9B7D image
Deposition Date 2024-03-27
Release Date 2025-01-22
Last Version Date 2025-04-02
Entry Detail
PDB ID:
9B7D
Keywords:
Title:
Structure of ThsB-Tad3 complex
Biological Source:
Source Organism:
Bacillus cereus (Taxon ID: 1396)
metagenome (Taxon ID: 256318)
Method Details:
Experimental Method:
Resolution:
1.80 Å
R-Value Free:
0.22
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Putative cyclic ADP-D-ribose synthase ThsB1
Gene (Uniprot):thsB1
Chain IDs:A, C
Chain Length:193
Number of Molecules:2
Biological Source:Bacillus cereus
Polymer Type:polypeptide(L)
Molecule:Tad3
Chain IDs:B, D
Chain Length:194
Number of Molecules:2
Biological Source:metagenome
Primary Citation
Structure-guided discovery of viral proteins that inhibit host immunity.
Cell 188 1681 ? (2025)
PMID: 39855193 DOI: 10.1016/j.cell.2024.12.035

Abstact

Viruses encode proteins that inhibit host defenses, but sifting through the millions of available viral sequences for immune-modulatory proteins has been so far impractical. Here, we develop a process to systematically screen virus-encoded proteins for inhibitors that physically bind host immune proteins. Focusing on Thoeris and CBASS, bacterial defense systems that are the ancestors of eukaryotic Toll/interleukin-1 receptor (TIR) and cyclic GMP-AMP synthase (cGAS) immunity, we discover seven families of Thoeris and CBASS inhibitors, encompassing thousands of genes widespread in phages. Verified inhibitors exhibit extensive physical interactions with the respective immune protein counterpart, with all inhibitors blocking the active site of the immune protein. Remarkably, a phage-encoded inhibitor of bacterial TIR proteins can bind and inhibit distantly related human and plant immune TIRs, and a phage-derived inhibitor of bacterial cGAS-like enzymes can inhibit the human cGAS. Our results demonstrate that phages are a reservoir for immune-modulatory proteins capable of inhibiting bacterial, animal, and plant immunity.

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