7X9S image
Entry Detail
PDB ID:
7X9S
Title:
Crystal structure of a complex between the antirepressor GmaR and the transcriptional repressor MogR
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2022-03-16
Release Date:
2022-11-23
Method Details:
Experimental Method:
Resolution:
3.11 Å
R-Value Free:
0.24
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:GmaR
Chain IDs:A, C, E
Chain Length:413
Number of Molecules:3
Biological Source:Listeria monocytogenes
Polymer Type:polypeptide(L)
Description:Motility gene repressor MogR
Chain IDs:B, D, F
Chain Length:168
Number of Molecules:3
Biological Source:Listeria monocytogenes
Ligand Molecules
Primary Citation
Structural basis of flagellar motility regulation by the MogR repressor and the GmaR antirepressor in Listeria monocytogenes.
Nucleic Acids Res. 50 11315 11330 (2022)
PMID: 36283692 DOI: 10.1093/nar/gkac815

Abstact

The pathogenic Listeria monocytogenes bacterium produces the flagellum as a locomotive organelle at or below 30°C outside the host, but it halts flagellar expression at 37°C inside the human host to evade the flagellum-induced immune response. Listeria monocytogenes GmaR is a thermosensor protein that coordinates flagellar expression by binding the master transcriptional repressor of flagellar genes (MogR) in a temperature-responsive manner. To understand the regulatory mechanism whereby GmaR exerts the antirepression activity on flagellar expression, we performed structural and mutational analyses of the GmaR-MogR system. At or below 30°C, GmaR exists as a functional monomer and forms a circularly enclosed multidomain structure via an interdomain interaction. GmaR in this conformation recognizes MogR using the C-terminal antirepressor domain in a unique dual binding mode and mediates the antirepressor function through direct competition and spatial restraint mechanisms. Surprisingly, at 37°C, GmaR rapidly forms autologous aggregates that are deficient in MogR neutralization capabilities.

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