7TAW image
Entry Detail
PDB ID:
7TAW
EMDB ID:
EMD-25788
Keywords:
HYDROLASE/RNA/DNA
Title:
Cryo-EM structure of the Csy-AcrIF24-promoter DNA dimer
Biological Source:
Source Organism:
Pseudomonas
Host Organism:
Escherichia
PDB Version:
Deposition Date:
2021-12-21
Release Date:
2022-09-21
Method Details:
Experimental Method:
ELECTRON MICROSCOPY
Resolution:
2.70 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
7TAW validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:CRISPR-associated protein Csy1
Chain IDs:A, M (auth: a)
Chain Length:434
Number of Molecules:2
Biological Source:Pseudomonas
UniProt ID:Q02ML9 Pfam ID:PF09611
Protein Blast
Polymer Type:polypeptide(L)
Description:CRISPR type I-F/YPEST-associated protein Csy2
Chain IDs:B, N (auth: b)
Chain Length:327
Number of Molecules:2
Biological Source:Pseudomonas
UniProt ID:Q02MM0 Pfam ID:PF09614
Protein Blast
Polymer Type:polypeptide(L)
Description:CRISPR-associated endonuclease Cas6/Csy4
Chain IDs:C, O (auth: c)
Chain Length:187
Number of Molecules:2
Biological Source:Pseudomonas
UniProt ID:Q02MM2 Pfam ID:PF09618
Protein Blast
Polymer Type:polypeptide(L)
Description:CRISPR type I-F/YPEST-associated protein Csy3
Chain IDs:D, E, F, G, H, I, P (auth: d), Q (auth: e), R (auth: f), S (auth: g), T (auth: h), U (auth: i)
Chain Length:360
Number of Molecules:12
Biological Source:Pseudomonas
UniProt ID:Q02MM1 Pfam ID:PF09615
Polymer Type:polypeptide(L)
Description:AcrIF24
Chain IDs:J, K
Chain Length:228
Number of Molecules:2
Biological Source:Pseudomonas
Polymer Type:polyribonucleotide
Description:RNA (61-MER)
Chain IDs:L (auth: M), V (auth: m)
Chain Length:61
Number of Molecules:2
Biological Source:Pseudomonas
Polymer Type:polydeoxyribonucleotide
Description:DNA (5'-D(P*TP*TP*AP*GP*CP*TP*CP*GP*AP*AP*TP*CP*GP*AP*GP*CP*TP*AP*T)-3')
Chain IDs:X
Chain Length:19
Number of Molecules:1
Biological Source:Pseudomonas
Polymer Type:polydeoxyribonucleotide
Description:DNA (5'-D(P*AP*TP*AP*GP*CP*TP*CP*GP*AP*TP*TP*CP*GP*AP*GP*CP*TP*AP*A)-3')
Chain IDs:W (auth: Y)
Chain Length:19
Number of Molecules:1
Biological Source:Pseudomonas
Ligand Molecules
NA
Primary Citation
Structural basis of AcrIF24 as an anti-CRISPR protein and transcriptional suppressor.
Nat.Chem.Biol. 18 1417 1424 (2022)
PMID: 36163386 DOI: 10.1038/s41589-022-01137-w

Abstact

Anti-CRISPR (Acr) proteins are encoded by phages to inactivate CRISPR-Cas systems of bacteria and archaea and are used to enhance the CRISPR toolbox for genome editing. Here we report the structure and mechanism of AcrIF24, an Acr protein that inhibits the type I-F CRISPR-Cas system from Pseudomonas aeruginosa. AcrIF24 is a homodimer that associates with two copies of the surveillance complex (Csy) and prevents the hybridization between CRISPR RNA and target DNA. Furthermore, AcrIF24 functions as an anti-CRISPR-associated (Aca) protein to repress the transcription of the acrIF23-acrIF24 operon. Alone or in complex with Csy, AcrIF24 is capable of binding to the acrIF23-acrIF24 promoter DNA with nanomolar affinity. The structure of a Csy-AcrIF24-promoter DNA complex at 2.7 Å reveals the mechanism for transcriptional suppression. Our results reveal that AcrIF24 functions as an Acr-Aca fusion protein, and they extend understanding of the diverse mechanisms used by Acr proteins.

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7TAW