ISDA

Entry Detail

PDB ID:

5UZ9

EMDB ID:

EMD-8624

Keywords:

IMMUNE SYSTEM/RNA

Title:

Cryo EM structure of anti-CRISPRs, AcrF1 and AcrF2, bound to type I-F crRNA-guided CRISPR surveillance complex

Biological Source:

Source Organism:

Pseudomonas aeruginosa (strain UCBPP-PA14), Pseudomonas phage JBD30, Pseudomonas phage D3112

Host Organism:

Escherichia coli BL21(DE3)

PDB Version:

Deposition Date:

2017-02-25

Release Date:

2017-04-26

Method Details:

Experimental Method:

ELECTRON MICROSCOPY

Resolution:

3.40 Å

Aggregation State:

PARTICLE

Reconstruction Method:

SINGLE PARTICLE

Download Validation Report

Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:CRISPR-associated protein Csy1
Chain IDs:A
Chain Length:434
Number of Molecules:1
Biological Source:Pseudomonas aeruginosa (strain UCBPP-PA14)

UniProt ID:Q02ML9 Pfam ID:PF09611

Protein Blast

Polymer Type:polypeptide(L)
Description:CRISPR-associated protein Csy2
Chain IDs:B
Chain Length:327
Number of Molecules:1
Biological Source:Pseudomonas aeruginosa (strain UCBPP-PA14)

UniProt ID:Q02MM0 Pfam ID:PF09614

Protein Blast

Polymer Type:polypeptide(L)
Description:CRISPR-associated protein Csy3
Chain IDs:C, D, E, F, G, H
Chain Length:341
Number of Molecules:6
Biological Source:Pseudomonas aeruginosa (strain UCBPP-PA14)

UniProt ID:Q02MM1 Pfam ID:PF09615

Protein Blast

Polymer Type:polypeptide(L)
Description:Anti-CRISPR protein Acr30-35
Chain IDs:I, J
Chain Length:77
Number of Molecules:2
Biological Source:Pseudomonas phage JBD30

UniProt ID:L7P7M1 Pfam ID:PF20829

Protein Blast

Polymer Type:polypeptide(L)
Description:Anti-CRISPR protein 30
Chain IDs:K
Chain Length:96
Number of Molecules:1
Biological Source:Pseudomonas phage D3112

UniProt ID:Q6TM72

Protein Blast

Polymer Type:polypeptide(L)
Description:CRISPR-associated endonuclease Cas6/Csy4
Chain IDs:L
Chain Length:189
Number of Molecules:1
Biological Source:Pseudomonas aeruginosa (strain UCBPP-PA14)

UniProt ID:Q02MM2 Pfam ID:PF09618

Polymer Type:polyribonucleotide
Description:CRISPR RNA (60-MER)
Chain IDs:M
Chain Length:60
Number of Molecules:1
Biological Source:Pseudomonas aeruginosa UCBPP-PA14

Ligand Molecules

Primary Citation

Structure Reveals Mechanisms of Viral Suppressors that Intercept a CRISPR RNA-Guided Surveillance Complex.

Chowdhury, S, Carter, J, Rollins, M.F, Golden, S.M, Jackson, R.N, Hoffmann, C, Nosaka, L, Bondy-Denomy, J, Maxwell, K.L, Davidson, A.R, Fischer, E.R, Lander, G.C, Wiedenheft, B.Show

Cell 169 47 57.e11 (2017)

PMID: 28340349 DOI: 10.1016/j.cell.2017.03.012

Abstact

Genetic conflict between viruses and their hosts drives evolution and genetic innovation. Prokaryotes evolved CRISPR-mediated adaptive immune systems for protection from viral infection, and viruses have evolved diverse anti-CRISPR (Acr) proteins that subvert these immune systems. The adaptive immune system in Pseudomonas aeruginosa (type I-F) relies on a 350 kDa CRISPR RNA (crRNA)-guided surveillance complex (Csy complex) to bind foreign DNA and recruit a trans-acting nuclease for target degradation. Here, we report the cryo-electron microscopy (cryo-EM) structure of the Csy complex bound to two different Acr proteins, AcrF1 and AcrF2, at an average resolution of 3.4 Å. The structure explains the molecular mechanism for immune system suppression, and structure-guided mutations show that the Acr proteins bind to residues essential for crRNA-mediated detection of DNA. Collectively, these data provide a snapshot of an ongoing molecular arms race between viral suppressors and the immune system they target.

Legend

Protein

Chemical

Disease

Primary Citation of related structures