6ltu

Crystal structure of Cas12i2 ternary complex with double Mg2+ bound in catalytic pocket

spinqualitylabelsall models 6ltu, resolution 2.57Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6ltu is a 5 chain structure with sequence from Synthetic construct and Unidentified. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.57Å Ligands: EDO, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed To understand how the RuvC catalytic domain of Class 2 Cas proteins cleaves DNA, it will be necessary to elucidate the structures of RuvC-containing Cas complexes in their catalytically competent states. Cas12i2 is a Class 2 type V-I CRISPR-Cas endonuclease that cleaves target dsDNA by an unknown mechanism. Here, we report structures of Cas12i2-crRNA-DNA complexes and a Cas12i2-crRNA complex. We reveal the mechanism of DNA recognition and cleavage by Cas12i2, and activation of the RuvC catalytic pocket induced by a conformational change of the Helical-II domain. The seed region (nucleotides 1-8) is dispensable for RuvC activation, but the duplex of the central spacer (nucleotides 9-15) is required. We captured the catalytic state of Cas12i2, with both metal ions and the ssDNA substrate bound in the RuvC catalytic pocket. Together, our studies provide significant insights into the DNA cleavage mechanism by RuvC-containing Cas proteins. Structural basis for two metal-ion catalysis of DNA cleavage by Cas12i2.,Huang X, Sun W, Cheng Z, Chen M, Li X, Wang J, Sheng G, Gong W, Wang Y Nat Commun. 2020 Oct 16;11(1):5241. doi: 10.1038/s41467-020-19072-6. PMID:33067443 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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