6muu | pdb_00006muu

Cryo-EM structure of Csm-crRNA binary complex in type III-A CRISPR-Cas system

Loading... Status: waiting for Mol* initialization Structural highlights 6muu is a 7 chain structure with sequence from "thermococcus_onnurineus"_bae_et_al._2006 "thermococcus onnurineus" bae et al. 2006. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ZN Related: 6mur, 6mus, 6mut, 6mua Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Type IotaIotaIota CRISPR-Cas systems provide robust immunity against foreign RNA and DNA by sequence-specific RNase and target RNA-activated sequence-nonspecific DNase and RNase activities. We report on cryo-EM structures of Thermococcus onnurineus Csm(crRNA) binary, Csm(crRNA)-target RNA and Csm(crRNA)-target RNA(anti-tag) ternary complexes in the 3.1 A range. The topological features of the crRNA 5'-repeat tag explains the 5'-ruler mechanism for defining target cleavage sites, with accessibility of positions -2 to -5 within the 5'-repeat serving as sensors for avoidance of autoimmunity. The Csm3 thumb elements introduce periodic kinks in the crRNA-target RNA duplex, facilitating cleavage of the target RNA with 6-nt periodicity. Key Glu residues within a Csm1 loop segment of Csm(crRNA) adopt a proposed autoinhibitory conformation suggestive of DNase activity regulation. These structural findings, complemented by mutational studies of key intermolecular contacts, provide insights into Csm(crRNA) complex assembly, mechanisms underlying RNA targeting and site-specific periodic cleavage, regulation of DNase cleavage activity, and autoimmunity suppression. Type III-A CRISPR-Cas Csm Complexes: Assembly, Periodic RNA Cleavage, DNase Activity Regulation, and Autoimmunity.,Jia N, Mo CY, Wang C, Eng ET, Marraffini LA, Patel DJ Mol Cell. 2018 Nov 27. pii: S1097-2765(18)30977-8. doi:, 10.1016/j.molcel.2018.11.007. PMID:30503773 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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