7QFZ image
Entry Detail
PDB ID:
7QFZ
Title:
BrxR, a WYL-domain containing transcriptional regulator
Biological Source:
PDB Version:
Deposition Date:
2021-12-07
Release Date:
2022-05-18
Method Details:
Experimental Method:
Resolution:
2.15 Å
R-Value Free:
0.24
R-Value Work:
0.21
R-Value Observed:
0.22
Space Group:
P 41 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:WYL domain-containing protein
Chain IDs:A, B, C, D, E, F, G, H
Chain Length:295
Number of Molecules:8
Biological Source:Escherichia fergusonii ATCC 35469
Ligand Molecules
Primary Citation
A widespread family of WYL-domain transcriptional regulators co-localizes with diverse phage defence systems and islands.
Nucleic Acids Res. 50 5191 5207 (2022)
PMID: 35544231 DOI: 10.1093/nar/gkac334

Abstact

Bacteria are under constant assault by bacteriophages and other mobile genetic elements. As a result, bacteria have evolved a multitude of systems that protect from attack. Genes encoding bacterial defence mechanisms can be clustered into 'defence islands', providing a potentially synergistic level of protection against a wider range of assailants. However, there is a comparative paucity of information on how expression of these defence systems is controlled. Here, we functionally characterize a transcriptional regulator, BrxR, encoded within a recently described phage defence island from a multidrug resistant plasmid of the emerging pathogen Escherichia fergusonii. Using a combination of reporters and electrophoretic mobility shift assays, we discovered that BrxR acts as a repressor. We present the structure of BrxR to 2.15 Å, the first structure of this family of transcription factors, and pinpoint a likely binding site for ligands within the WYL-domain. Bioinformatic analyses demonstrated that BrxR-family homologues are widespread amongst bacteria. About half (48%) of identified BrxR homologues were co-localized with a diverse array of known phage defence systems, either alone or clustered into defence islands. BrxR is a novel regulator that reveals a common mechanism for controlling the expression of the bacterial phage defence arsenal.

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