8dk2

CryoEM structure of Pseudomonas aeruginosa PA14 JetABC in an unclamped state trapped in ATP dependent dimeric form

spinqualitylabelsall models 8dk2, resolution 4.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8dk2 is a 10 chain structure with sequence from Pseudomonas aeruginosa PA14 and Synthetic construct. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 4.1Å Ligands: AGS, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Self versus non-self discrimination is a key element of innate and adaptive immunity across life. In bacteria, CRISPR-Cas and restriction-modification systems recognize non-self nucleic acids through their sequence and their methylation state, respectively. Here, we show that the Wadjet defense system recognizes DNA topology to protect its host against plasmid transformation. By combining cryoelectron microscopy with cross-linking mass spectrometry, we show that Wadjet forms a complex similar to the bacterial condensin complex MukBEF, with a novel nuclease subunit similar to a type II DNA topoisomerase. Wadjet specifically cleaves closed-circular DNA in a reaction requiring ATP hydrolysis by the structural maintenance of chromosome (SMC) ATPase subunit JetC, suggesting that the complex could use DNA loop extrusion to sense its substrate's topology, then specifically activate the nuclease subunit JetD to cleave plasmid DNA. Overall, our data reveal how bacteria have co-opted a DNA maintenance machine to specifically recognize and destroy foreign DNAs through topology sensing. The SMC-family Wadjet complex protects bacteria from plasmid transformation by recognition and cleavage of closed-circular DNA.,Deep A, Gu Y, Gao YQ, Ego KM, Herzik MA Jr, Zhou H, Corbett KD Mol Cell. 2022 Nov 3;82(21):4145-4159.e7. doi: 10.1016/j.molcel.2022.09.008. Epub , 2022 Oct 6. PMID:36206765 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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