5XN4

Anti-CRISPR protein AcrIIA4


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 1000 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report



Literature

Solution structure and dynamics of anti-CRISPR AcrIIA4, the Cas9 inhibitor.

Kim, I.Jeong, M.Ka, D.Han, M.Kim, N.K.Bae, E.Suh, J.Y.

(2018) Sci Rep 8: 3883-3883

  • DOI: 10.1038/s41598-018-22177-0
  • Primary Citation of Related Structures:  
    5XN4

  • PubMed Abstract: 
  • The bacterial CRISPR-Cas system provides adaptive immunity against invading phages. Cas9, an RNA-guided endonuclease, specifically cleaves target DNA substrates and constitutes a well-established platform for genome editing. Recently, anti-CRISPR (Ac ...

    The bacterial CRISPR-Cas system provides adaptive immunity against invading phages. Cas9, an RNA-guided endonuclease, specifically cleaves target DNA substrates and constitutes a well-established platform for genome editing. Recently, anti-CRISPR (Acr) proteins that inhibit Cas9 have been discovered, promising a useful off-switch for Cas9 to avoid undesirable off-target effects. Here, we report the solution structure and dynamics of Listeria monocytogenes AcrIIA4 that inhibits Streptococcus pyogenes Cas9 (SpyCas9). AcrIIA4 forms a compact monomeric αβββαα fold comprising three antiparallel β strands flanked by three α-helices and a short 3 10 -helix. AcrIIA4 exhibits distinct backbone dynamics in fast and slow timescales at loop regions that form interaction surfaces for SpyCas9. In particular, the β1-β2 loop that binds to the RuvC domain of SpyCas9 is highly mobile, and the β1-β2 and α2-α3 loops that bind to the RuvC and C-terminal domains of SpyCas9, respectively, undergoes conformational exchanges in microsecond-to-millisecond time scales. AcrIIA4 binds to apo-SpyCas9 with K D ~4.8 μM, which compares to K D ~0.6 nM for AcrIIA4 binding to sgRNA-bound SpyCas9. Since the binary complex between AcrIIA4 and SpyCas9 does not compete with the target DNA binding, it can effectively disable the Cas9 nuclease activity by forming a tight ternary complex in the presence of sgRNA.


    Organizational Affiliation

    Institute for Biomedical Sciences, Shinshu University, Minamiminowa, Nagano, 399-4598, Japan. jysuh@snu.ac.kr.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Anti-CRISPR AcrIIA4X87Listeria monocytogenesMutation(s): 0 
Gene Names: 
Find proteins for A0A247D711 (Listeria monocytogenes)
Explore A0A247D711 
Go to UniProtKB:  A0A247D711
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 1000 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 5XN4 Olderado

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2017-05-17 
  • Released Date: 2018-03-28 
  • Deposition Author(s): Suh, J.-Y., Kim, I.

Funding OrganizationLocationGrant Number
Cooperative Research Program for Agriculture Science & Technology Development, Rural Development AdministrationKorea, Republic OfPJ011112

Revision History 

  • Version 1.0: 2018-03-28
    Type: Initial release