7YHS

Structure of Csy-AcrIF4-dsDNA


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.37 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


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Literature

Anti-CRISPR protein AcrIF4 inhibits the type I-F CRISPR-Cas surveillance complex by blocking nuclease recruitment and DNA cleavage.

Gao, Z.Zhang, L.Ge, Z.Wang, H.Yue, Y.Jiang, Z.Wang, X.Xu, C.Zhang, Y.Yang, M.Feng, Y.

(2022) J Biol Chem 298: 102575-102575

  • DOI: https://doi.org/10.1016/j.jbc.2022.102575
  • Primary Citation of Related Structures:  
    7YHS

  • PubMed Abstract: 

    The clustered regularly interspaced short palindromic repeats (CRISPR)-Cas system provides prokaryotes with protection against mobile genetic elements such as phages. In turn, phages deploy anti-CRISPR (Acr) proteins to evade this immunity. AcrIF4, an Acr targeting the type I-F CRISPR-Cas system, has been reported to bind the crRNA-guided surveillance (Csy) complex. However, it remains controversial whether AcrIF4 inhibits target DNA binding to the Csy complex. Here, we present structural and mechanistic studies into AcrIF4, exploring its unique anti-CRISPR mechanism. While the Csy-AcrIF4 complex displays decreased affinity for target DNA, it is still able to bind the DNA. Our structural and functional analyses of the Csy-AcrIF4-dsDNA complex revealed that AcrIF4 binding prevents rotation of the helical bundle of the Cas8f subunit induced by dsDNA binding, therefore resulting in failure of nuclease Cas2/3 recruitment and DNA cleavage. Overall, our study provides an interesting example of attack on the nuclease recruitment event by an Acr, but not conventional mechanisms of blocking binding of target DNA.


  • Organizational Affiliation

    Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing Key Laboratory of Bioprocess, State Key Laboratory of Chemical Resource Engineering, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing, China.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Type I-F CRISPR-associated protein Csy1434Pseudomonas aeruginosaMutation(s): 0 
Gene Names: csy1
UniProt
Find proteins for A0A3A8DDU9 (Pseudomonas aeruginosa)
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Go to UniProtKB:  A0A3A8DDU9
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UniProt GroupA0A3A8DDU9
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
CRISPR-associated protein Csy3342Pseudomonas aeruginosaMutation(s): 0 
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
CRISPR type I-F/YPEST-associated protein Csy2D [auth E]327Pseudomonas aeruginosaMutation(s): 0 
Gene Names: csy2
UniProt
Find proteins for B3G161 (Pseudomonas aeruginosa)
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UniProt GroupB3G161
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
AcrIF4I [auth J]100Pseudomonas aeruginosaMutation(s): 0 
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Csy4J [auth L]187Pseudomonas aeruginosaMutation(s): 0 
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Entity ID: 6
MoleculeChains LengthOrganismImage
RNA (58-MER)K [auth M]60Pseudomonas aeruginosa
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Entity ID: 7
MoleculeChains LengthOrganismImage
DNA (39-MER)L [auth N]54Pseudomonas aeruginosa
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Entity ID: 8
MoleculeChains LengthOrganismImage
DNA (5'-D(P*AP*GP*CP*AP*GP*CP*TP*GP*CP*AP*CP*C)-3')M [auth O]54Pseudomonas aeruginosa
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.37 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Science Foundation (NSF, China)China32171274

Revision History  (Full details and data files)

  • Version 1.0: 2023-03-29
    Type: Initial release