2Y8W image
Deposition Date 2011-02-11
Release Date 2011-05-18
Last Version Date 2024-01-31
Entry Detail
PDB ID:
2Y8W
Keywords:
Title:
Structure of CRISPR endoribonuclease Cse3 bound to 20 nt RNA
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.80 Å
R-Value Free:
0.21
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:CSE3
Gene (Uniprot):cse3
Chain IDs:A
Chain Length:215
Number of Molecules:1
Biological Source:THERMUS THERMOPHILUS
Primary Citation
An RNA-Induced Conformational Change Required for Crispr RNA Cleavage by the Endoribonuclease Cse3.
Nat.Struct.Mol.Biol. 18 680 ? (2011)
PMID: 21572442 DOI: 10.1038/NSMB.2043

Abstact

Clustered regularly interspaced short palindromic repeat (CRISPR) chromosomal loci found in prokaryotes provide an adaptive immune system against bacteriophages and plasmids. CRISPR-specific endoRNases produce short RNA molecules (crRNAs) from CRISPR transcripts, which harbor sequences complementary to invasive nucleic acid elements and ensure their selective targeting by CRISPR-associated (Cas) proteins. The extreme sequence divergence of CRISPR-specific endoRNases and their RNA substrates has obscured homology-based comparison of RNA recognition and cleavage mechanisms. Here, we show that Cse3 type CRISPR-specific endoRNases bind a hairpin structure and residues downstream of the cleavage site within the repetitive segment of cognate CRISPR RNA. Cocrystal structures of Cse3-RNA complexes reveal an RNA-induced conformational change in the enzyme active site that aligns the RNA strand for site-specific cleavage. These studies provide insight into a catalytically essential RNA recognition mechanism by a large class of CRISPR-related endoRNases.

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