4DMZ

PelD 156-455 from Pseudomonas aeruginosa PA14, apo form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.102 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.196 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of the Cytoplasmic Region of PelD, a Degenerate Diguanylate Cyclase Receptor That Regulates Exopolysaccharide Production in Pseudomonas aeruginosa.

Whitney, J.C.Colvin, K.M.Marmont, L.S.Robinson, H.Parsek, M.R.Howell, P.L.

(2012) J.Biol.Chem. 287: 23582-23593

  • DOI: 10.1074/jbc.M112.375378
  • Primary Citation of Related Structures:  4DN0

  • PubMed Abstract: 
  • High cellular concentrations of bis-(3',5')-cyclic dimeric guanosine mono-phosphate (c-di-GMP) regulate a diverse range of phenotypes in bacteria including biofilm development. The opportunistic pathogen Pseudomonas aeruginosa produces the PEL polysa ...

    High cellular concentrations of bis-(3',5')-cyclic dimeric guanosine mono-phosphate (c-di-GMP) regulate a diverse range of phenotypes in bacteria including biofilm development. The opportunistic pathogen Pseudomonas aeruginosa produces the PEL polysaccharide to form a biofilm at the air-liquid interface of standing cultures. Among the proteins required for PEL polysaccharide production, PelD has been identified as a membrane-bound c-di-GMP-specific receptor. In this work, we present the x-ray crystal structure of a soluble cytoplasmic region of PelD in its apo and c-di-GMP complexed forms. The structure of PelD reveals an N-terminal GAF domain and a C-terminal degenerate GGDEF domain, the latter of which binds dimeric c-di-GMP at an RXXD motif that normally serves as an allosteric inhibition site for active diguanylate cyclases. Using isothermal titration calorimetry, we demonstrate that PelD binds c-di-GMP with low micromolar affinity and that mutation of residues involved in binding not only decreases the affinity of this interaction but also abrogates PEL-specific phenotypes in vivo. Bioinformatics analysis of the juxtamembrane region of PelD suggests that it contains an α-helical stalk region that connects the soluble region to the transmembrane domains and that similarly to other GAF domain containing proteins, this region likely forms a coiled-coil motif that mediates dimerization. PelD with Alg44 and BcsA of the alginate and cellulose secretion systems, respectively, collectively constitute a group of c-di-GMP receptors that appear to regulate exopolysaccharide assembly at the protein level through activation of their associated glycosyl transferases.


    Organizational Affiliation

    Program in Molecular Structure and Function, Hospital for Sick Children, Toronto, Ontario M5G 1X8, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Putative uncharacterized protein pelD
A, B
321Pseudomonas aeruginosa (strain UCBPP-PA14)Gene Names: pelD
Find proteins for A0A0H2ZD98 (Pseudomonas aeruginosa (strain UCBPP-PA14))
Go to UniProtKB:  A0A0H2ZD98
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EDO
Query on EDO

Download SDF File 
Download CCD File 
A, B
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

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Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
TRS
Query on TRS

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Download CCD File 
B
2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
TRIS BUFFER
C4 H12 N O3
LENZDBCJOHFCAS-UHFFFAOYSA-O
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.102 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.196 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 88.511α = 90.00
b = 113.346β = 90.00
c = 61.846γ = 90.00
Software Package:
Software NamePurpose
SOLVEphasing
HKL-2000data scaling
HKL-2000data collection
PHENIXrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-05-23
    Type: Initial release
  • Version 1.1: 2012-05-30
    Type: Database references
  • Version 1.2: 2012-07-25
    Type: Database references