6W1X

Cryo-EM structure of anti-CRISPR AcrIF9, bound to the type I-F crRNA-guided CRISPR surveillance complex

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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This is version 1.1 of the entry. See complete history. 


Literature

AcrIF9 tethers non-sequence specific dsDNA to the CRISPR RNA-guided surveillance complex.

Hirschi, M., Lu, W.T., Santiago-Frangos, A., Wilkinson, R., Golden, S.M., Davidson, A.R., Lander, G.C., Wiedenheft, B.

(2020) Nat Commun 11: 2730-2730

  • DOI: https://doi.org/10.1038/s41467-020-16512-1
  • Primary Citation of Related Structures:  
    6W1X, 6WHI

  • PubMed Abstract: 

    • Bacteria have evolved sophisticated adaptive immune systems, called CRISPR-Cas, that provide sequence-specific protection against phage infection. In turn, phages have evolved a broad spectrum of anti-CRISPRs that suppress these immune systems. Here we report structures of anti-CRISPR protein IF9 (AcrIF9) in complex with the type I-F CRISPR RNA-guided surveillance complex (Csy) ...

    Bacteria have evolved sophisticated adaptive immune systems, called CRISPR-Cas, that provide sequence-specific protection against phage infection. In turn, phages have evolved a broad spectrum of anti-CRISPRs that suppress these immune systems. Here we report structures of anti-CRISPR protein IF9 (AcrIF9) in complex with the type I-F CRISPR RNA-guided surveillance complex (Csy). In addition to sterically blocking the hybridization of complementary dsDNA to the CRISPR RNA, our results show that AcrIF9 binding also promotes non-sequence-specific engagement with dsDNA, potentially sequestering the complex from target DNA. These findings highlight the versatility of anti-CRISPR mechanisms utilized by phages to suppress CRISPR-mediated immune systems.

    Organizational Affiliation: 

    Department of Microbiology and Immunology, Montana State University, 1156 South 11th Avenue, Bozeman, MT, 59717, USA. bwiedenheft@gmail.com.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CRISPR-associated protein Csy1A434Pseudomonas aeruginosaMutation(s): 0 
Gene Names: csy1, PA14_33330
UniProt
Find proteins for Q02ML9 (Pseudomonas aeruginosa (strain UCBPP-PA14))
Explore Q02ML9 
Go to UniProtKB:  Q02ML9
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UniProt GroupQ02ML9
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Type I-F CRISPR-associated protein Csy2B327Pseudomonas aeruginosaMutation(s): 0 
Gene Names: csy2, ALP65_00953, EQH76_13810, FCG96_17775, PACL_0128
UniProt
Find proteins for Q02MM0 (Pseudomonas aeruginosa (strain UCBPP-PA14))
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UniProt GroupQ02MM0
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
CRISPR-associated protein Csy3
C, D, E, F, G, H
C, D, E, F, G, H
360Pseudomonas aeruginosaMutation(s): 0 
Gene Names: EQH76_13805, FCG96_17770
UniProt
Find proteins for Q02MM1 (Pseudomonas aeruginosa (strain UCBPP-PA14))
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UniProt GroupQ02MM1
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
CRISPR-associated endonuclease Cas6/Csy4J [auth L]187Pseudomonas aeruginosaMutation(s): 0 
Gene Names: cas6f, csy4, PA14_33300
EC: 3.1
UniProt
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
anti-CRISPR AcrIF9K [auth I],
L [auth J]		68Proteus penneriMutation(s): 0 
UniProt
Find proteins for C0AVY5 (Proteus penneri ATCC 35198)
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UniProt GroupC0AVY5
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Entity ID: 4
MoleculeChainsLengthOrganismImage
RNA (60-MER)I [auth M]60Pseudomonas aeruginosa
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/Office of the DirectorUnited StatesDP2EB020402
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR35GM134867
National Institutes of Health/Office of the DirectorUnited StatesS10OD021634

Revision History  (Full details and data files)

  • Version 1.0: 2020-05-13
    Type: Initial release
  • Version 1.1: 2020-06-17
    Changes: Database references