+検索条件
-Structure paper
| タイトル | Structural basis for the activation of a compact CRISPR-Cas13 nuclease. |
|---|---|
| ジャーナル・号・ページ | Nat Commun, Vol. 14, Issue 1, Page 5845, Year 2023 |
| 掲載日 | 2023年9月20日 |
著者 | Xiangyu Deng / Emmanuel Osikpa / Jie Yang / Seye J Oladeji / Jamie Smith / Xue Gao / Yang Gao / ![]() |
| PubMed 要旨 | The CRISPR-Cas13 ribonucleases have been widely applied for RNA knockdown and transcriptional modulation owing to their high programmability and specificity. However, the large size of Cas13 ...The CRISPR-Cas13 ribonucleases have been widely applied for RNA knockdown and transcriptional modulation owing to their high programmability and specificity. However, the large size of Cas13 effectors and their non-specific RNA cleavage upon target activation limit the adeno-associated virus based delivery of Cas13 systems for therapeutic applications. Herein, we report detailed biochemical and structural characterizations of a compact Cas13 (Cas13bt3) suitable for adeno-associated virus delivery. Distinct from many other Cas13 systems, Cas13bt3 cleaves the target and other nonspecific RNA at internal "UC" sites and is activated in a target length-dependent manner. The cryo-electron microscope structure of Cas13bt3 in a fully active state illustrates the structural basis of Cas13bt3 activation. Guided by the structure, we obtain engineered Cas13bt3 variants with minimal off-target cleavage yet maintained target cleavage activities. In conclusion, our biochemical and structural data illustrate a distinct mechanism for Cas13bt3 activation and guide the engineering of Cas13bt3 applications. |
リンク | Nat Commun / PubMed:37730702 / PubMed Central |
| 手法 | EM (単粒子) |
| 解像度 | 3.5 Å |
| 構造データ | EMDB-29433, PDB-8fti: |
| 由来 |
|
キーワード | RNA BINDING PROTEIN/RNA / Cas13bt3-crRNA-target RNA ternary complex / activated state / RNA BINDING PROTEIN / RNA BINDING PROTEIN-RNA complex |
ムービー
コントローラー
構造ビューア
万見文献について



著者
リンク

planctomycetota bacterium (バクテリア)
キーワード