RCSB PDB - 8H2J: Structure of Acb2 complexed with 3',3'-cGAMP

 8H2J

Structure of Acb2 complexed with 3',3'-cGAMP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 
    0.280 (Depositor), 0.280 (DCC) 
  • R-Value Work: 
    0.244 (Depositor), 0.240 (DCC) 

Starting Model: in silico
View more details

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 

Created with Raphaël 2.3.0Worse 01 BetterLigand structure goodness of fit to experimental dataBest fitted 4BWClick on this verticalbar to view details

This is version 1.2 of the entry. See complete history


Literature

Bacteriophages inhibit and evade cGAS-like immune function in bacteria.

Huiting, E.Cao, X.Ren, J.Athukoralage, J.S.Luo, Z.Silas, S.An, N.Carion, H.Zhou, Y.Fraser, J.S.Feng, Y.Bondy-Denomy, J.

(2023) Cell 186: 864

  • DOI: https://doi.org/10.1016/j.cell.2022.12.041
  • Primary Citation of Related Structures:  
    8H2J, 8H2X, 8H39

  • PubMed Abstract: 

    A fundamental strategy of eukaryotic antiviral immunity involves the cGAS enzyme, which synthesizes 2',3'-cGAMP and activates the effector STING. Diverse bacteria contain cGAS-like enzymes that produce cyclic oligonucleotides and induce anti-phage activity, known as CBASS. However, this activity has only been demonstrated through heterologous expression. Whether bacteria harboring CBASS antagonize and co-evolve with phages is unknown. Here, we identified an endogenous cGAS-like enzyme in Pseudomonas aeruginosa that generates 3',3'-cGAMP during phage infection, signals to a phospholipase effector, and limits phage replication. In response, phages express an anti-CBASS protein ("Acb2") that forms a hexamer with three 3',3'-cGAMP molecules and reduces phospholipase activity. Acb2 also binds to molecules produced by other bacterial cGAS-like enzymes (3',3'-cUU/UA/UG/AA) and mammalian cGAS (2',3'-cGAMP), suggesting broad inhibition of cGAS-based immunity. Upon Acb2 deletion, CBASS blocks lytic phage replication and lysogenic induction, but rare phages evade CBASS through major capsid gene mutations. Altogether, we demonstrate endogenous CBASS anti-phage function and strategies of CBASS inhibition and evasion.


  • Organizational Affiliation

    Department of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94158, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
p26
A, B, C, D, E
93Pseudomonas phage PaP2Mutation(s): 0 
Gene Names: orf26
UniProt
Find proteins for A0A1C8HPQ3 (Pseudomonas phage PaMx33)
Explore A0A1C8HPQ3 
Go to UniProtKB:  A0A1C8HPQ3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A1C8HPQ3
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free:  0.280 (Depositor), 0.280 (DCC) 
  • R-Value Work:  0.244 (Depositor), 0.240 (DCC) 
Space Group: P 3 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 103.464α = 90
b = 103.464β = 90
c = 101.596γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data reduction
SCALEPACKdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 

Created with Raphaël 2.3.0Worse 01 BetterLigand structure goodness of fit to experimental dataBest fitted 4BWClick on this verticalbar to view details

Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China32171274

Revision History  (Full details and data files)

  • Version 1.0: 2023-02-22
    Type: Initial release
  • Version 1.1: 2023-03-08
    Changes: Database references
  • Version 1.2: 2024-04-03
    Changes: Data collection, Refinement description