5CD4
The Type IE CRISPR Cascade complex from E. coli, with two assemblies in the asymmetric unit arranged back-to-back
Summary for 5CD4
| Entry DOI | 10.2210/pdb5cd4/pdb |
| Descriptor | CRISPR system Cascade subunit CasE, CRISPR system Cascade subunit CasC, CRISPR system Cascade subunit CasD, ... (7 entities in total) |
| Functional Keywords | crispr, cascade, rna surveillance, adaptive immunity, hydrolase-rna complex, hydrolase/rna |
| Biological source | Escherichia coli More |
| Total number of polymer chains | 24 |
| Total formula weight | 804324.65 |
| Authors | Jackson, R.N.,Golden, S.M.,Carter, J.,Wiedenheft, B. (deposition date: 2015-07-03, release date: 2015-08-26, Last modification date: 2024-12-25) |
| Primary citation | van Erp, P.B.,Jackson, R.N.,Carter, J.,Golden, S.M.,Bailey, S.,Wiedenheft, B. Mechanism of CRISPR-RNA guided recognition of DNA targets in Escherichia coli. Nucleic Acids Res., 43:8381-8391, 2015 Cited by PubMed Abstract: In bacteria and archaea, short fragments of foreign DNA are integrated into Clustered Regularly Interspaced Short Palindromic Repeat (CRISPR) loci, providing a molecular memory of previous encounters with foreign genetic elements. In Escherichia coli, short CRISPR-derived RNAs are incorporated into a multi-subunit surveillance complex called Cascade (CRISPR-associated complex for antiviral defense). Recent structures of Cascade capture snapshots of this seahorse-shaped RNA-guided surveillance complex before and after binding to a DNA target. Here we determine a 3.2 Å x-ray crystal structure of Cascade in a new crystal form that provides insight into the mechanism of double-stranded DNA binding. Molecular dynamic simulations performed using available structures reveal functional roles for residues in the tail, backbone and belly subunits of Cascade that are critical for binding double-stranded DNA. Structural comparisons are used to make functional predictions and these predictions are tested in vivo and in vitro. Collectively, the results in this study reveal underlying mechanisms involved in target-induced conformational changes and highlight residues important in DNA binding and protospacer adjacent motif recognition. PubMed: 26243775DOI: 10.1093/nar/gkv793 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (3.2 Å) |
Structure validation
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