Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 25.10 kDa 
• Atom Count: 1865 
• Residue Count: 210 
• Unique protein chains: 1

2HJE

Crystal structure of Vibrio harveyi LuxQ periplasmic domain

• DOI: 10.2210/pdb2HJE/pdb

• Classification: SIGNALING PROTEIN
• Organism(s): Vibrio harveyi
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2006-06-30 Released: 2006-09-26 
• Deposition Author(s): Neiditch, M.B., Kelly, R.C., Hughson, F.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free: 0.237 
• R-Value Work: 0.194 
• R-Value Observed: 0.197 

Literature

Ligand-induced asymmetry in histidine sensor kinase complex regulates quorum sensing.

Neiditch, M.B., Federle, M.J., Pompeani, A.J., Kelly, R.C., Swem, D.L., Jeffrey, P.D., Bassler, B.L., Hughson, F.M.

(2006) Cell 126: 1095-1108

• PubMed: 16990134 
• DOI: 10.1016/j.cell.2006.07.032
• Primary Citation of Related Structures:  
  2HJE, 2HJ9


• PubMed Abstract: 
  

Bacteria sense their environment using receptors of the histidine sensor kinase family, but how kinase activity is regulated by ligand binding is not well understood. Autoinducer-2 (AI-2), a secreted signaling molecule originally identified in studies of the marine bacterium Vibrio harveyi, regulates quorum-sensing responses and allows communication between different bacterial species. AI-2 signal transduction in V. harveyi requires the integral membrane receptor LuxPQ, comprised of periplasmic binding protein (LuxP) and histidine sensor kinase (LuxQ) subunits. Combined X-ray crystallographic and functional studies show that AI-2 binding causes a major conformational change within LuxP, which in turn stabilizes a quaternary arrangement in which two LuxPQ monomers are asymmetrically associated. We propose that formation of this asymmetric quaternary structure is responsible for repressing the kinase activity of both LuxQ subunits and triggering the transition of V. harveyi into quorum-sensing mode.

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Organizational Affiliation: 

Department of Molecular Biology, Princeton University, Princeton, NJ 08544, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Autoinducer 2 sensor kinase/phosphatase luxQ	A	221	Vibrio harveyi	Mutation(s): 0  Gene Names: luxQ EC: 2.7.13.3 (PDB Primary Data), 3.1.3 (UniProt)
Find proteins for P54302 (Vibrio harveyi) Explore P54302  Go to UniProtKB:  P54302

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NI	A	NICKEL (II) ION Ni VEQPNABPJHWNSG-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free: 0.237 
• R-Value Work: 0.194 
• R-Value Observed: 0.197 
• Space Group: P 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 33.446	α = 82.18
b = 36.152	β = 86.14
c = 49.185	γ = 67.28

Software Package:

Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling
MOLREP	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-06-30 
• Released Date: 2006-09-26 
Deposition Author(s): Neiditch, M.B., Kelly, R.C., Hughson, F.M.

Revision History 

• Version 1.0: 2006-09-26
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance