3DH8

Structure of Pseudomonas Quinolone Signal Response Protein PqsE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.156 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure elucidation and preliminary assessment of hydrolase activity of PqsE, the Pseudomonas quinolone signal (PQS) response protein.

Yu, S.Jensen, V.Seeliger, J.Feldmann, I.Weber, S.Schleicher, E.Haussler, S.Blankenfeldt, W.

(2009) Biochemistry 48: 10298-10307

  • DOI: 10.1021/bi900123j
  • Primary Citation of Related Structures:  2Q0I, 2Q0J

  • PubMed Abstract: 
  • In bacteria, the transcription of virulence genes is usually controlled by a cell density-dependent process known as "quorum sensing" (QS). QS relies on small diffusible signaling molecules that cross the bacterial cell wall and activate target trans ...

    In bacteria, the transcription of virulence genes is usually controlled by a cell density-dependent process known as "quorum sensing" (QS). QS relies on small diffusible signaling molecules that cross the bacterial cell wall and activate target transcription factors after a threshold concentration has been reached. Besides two hierarchical QS circuits based on N-acylhomoserine lactones, the human opportunistic pathogen Pseudomonas aeruginosa integrates a signaling system that depends on 2-heptyl-3-hydroxy-4-quinolone, termed "Pseudomonas quinolone signal" (PQS). PQS is produced from genes encoded in the pqs operon, which in addition to the biosynthetic enzymes PqsA-D contains a fifth gene, pqsE, that is not required for production of PQS but whose disruption leads to loss of signal transduction in several but not all pqs operon-dependent processes. PqsE was hence termed "PQS response protein", but its exact mechanism of action is unknown. We have determined the crystal structure of recombinant PqsE and show that it possesses a metallo-beta-lactamase fold with an Fe(II)Fe(III) center in the active site. A copurified ligand was assigned as benzoate and may indicate that PqsE exerts its regulatory effect by converting a chorismate-derived molecule. Further, PqsE was found to slowly hydrolyze phosphodiesters including single- and double-stranded DNA as well as mRNA and also the thioester S-(4-nitrobenzoyl)mercaptoethane. Higher activity was observed after incubation with Co(2+) and, to lesser entent, Mn(2+), suggesting that the Fe(II)Fe(III) center of recombinant PqsE may be an artifact of heterologous expression. A crystal complex of the E182A mutant with bis-pNPP was obtained and suggests a catalytic mechanism for hydrolysis.


    Organizational Affiliation

    Department of Physical Biochemistry, Max-Planck-Institute of Molecular Physiology, 44227 Dortmund, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Uncharacterized protein PA1000
A
303Pseudomonas aeruginosa (strain ATCC 15692 / PAO1 / 1C / PRS 101 / LMG 12228)N/A
Find proteins for P20581 (Pseudomonas aeruginosa (strain ATCC 15692 / PAO1 / 1C / PRS 101 / LMG 12228))
Go to UniProtKB:  P20581
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FE
Query on FE

Download SDF File 
Download CCD File 
A
FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
 Ligand Interaction
B4N
Query on B4N

Download SDF File 
Download CCD File 
A
bis(4-nitrophenyl) hydrogen phosphate
C12 H9 N2 O8 P
MHSVUSZEHNVFKW-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.156 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 60.980α = 90.00
b = 60.980β = 90.00
c = 146.820γ = 120.00
Software Package:
Software NamePurpose
XDSdata reduction
ADSCdata collection
REFMACrefinement
XSCALEdata scaling
REFMACphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-06-23
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance