Crystal structure of anti-CRISPR protein AcrIIC2 dimer

Experimental Data Snapshot

  • Resolution: 2.45 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.194 

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Inhibition of CRISPR-Cas9 ribonucleoprotein complex assembly by anti-CRISPR AcrIIC2.

Thavalingam, A.Cheng, Z.Garcia, B.Huang, X.Shah, M.Sun, W.Wang, M.Harrington, L.Hwang, S.Hidalgo-Reyes, Y.Sontheimer, E.J.Doudna, J.Davidson, A.R.Moraes, T.F.Wang, Y.Maxwell, K.L.

(2019) Nat Commun 10: 2806-2806

  • DOI: https://doi.org/10.1038/s41467-019-10577-3
  • Primary Citation of Related Structures:  
    6JD7, 6JDJ, 6JDX, 6N05

  • PubMed Abstract: 

    CRISPR-Cas adaptive immune systems function to protect bacteria from invasion by foreign genetic elements. The CRISPR-Cas9 system has been widely adopted as a powerful genome-editing tool, and phage-encoded inhibitors, known as anti-CRISPRs, offer a means of regulating its activity. Here, we report the crystal structures of anti-CRISPR protein AcrIIC2 Nme alone and in complex with Nme1Cas9. We demonstrate that AcrIIC2 Nme inhibits Cas9 through interactions with the positively charged bridge helix, thereby preventing sgRNA loading. In vivo phage plaque assays and in vitro DNA cleavage assays show that AcrIIC2 Nme mediates its activity through a large electronegative surface. This work shows that anti-CRISPR activity can be mediated through the inhibition of Cas9 complex assembly.

  • Organizational Affiliation

    Department of Chemistry, University of California, Berkeley, CA, 94720, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C
124Neisseria meningitidis 8013Mutation(s): 0 
Gene Names: CIJ84_02100
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Resolution: 2.45 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.194 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.559α = 90
b = 73.532β = 129.8
c = 81.087γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Natural Science Foundation of ChinaChina31725008

Revision History  (Full details and data files)

  • Version 1.0: 2019-05-15
    Type: Initial release
  • Version 1.1: 2019-07-31
    Changes: Data collection, Database references
  • Version 1.2: 2020-12-30
    Changes: Derived calculations, Structure summary