Structure of the mini-RNA-guided endonuclease CRISPR-Cas12j3
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- Structure of the mini-RNA-guided endonuclease CRISPR-Cas12j3
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CRISPR-Cas12j is a recently identified family of miniaturized RNA-guided endonucleases from phages. These ribonucleoproteins provide a compact scaffold gathering all key activities of a genome editing tool. We provide the first structural insight into the Cas12j family by determining the cryoEM structure of Cas12j3/R-loop complex after DNA cleavage. The structure reveals the machinery for PAM recognition, hybrid assembly and DNA cleavage. The crRNA-DNA hybrid is directed to the stop domain that splits the hybrid, guiding the T-strand towards the catalytic site. The conserved RuvC insertion is anchored in the stop domain and interacts along the phosphate backbone of the crRNA in the hybrid. The assembly of a hybrid longer than 12-nt activates catalysis through key functional residues in the RuvC insertion. Our findings suggest why Cas12j unleashes unspecific ssDNA degradation after activation. A site-directed mutagenesis analysis supports the DNA cutting mechanism, providing new avenues to redesign CRISPR-Cas12j nucleases for genome editing.
Originalsprog | Engelsk |
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Artikelnummer | 4476 |
Tidsskrift | Nature Communications |
Vol/bind | 12 |
Antal sider | 12 |
ISSN | 2041-1723 |
DOI | |
Status | Udgivet - 2021 |
Bibliografisk note
© 2021. The Author(s).
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