5EP0

Quorum-Sensing Signal Integrator LuxO - Receiver+Catalytic Domains


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.171 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure, Regulation, and Inhibition of the Quorum-Sensing Signal Integrator LuxO.

Boyaci, H.Shah, T.Hurley, A.Kokona, B.Li, Z.Ventocilla, C.Jeffrey, P.D.Semmelhack, M.F.Fairman, R.Bassler, B.L.Hughson, F.M.

(2016) Plos Biol. 14: e1002464-e1002464

  • DOI: 10.1371/journal.pbio.1002464
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • In a process called quorum sensing, bacteria communicate with chemical signal molecules called autoinducers to control collective behaviors. In pathogenic vibrios, including Vibrio cholerae, the accumulation of autoinducers triggers repression of gen ...

    In a process called quorum sensing, bacteria communicate with chemical signal molecules called autoinducers to control collective behaviors. In pathogenic vibrios, including Vibrio cholerae, the accumulation of autoinducers triggers repression of genes responsible for virulence factor production and biofilm formation. The vibrio autoinducer molecules bind to transmembrane receptors of the two-component histidine sensor kinase family. Autoinducer binding inactivates the receptors' kinase activities, leading to dephosphorylation and inhibition of the downstream response regulator LuxO. Here, we report the X-ray structure of LuxO in its unphosphorylated, autoinhibited state. Our structure reveals that LuxO, a bacterial enhancer-binding protein of the AAA+ ATPase superfamily, is inhibited by an unprecedented mechanism in which a linker that connects the catalytic and regulatory receiver domains occupies the ATPase active site. The conformational change that accompanies receiver domain phosphorylation likely disrupts this interaction, providing a mechanistic rationale for LuxO activation. We also determined the crystal structure of the LuxO catalytic domain bound to a broad-spectrum inhibitor. The inhibitor binds in the ATPase active site and recapitulates elements of the natural regulatory mechanism. Remarkably, a single inhibitor molecule may be capable of inhibiting an entire LuxO oligomer.


    Organizational Affiliation

    Department of Molecular Biology, Princeton University, Princeton, New Jersey, United States of America.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Putative repressor protein luxO
A
396Photobacterium angustum (strain S14 / CCUG 15956)Mutation(s): 0 
Find proteins for Q1ZS18 (Photobacterium angustum (strain S14 / CCUG 15956))
Go to UniProtKB:  Q1ZS18
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
EDO
Query on EDO

Download SDF File 
Download CCD File 
A
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.171 
  • Space Group: P 61
Unit Cell:
Length (Å)Angle (°)
a = 116.149α = 90.00
b = 116.149β = 90.00
c = 71.174γ = 120.00
Software Package:
Software NamePurpose
PHASERphasing
DENZOdata reduction
PDB_EXTRACTdata extraction
SCALEPACKdata scaling
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationCountryGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesAI054442

Revision History 

  • Version 1.0: 2016-04-20
    Type: Initial release
  • Version 1.1: 2016-06-08
    Type: Database references
  • Version 1.2: 2017-09-27
    Type: Author supporting evidence, Derived calculations