Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

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

Macromolecule Content

• Total Structure Weight: 40.59 kDa 
• Atom Count: 2285 
• Residue Count: 270 
• Unique protein chains: 1

2XBZ

Multiple oligomeric forms of the Pseudomonas aeruginosa RetS sensor domain modulate accessibility to the ligand-binding site

• DOI: 10.2210/pdb2XBZ/pdb

• Classification: TRANSFERASE
• Organism(s): Pseudomonas aeruginosa
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2010-04-15 Released: 2010-06-30 
• Deposition Author(s): Vincent, F., Round, A., Reynaud, A., Bordi, C., Filloux, A., Bourne, Y.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.65 Å
• R-Value Free: 0.235 
• R-Value Work: 0.191 
• R-Value Observed: 0.195 

Literature

Distinct Oligomeric Forms of the Pseudomonas Aeruginosa Rets Sensor Domain Modulate Accessibility to the Ligand Binding Site.

Vincent, F., Round, A., Reynaud, A., Bordi, C., Filloux, A., Bourne, Y.

(2010) Environ Microbiol 12: 1775

• PubMed: 20553556 
• DOI: 10.1111/j.1462-2920.2010.02264.x
• Structures With Same Primary Citation


• PubMed Abstract: 
  

Bacterial two-component regulatory systems (TCSs) sense environmental stimuli to adapt the lifestyle of microbial populations. For many TCSs the stimulus is a ligand of unknown chemical nature. Pseudomonas aeruginosa utilizes the closely related RetS and LadS sensor kinases to switch between acute and chronic infections. These sensor proteins antagonistically mediate biofilm formation through communication with a central TCS, GacA/GacS. Recently, it was shown that RetS modulates the GacS sensor activity by forming RetS/GacS heterodimers. LadS and RetS are hybrid sensors with a signalling domain consisting of a 7-transmembrane (7TMR) region and a periplasmic sensor domain (diverse intracellular signalling module extracellular 2, DISMED2). The 2.65 A resolution crystal structure of RetS DISMED2, called RetSp, reveals three distinct oligomeric states capable of domain swapping. The RetSp structure also displays two putative ligand binding sites. One is equivalent to the analogous site in the structurally-related carbohydrate binding module (CBM) but the second site is located at a dimer interface. These observations highlight the modular architecture and assembly of the RetSp fold and give clues on how homodimerization of RetS could be modulated upon ligand binding to control formation of a RetS/GacS heterodimer. Modelling the DISMED2 of LadS reveals conservation of only one ligand binding site, suggesting a distinct mechanism underlying the activity of this sensor kinase.

---

Organizational Affiliation: 

Architecture et Fonction des Macromolécules Biologiques, UMR6098, CNRS et Universités Aix-Marseille I et II, 163 avenue de Luminy, 13288 Marseille, France. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
RETS-HYBRID SENSOR KINASE	A, B	171	Pseudomonas aeruginosa	Mutation(s): 0  EC: 2.7.13.3
Find proteins for Q9HUV7 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1)) Go to UniProtKB:  Q9HUV7

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A,B	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.65 Å
• R-Value Free: 0.235 
• R-Value Work: 0.191 
• R-Value Observed: 0.195 
• Space Group: I 4₁ 3 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 174.187	α = 90
b = 174.187	β = 90
c = 174.187	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling
PHENIX	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-04-15 
• Released Date: 2010-06-30 
Deposition Author(s): Vincent, F., Round, A., Reynaud, A., Bordi, C., Filloux, A., Bourne, Y.

Revision History 

• Version 1.0: 2010-06-30
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Advisory, Version format compliance