Anti-CRISPR AcrIIa6 cubic form

Experimental Data Snapshot

  • Resolution: 2.50 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.232 

wwPDB Validation   3D Report Full Report

This is version 1.2 of the entry. See complete history


Widespread anti-CRISPR proteins in virulent bacteriophages inhibit a range of Cas9 proteins.

Hynes, A.P.Rousseau, G.M.Agudelo, D.Goulet, A.Amigues, B.Loehr, J.Romero, D.A.Fremaux, C.Horvath, P.Doyon, Y.Cambillau, C.Moineau, S.

(2018) Nat Commun 9: 2919-2919

  • DOI: https://doi.org/10.1038/s41467-018-05092-w
  • Primary Citation of Related Structures:  
    6EYX, 6EYY

  • PubMed Abstract: 

    CRISPR-Cas systems are bacterial anti-viral systems, and bacterial viruses (bacteriophages, phages) can carry anti-CRISPR (Acr) proteins to evade that immunity. Acrs can also fine-tune the activity of CRISPR-based genome-editing tools. While Acrs are prevalent in phages capable of lying dormant in a CRISPR-carrying host, their orthologs have been observed only infrequently in virulent phages. Here we identify AcrIIA6, an Acr encoded in 33% of virulent Streptococcus thermophilus phage genomes. The X-ray structure of AcrIIA6 displays some features unique to this Acr family. We compare the activity of AcrIIA6 to those of other Acrs, including AcrIIA5 (also from S. thermophilus phages), and characterize their effectiveness against a range of CRISPR-Cas systems. Finally, we demonstrate that both Acr families from S. thermophilus phages inhibit Cas9-mediated genome editing of human cells.

  • Organizational Affiliation

    Département de biochimie, de microbiologie, et de bioinformatique, Faculté des sciences et de génie, Groupe de recherche en écologie buccale, Faculté de médecine dentaire, Université Laval, Québec City, QC, G1V 0A6, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
183Streptococcus phage 73Mutation(s): 0 
Find proteins for A0A1S5PRR0 (Streptococcus phage 73)
Explore A0A1S5PRR0 
Go to UniProtKB:  A0A1S5PRR0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A1S5PRR0
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.50 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.232 
  • R-Value Observed: 0.232 
  • Space Group: P 43 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 175.27α = 90
b = 175.27β = 90
c = 175.27γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-06-06
    Type: Initial release
  • Version 1.1: 2018-08-08
    Changes: Data collection, Database references
  • Version 1.2: 2019-08-14
    Changes: Data collection