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-Structure paper
| タイトル | Structural basis for target DNA cleavage and guide RNA processing by CRISPR-Casλ2. |
|---|---|
| ジャーナル・号・ページ | Commun Biol, Vol. 8, Issue 1, Page 876, Year 2025 |
| 掲載日 | 2025年6月5日 |
著者 | Satoshi N Omura / Lauren E Alfonse / Alexa Ornstein / Hayato Morinaga / Hisato Hirano / Yuzuru Itoh / Gabrielle Munoz / Anthony J Garrity / Gregory R Hoffman / Tia DiTommaso / Winston X Yan / David R Cheng / David A Scott / Zachary Maben / Osamu Nureki / ![]() |
| PubMed 要旨 | RNA-guided CRISPR-Cas nucleases are widely used as versatile genome-engineering tools. Among the diverse CRISPR-Cas effectors, CRISPR-Casλ-also referred to as Cas12n-is a recently identified ...RNA-guided CRISPR-Cas nucleases are widely used as versatile genome-engineering tools. Among the diverse CRISPR-Cas effectors, CRISPR-Casλ-also referred to as Cas12n-is a recently identified miniature type V nuclease encoded in phage genomes. Given its demonstrated nuclease activity in both mammalian and plant cells, Casλ has emerged as a promising candidate for genome-editing applications. However, the precise molecular mechanisms of Casλ family enzymes remain poorly understood. In this study, we report the identification and detailed biochemical and structural characterizations of CRISPR-Casλ2. The cryo-electron microscopy structures of Casλ2 in five different functional states unveiled the dynamic domain rearrangements during its activation. Our biochemical analyses indicated that Casλ2 processes its precursor crRNA to a mature crRNA using the RuvC active site through a unique ruler mechanism, in which Casλ2 defines the spacer length of the mature crRNA. Furthermore, structural comparisons of Casλ2 with Casλ1 and CasΦ highlighted the diversity and conservation of phage-encoded type V CRISPR-Cas enzymes. Collectively, our findings augment the mechanistic understanding of diverse CRISPR-Cas nucleases and establish a framework for rational engineering of the CRISPR-Casλ-based genome-editing platform. |
リンク | Commun Biol / PubMed:40473912 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 2.84 - 3.06 Å |
| 構造データ | EMDB-61037, PDB-9izm: EMDB-61038, PDB-9izp: EMDB-61039, PDB-9izq: EMDB-61040, PDB-9izr: EMDB-61041, PDB-9izs: |
| 化合物 | ![]() ChemComp-MG: ![]() ChemComp-GS: ![]() ChemComp-SC: ![]() ChemComp-AS: |
| 由来 |
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キーワード | DNA BINDING PROTEIN / CRISPR-CAS12 / GENOME ENGINEERING / HYDROLASE-RNA-DNA COMPLEX |
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