5XLO

Anti-CRISPR proteins AcrF1/2 bound to Csy surveillance complex with a 32nt spacer crRNA backbone region


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Alternate binding modes of anti-CRISPR viral suppressors AcrF1/2 to Csy surveillance complex revealed by cryo-EM structures.

Peng, R.Xu, Y.Zhu, T.Li, N.Qi, J.Chai, Y.Wu, M.Zhang, X.Shi, Y.Wang, P.Wang, J.Gao, N.Gao, G.F.

(2017) Cell Res 27: 853-864

  • DOI: https://doi.org/10.1038/cr.2017.79
  • Primary Citation of Related Structures:  
    5XLO, 5XLP

  • PubMed Abstract: 

    Bacteriophages encode anti-CRISPR suppressors to counteract the CRISPR/Cas immunity of their bacterial hosts, thus facilitating their survival and replication. Previous studies have shown that two phage-encoded anti-CRISPR proteins, AcrF1 and AcrF2, suppress the type I-F CRISPR/Cas system of Pseudomonas aeruginosa by preventing target DNA recognition by the Csy surveillance complex, but the precise underlying mechanism was unknown. Here we present the structure of AcrF1/2 bound to the Csy complex determined by cryo-EM single-particle reconstruction. By structural analysis, we found that AcrF1 inhibits target DNA recognition of the Csy complex by interfering with base pairing between the DNA target strand and crRNA spacer. In addition, multiple copies of AcrF1 bind to the Csy complex with different modes when working individually or cooperating with AcrF2, which might exclude target DNA binding through different mechanisms. Together with previous reports, we provide a comprehensive working scenario for the two anti-CRISPR suppressors, AcrF1 and AcrF2, which silence CRISPR/Cas immunity by targeting the Csy surveillance complex.


  • Organizational Affiliation

    CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China.


Macromolecules

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CRISPR-associated protein Csy3
A, B, C, D, E
A, B, C, D, E, F
342Pseudomonas aeruginosa UCBPP-PA14Mutation(s): 0 
Gene Names: csy3csy1-3PA14_33310
UniProt
Find proteins for Q02MM1 (Pseudomonas aeruginosa (strain UCBPP-PA14))
Explore Q02MM1 
Go to UniProtKB:  Q02MM1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ02MM1
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Uncharacterized protein AcrF1H [auth N],
I [auth M]
78Pseudomonas phage JBD30Mutation(s): 0 
Gene Names: JBD30_035
UniProt
Find proteins for L7P7M1 (Pseudomonas phage JBD30)
Explore L7P7M1 
Go to UniProtKB:  L7P7M1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupL7P7M1
Sequence Annotations
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  • Reference Sequence
Find similar nucleic acids by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains LengthOrganismImage
crRNA with 32nt spacer sequenceG [auth K]60Pseudomonas aeruginosa
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION2.0
MODEL REFINEMENTPHENIX1.11

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
China Ministry of Science and Technology National 973 ProjectChina2013CB531502

Revision History  (Full details and data files)

  • Version 1.0: 2018-01-10
    Type: Initial release
  • Version 1.1: 2024-03-27
    Changes: Data collection, Database references