7JZX

Cryo-EM structure of CRISPR-Cas surveillance complex with AcrIF7


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.40 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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This is version 1.3 of the entry. See complete history


Literature

Structural basis for inhibition of the type I-F CRISPR-Cas surveillance complex by AcrIF4, AcrIF7 and AcrIF14.

Gabel, C.Li, Z.Zhang, H.Chang, L.

(2021) Nucleic Acids Res 49: 584-594

  • DOI: https://doi.org/10.1093/nar/gkaa1199
  • Primary Citation of Related Structures:  
    7JZW, 7JZX, 7JZZ

  • PubMed Abstract: 

    CRISPR-Cas systems are adaptive immune systems in bacteria and archaea to defend against mobile genetic elements (MGEs) and have been repurposed as genome editing tools. Anti-CRISPR (Acr) proteins are produced by MGEs to counteract CRISPR-Cas systems and can be used to regulate genome editing by CRISPR techniques. Here, we report the cryo-EM structures of three type I-F Acr proteins, AcrIF4, AcrIF7 and AcrIF14, bound to the type I-F CRISPR-Cas surveillance complex (the Csy complex) from Pseudomonas aeruginosa. AcrIF4 binds to an unprecedented site on the C-terminal helical bundle of Cas8f subunit, precluding conformational changes required for activation of the Csy complex. AcrIF7 mimics the PAM duplex of target DNA and is bound to the N-terminal DNA vise of Cas8f. Two copies of AcrIF14 bind to the thumb domains of Cas7.4f and Cas7.6f, preventing hybridization between target DNA and the crRNA. Our results reveal structural detail of three AcrIF proteins, each binding to a different site on the Csy complex for inhibiting degradation of MGEs.


  • Organizational Affiliation

    Department of Biological Sciences, Purdue University, 915 W. State Street, West Lafayette, IN 47907, USA.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CRISPR-associated endonuclease Cas6/Csy4A [auth C]187Pseudomonas aeruginosaMutation(s): 0 
Gene Names: cas6fcsy4PA14_33300
EC: 3.1
UniProt
Find proteins for Q02MM2 (Pseudomonas aeruginosa (strain UCBPP-PA14))
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Go to UniProtKB:  Q02MM2
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UniProt GroupQ02MM2
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Type I-F CRISPR-associated protein Csy2327Pseudomonas aeruginosaMutation(s): 0 
Gene Names: csy2ALP65_00953EQH76_13810FCG96_17775PACL_0128
UniProt
Find proteins for Q02MM0 (Pseudomonas aeruginosa (strain UCBPP-PA14))
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UniProt GroupQ02MM0
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
CRISPR type I-F/YPEST-associated protein Csy3342Pseudomonas aeruginosaMutation(s): 0 
Gene Names: EQH76_13805F7O93_18150NCTC13437_01527NCTC13619_03982
UniProt
Find proteins for Q02MM1 (Pseudomonas aeruginosa (strain UCBPP-PA14))
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UniProt GroupQ02MM1
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
CRISPR-associated protein Csy1I [auth A]434Pseudomonas aeruginosaMutation(s): 0 
Gene Names: csy1PA14_33330
UniProt
Find proteins for Q02ML9 (Pseudomonas aeruginosa (strain UCBPP-PA14))
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
AcrF7K [auth J]83Pseudomonas aeruginosaMutation(s): 0 
Gene Names: PACL_0680
UniProt
Find proteins for B3G1L5 (Pseudomonas aeruginosa)
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UniProt GroupB3G1L5
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Entity ID: 5
MoleculeChains LengthOrganismImage
RNA (61-MER)J [auth M]61Pseudomonas aeruginosa
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.40 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-12-30
    Type: Initial release
  • Version 1.1: 2021-06-02
    Changes: Structure summary
  • Version 1.2: 2022-01-12
    Changes: Database references
  • Version 1.3: 2024-05-29
    Changes: Data collection