ジャーナル: Nat Commun / 年: 2021 タイトル: Structure of the mini-RNA-guided endonuclease CRISPR-Cas12j3. 著者: Arturo Carabias / Anders Fuglsang / Piero Temperini / Tillmann Pape / Nicholas Sofos / Stefano Stella / Simon Erlendsson / Guillermo Montoya / 要旨: 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 ...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.
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A: Cas_phi3 E: DNA (5'-D(P*GP*TP*AP*TP*CP*CP*CP*AP*TP*TP*AP*CP*CP*AP*GP*CP*TP*GP*AP*AP*TP*TP*AP*C)-3') G: DNA (5'-D(P*GP*TP*AP*AP*TP*TP*CP*AP*G)-3') C: DNA (5'-D(P*GP*G)-3') F: RNA (43-MER) ヘテロ分子