Anti-CRISPR-associated Aca10

Experimental Data Snapshot

  • Resolution: 1.76 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.209 

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Molecular basis of anti-CRISPR operon repression by Aca10.

Lee, S.Y.Birkholz, N.Fineran, P.C.Park, H.H.

(2022) Nucleic Acids Res 50: 8919-8928

  • DOI: https://doi.org/10.1093/nar/gkac656
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    CRISPR-Cas systems are bacterial defense systems for fighting against invaders such as bacteriophages and mobile genetic elements. To escape destruction by these bacterial immune systems, phages have co-evolved multiple anti-CRISPR (Acr) proteins, which inhibit CRISPR-Cas function. Many acr genes form an operon with genes encoding transcriptional regulators, called anti-CRISPR-associated (Aca) proteins. Aca10 is the most recently discovered Aca family that is encoded within an operon containing acrIC7 and acrIC6 in Pseudomonas citronellolis. Here, we report the high-resolution crystal structure of an Aca10 protein to unveil the molecular basis of transcriptional repressor role of Aca10 in the acrIC7-acrIC6-aca10 operon. We identified that Aca10 forms a dimer in solution, which is critical for binding specific DNA. We also showed that Aca10 directly recognizes a 21 bp palindromic sequence in the promoter of the acr operon. Finally, we revealed that R44 of Aca10 is a critical residue involved in the DNA binding, which likely results in a high degree of DNA bending.

  • Organizational Affiliation

    College of Pharmacy, Chung-Ang University, Seoul 06974, Republic of Korea.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Transcriptional regulator
A, B, C, D
65Pseudomonas citronellolisMutation(s): 0 
Gene Names: CW310_07415
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.76 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.208 
  • R-Value Observed: 0.209 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 109.92α = 90
b = 109.92β = 90
c = 60.74γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Research Foundation (NRF, Korea)Korea, Republic Of--

Revision History  (Full details and data files)

  • Version 1.0: 2023-02-22
    Type: Initial release
  • Version 1.1: 2023-11-29
    Changes: Data collection, Refinement description