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-Structure paper
タイトル | Mechanistic and evolutionary insights into a type V-M CRISPR-Cas effector enzyme. |
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ジャーナル・号・ページ | Nat Struct Mol Biol, Vol. 30, Issue 8, Page 1172-1182, Year 2023 |
掲載日 | 2023年7月17日 |
著者 | Satoshi N Omura / Ryoya Nakagawa / Christian Südfeld / Ricardo Villegas Warren / Wen Y Wu / Hisato Hirano / Charlie Laffeber / Tsukasa Kusakizako / Yoshiaki Kise / Joyce H G Lebbink / Yuzuru Itoh / John van der Oost / Osamu Nureki / |
PubMed 要旨 | RNA-guided type V CRISPR-Cas12 effectors provide adaptive immunity against mobile genetic elements (MGEs) in bacteria and archaea. Among diverse Cas12 enzymes, the recently identified Cas12m2 (CRISPR- ...RNA-guided type V CRISPR-Cas12 effectors provide adaptive immunity against mobile genetic elements (MGEs) in bacteria and archaea. Among diverse Cas12 enzymes, the recently identified Cas12m2 (CRISPR-Cas type V-M) is highly compact and has a unique RuvC active site. Although the non-canonical RuvC triad does not permit dsDNA cleavage, Cas12m2 still protects against invading MGEs through transcriptional silencing by strong DNA binding. However, the molecular mechanism of RNA-guided genome inactivation by Cas12m2 remains unknown. Here we report cryo-electron microscopy structures of two states of Cas12m2-CRISPR RNA (crRNA)-target DNA ternary complexes and the Cas12m2-crRNA binary complex, revealing structural dynamics during crRNA-target DNA heteroduplex formation. The structures indicate that the non-target DNA strand is tightly bound to a unique arginine-rich cluster in the recognition (REC) domains and the non-canonical active site in the RuvC domain, ensuring strong DNA-binding affinity of Cas12m2. Furthermore, a structural comparison of Cas12m2 with TnpB, a putative ancestor of Cas12 enzymes, suggests that the interaction of the characteristic coiled-coil REC2 insertion with the protospacer-adjacent motif-distal region of the heteroduplex is crucial for Cas12m2 to engage in adaptive immunity. Collectively, our findings improve mechanistic understanding of diverse type V CRISPR-Cas effectors and provide insights into the evolution of TnpB to Cas12 enzymes. |
リンク | Nat Struct Mol Biol / PubMed:37460897 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.87 - 3.73 Å |
構造データ | EMDB-34803, PDB-8hhl: EMDB-34804, PDB-8hhm: EMDB-34824, PDB-8hio: |
化合物 | ChemComp-MG: ChemComp-ZN: |
由来 |
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キーワード | RNA BINDING PROTEIN / CRISPR-Cas / RNA BINDING PROTEIN-DNA COMPLEX |