7N35 image
Deposition Date 2021-05-31
Release Date 2021-11-17
Last Version Date 2024-10-23
Entry Detail
PDB ID:
7N35
Keywords:
Title:
Structure of Yersinia aleksiciae Cap15 cyclic dinucleotide receptor, crystal form 2
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.60 Å
R-Value Free:
0.31
R-Value Work:
0.29
R-Value Observed:
0.29
Space Group:
P 61
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Cap15
Chain IDs:A, B
Chain Length:131
Number of Molecules:2
Biological Source:Yersinia aleksiciae
Ligand Molecules
Primary Citation
Effector-mediated membrane disruption controls cell death in CBASS antiphage defense.
Mol.Cell 81 5039 ? (2021)
PMID: 34784509 DOI: 10.1016/j.molcel.2021.10.020

Abstact

Cyclic oligonucleotide-based antiphage signaling systems (CBASS) are antiviral defense operons that protect bacteria from phage replication. Here, we discover a widespread class of CBASS transmembrane (TM) effector proteins that respond to antiviral nucleotide signals and limit phage propagation through direct membrane disruption. Crystal structures of the Yersinia TM effector Cap15 reveal a compact 8-stranded β-barrel scaffold that forms a cyclic dinucleotide receptor domain that oligomerizes upon activation. We demonstrate that activated Cap15 relocalizes throughout the cell and specifically induces rupture of the inner membrane. Screening for active effectors, we identify the function of distinct families of CBASS TM effectors and demonstrate that cell death via disruption of inner-membrane integrity is a common mechanism of defense. Our results reveal the function of the most prominent class of effector protein in CBASS immunity and define disruption of the inner membrane as a widespread strategy of abortive infection in bacterial phage defense.

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