9KJB image
Entry Detail
PDB ID:
9KJB
Keywords:
IMMUNE SYSTEM
Title:
Crystal structure of Anti-CRISPR AcrIE7
Biological Source:
Source Organism:
Pseudomonas aeruginosa
Host Organism:
Escherichia coli BL21(DE3)
PDB Version:
Deposition Date:
2024-11-12
Release Date:
2025-04-16
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.11 Å
R-Value Free:
0.23
R-Value Work:
0.18
R-Value Observed:
0.19
Space Group:
P 63
9KJB validation report
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:AcrIE7
Chain IDs:A
Chain Length:114
Number of Molecules:1
Biological Source:Pseudomonas aeruginosa
Primary Citation
AcrIE7 inhibits the CRISPR-Cas system by directly binding to the R-loop single-stranded DNA.
Proc.Natl.Acad.Sci.USA 122 e2423205122 e2423205122 (2025)
PMID: 40178896 DOI: 10.1073/pnas.2423205122

Abstact

The CRISPR-Cas system is a well-known adaptive immune system in bacteria, and a prominent mechanism for evading this immunity involves anti-CRISPR (Acr) proteins, which employ various methods to neutralize the CRISPR-Cas system. In this study, using structural and biochemical analyses, we revealed that AcrIE7 binds to the single-stranded DNA in the R-loop formed when Cascade encounters the target DNA, thereby preventing Cas3 from cleaving the DNA. This represents a different inhibition strategy distinct from previously reported Acr mechanisms and offers insights into CRISPR-Cas inhibition.

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Primary Citation of related structures
9KJB