7n6i

ATP-bound TnsC-TniQ complex from ShCAST system

spinqualitylabelsall models 7n6i, resolution 3.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7n6i is a 12 chain structure with sequence from Scytonema hofmannii and Synthetic construct. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.9Å Ligands: ATP, MG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed CRISPR-associated transposition systems allow guide RNA-directed integration of a single DNA cargo in one orientation at a fixed distance from a programmable target sequence. We used cryo-electron microscopy (cryo-EM) to define the mechanism that underlies this process by characterizing the transposition regulator, TnsC, from a type V-K CRISPR-transposase system. In this scenario, polymerization of adenosine triphosphate-bound TnsC helical filaments could explain how polarity information is passed to the transposase. TniQ caps the TnsC filament, representing a universal mechanism for target information transfer in Tn7/Tn7-like elements. Transposase-driven disassembly establishes delivery of the element only to unused protospacers. Finally, TnsC transitions to define the fixed point of insertion, as revealed by structures with the transition state mimic ADP*AlF(3) These mechanistic findings provide the underpinnings for engineering CRISPR-associated transposition systems for research and therapeutic applications. Structural basis for target site selection in RNA-guided DNA transposition systems.,Park JU, Tsai AW, Mehrotra E, Petassi MT, Hsieh SC, Ke A, Peters JE, Kellogg EH Science. 2021 Aug 13;373(6556):768-774. doi: 10.1126/science.abi8976. Epub 2021 , Jul 15. PMID:34385391 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Transposase 3D structures

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