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-Structure paper
| タイトル | Engineering a compact high-fidelity Staphylococcus aureus Cas9 variant with broader targeting range and mechanistic insights into its activation. |
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| ジャーナル・号・ページ | Nat Commun, Vol. 17, Issue 1, Year 2026 |
| 掲載日 | 2026年4月16日 |
著者 | Satoshi N Omura / Ryoya Nakagawa / Shohei Kajimoto / Sae Okazaki / Soh Ishiguro / Hideto Mori / Kosuke Onishi / Yuji Kashiwakura / Takafumi Hiramoto / Kio Horinaka / Mamoru Tanaka / Hisato Hirano / Kasey Jividen / Keitaro Yamashita / Shengdar Q Tsai / Nozomu Yachie / Tsukasa Ohmori / Hiroshi Nishimasu / Osamu Nureki / ![]() |
| PubMed 要旨 | Staphylococcus aureus Cas9 (SaCas9) is smaller than the widely used Streptococcus pyogenes Cas9 (SpCas9) and has been harnessed for gene therapy using an adeno-associated virus vector. However, ...Staphylococcus aureus Cas9 (SaCas9) is smaller than the widely used Streptococcus pyogenes Cas9 (SpCas9) and has been harnessed for gene therapy using an adeno-associated virus vector. However, SaCas9 requires a longer NNGRRT (where N is any nucleotide and R is A or G) protospacer adjacent motif (PAM) for target DNA recognition, thereby restricting the targeting range. Although PAM-relaxed Cas9 variants have been developed, expanded targeting is often accompanied by compromised target specificity. Here, we report the rational engineering of eSaCas9-NNG, a SaCas9 variant that recognizes relaxed NNG PAMs while maintaining high target fidelity, thereby overcoming a fundamental trade-off in Cas9-based genome editing. eSaCas9-NNG efficiently induces indels and base conversions at endogenous sites bearing NNG PAMs in human cells and mice, with editing efficiencies comparable to those of other PAM-relaxed nucleases, including SpRY, SpG, and iGeoCas9, but with reduced off-target activity. We further determine the cryo-electron microscopy structures of eSaCas9-NNG in five distinct functional states, revealing the structural basis for its relaxed PAM recognition, improved target specificity, and nuclease activation. Overall, our findings demonstrate that eSaCas9-NNG could be used as a versatile genome editing tool for in vivo gene therapy, and improve our mechanistic understanding of the diverse CRISPR-Cas9 nucleases. |
リンク | Nat Commun / PubMed:41991526 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.76 - 3.17 Å |
| 構造データ | EMDB-39941, PDB-8zcy: EMDB-39942, PDB-8zcz: EMDB-39944, PDB-8zd0: EMDB-39954, PDB-8zda: EMDB-63767, PDB-9mb6: EMDB-63768, PDB-9mb7: |
| 化合物 | ![]() ChemComp-MG: ![]() ChemComp-HOH: |
| 由来 |
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キーワード | DNA BINDING PROTEIN / CRISPR-CAS9 / GENOME ENGINEERING / HYDROLASE-RNA-DNA COMPLEX |
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