5B7I image
Deposition Date 2016-06-07
Release Date 2016-07-06
Last Version Date 2024-10-23
Entry Detail
PDB ID:
5B7I
Keywords:
HYDROLASE/UNKNOWN FUNCTION
Title:
Cas3-AcrF3 complex
Biological Source:
Source Organism:
Pseudomonas aeruginosa (strain UCBPP-PA14) (Taxon ID: 208963)
Pseudomonas phage JBD5 (Taxon ID: 1223261)
Host Organism:
Escherichia coli
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.60 Å
R-Value Free:
0.24
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
C 2 2 21
5B7I validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:CRISPR-associated nuclease/helicase Cas3 subtype I-F/YPEST
Gene (Uniprot):cas3
Chain IDs:A
Chain Length:1082
Number of Molecules:1
Biological Source:Pseudomonas aeruginosa (strain UCBPP-PA14)
UniProt ID:Q02ML8 Pfam ID:PF21384, PF18019, PF22590, PF21802
Protein Blast
Polymer Type:polypeptide(L)
Molecule:Uncharacterized protein AcrF3
Gene (Uniprot):JBD5_035
Chain IDs:B, C
Chain Length:153
Number of Molecules:2
Biological Source:Pseudomonas phage JBD5
UniProt ID:L7P7R7 Pfam ID:PF21401
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET modified residue
Ligand Molecules
ADP
CA
Primary Citation
Structural basis of Cas3 inhibition by the bacteriophage protein AcrF3
Nat.Struct.Mol.Biol. 23 868 870 (2016)
PMID: 27455460 DOI: 10.1038/nsmb.3269

Abstact

Bacteriophages express proteins that inactivate the CRISPR-Cas bacterial immune system. Here we report the crystal structure of the anti-CRISPR protein AcrF3 in complex with Pseudomonas aeruginosa Cas3 (PaCas3). AcrF3 forms a homodimer that locks PaCas3 in an ADP-bound form, blocks the entrance of the DNA-binding tunnel in the helicase domain, and masks the linker region and C-terminal domain of PaCas3, thereby preventing recruitment by Cascade and inhibiting the type I-F CRISPR-Cas system.

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Primary Citation of related structures
5B7I