Structure of the mini-RNA-guided endonuclease CRISPR-Cas12j3

Arturo Carabias, Anders Fuglsang, Piero Temperini, Tillmann Pape, Nicholas Sofos, Stefano Stella, Simon Erlendsson and Guillermo Montoya ()
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Arturo Carabias: Faculty of Health and Medical Sciences University of Copenhagen
Anders Fuglsang: Faculty of Health and Medical Sciences University of Copenhagen
Piero Temperini: Faculty of Health and Medical Sciences University of Copenhagen
Tillmann Pape: Faculty of Health and Medical Sciences University of Copenhagen
Nicholas Sofos: Faculty of Health and Medical Sciences University of Copenhagen
Stefano Stella: Faculty of Health and Medical Sciences University of Copenhagen
Simon Erlendsson: Faculty of Health and Medical Sciences University of Copenhagen
Guillermo Montoya: Faculty of Health and Medical Sciences University of Copenhagen

Nature Communications, 2021, vol. 12, issue 1, 1-12

Abstract: Abstract 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.

Date: 2021
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DOI: 10.1038/s41467-021-24707-3

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