6V7X image
Entry Detail
PDB ID:
6V7X
Title:
Structure of a phage-encoded quorum sensing anti-activator, Aqs1 bound to LasR
Biological Source:
PDB Version:
Deposition Date:
2019-12-09
Release Date:
2020-12-16
Method Details:
Experimental Method:
Resolution:
2.90 Å
R-Value Free:
0.28
R-Value Work:
0.24
Space Group:
P 41 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:QUORUM SENSING ANTI-ACTIVATOR PROTEIN AQS1
Chain IDs:A, C
Chain Length:69
Number of Molecules:2
Biological Source:Pseudomonas virus DMS3
Polymer Type:polypeptide(L)
Description:Transcriptional regulator LasR
Chain IDs:B
Chain Length:239
Number of Molecules:1
Biological Source:Pseudomonas aeruginosa (strain UCBPP-PA14)
Ligand Molecules
Primary Citation
A phage-encoded anti-activator inhibits quorum sensing in Pseudomonas aeruginosa.
Mol.Cell 81 571 583.e6 (2021)
PMID: 33412111 DOI: 10.1016/j.molcel.2020.12.011

Abstact

The arms race between bacteria and phages has led to the evolution of diverse anti-phage defenses, several of which are controlled by quorum-sensing pathways. In this work, we characterize a quorum-sensing anti-activator protein, Aqs1, found in Pseudomonas phage DMS3. We show that Aqs1 inhibits LasR, the master regulator of quorum sensing, and present the crystal structure of the Aqs1-LasR complex. The 69-residue Aqs1 protein also inhibits PilB, the type IV pilus assembly ATPase protein, which blocks superinfection by phages that require the pilus for infection. This study highlights the remarkable ability of small phage proteins to bind multiple host proteins and disrupt key biological pathways. As quorum sensing influences various anti-phage defenses, Aqs1 provides a mechanism by which infecting phages might simultaneously dampen multiple defenses. Because quorum-sensing systems are broadly distributed across bacteria, this mechanism of phage counter-defense may play an important role in phage-host evolutionary dynamics.

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Primary Citation of related structures