7y9y

Structure of the Cas7-11-Csx29-guide RNA-target RNA (no PFS) complex

spinqualitylabelsall models 7y9y, resolution 2.77Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7y9y is a 4 chain structure with sequence from Desulfonema ishimotonii. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 2.77Å Ligands: ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A401FT52_9BACT Publication Abstract from PubMed The type III-E CRISPR-Cas7-11 effector binds a CRISPR RNA (crRNA) and the putative protease Csx29 and catalyzes crRNA-guided RNA cleavage. We report cryo-electron microscopy structures of the Cas7-11-crRNA-Csx29 complex with and without target RNA (tgRNA), and demonstrate that tgRNA binding induces conformational changes in Csx29. Biochemical experiments revealed tgRNA-dependent cleavage of the accessory protein Csx30 by Csx29. Reconstitution of the system in bacteria showed that Csx30 cleavage yields toxic protein fragments that cause growth arrest, which is regulated by Csx31. Csx30 binds Csx31 and the associated sigma factor RpoE (RNA polymerase, extracytoplasmic E), suggesting that Csx30-mediated RpoE inhibition modulates the cellular response to infection. We engineered the Cas7-11-Csx29-Csx30 system for programmable RNA sensing in mammalian cells. Overall, the Cas7-11-Csx29 effector is an RNA-dependent nuclease-protease. RNA-triggered protein cleavage and cell growth arrest by the type III-E CRISPR nuclease-protease.,Kato K, Okazaki S, Schmitt-Ulms C, Jiang K, Zhou W, Ishikawa J, Isayama Y, Adachi S, Nishizawa T, Makarova KS, Koonin EV, Abudayyeh OO, Gootenberg JS, Nishimasu H Science. 2022 Nov 25;378(6622):882-889. doi: 10.1126/science.add7347. Epub 2022 , Nov 3. PMID:36423304 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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