3QLB

Enantiopyochelin outer membrane TonB-dependent transporter from Pseudomonas fluorescens bound to the ferri-enantiopyochelin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.26 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.214 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Pyochelin enantiomers and their outer-membrane siderophore transporters in fluorescent pseudomonads: structural bases for unique enantiospecific recognition

Brillet, K.Reimmann, C.Mislin, G.L.A.Noel, S.Rognan, D.Schalk, I.J.Cobessi, D.

(2011) J.Am.Chem.Soc. 133: 16503-16509

  • DOI: 10.1021/ja205504z

  • PubMed Abstract: 
  • Pyochelin (Pch) and enantiopyochelin (EPch) are enantiomeric siderophores, with three chiral centers, produced under iron limitation conditions by Pseudomonas aeruginosa and Pseudomonas fluorescens , respectively. After iron chelation in the extracel ...

    Pyochelin (Pch) and enantiopyochelin (EPch) are enantiomeric siderophores, with three chiral centers, produced under iron limitation conditions by Pseudomonas aeruginosa and Pseudomonas fluorescens , respectively. After iron chelation in the extracellular medium, Pch-Fe and EPch-Fe are recognized and transported by their specific outer-membrane transporters: FptA in P. aeruginosa and FetA in P. fluorescens . Structural analysis of FetA-EPch-Fe and FptA-Pch-Fe, combined with mutagenesis and docking studies revealed the structural basis of the stereospecific recognition of these enantiomers by their respective transporters. Whereas FetA and FptA have a low sequence identity but high structural homology, the Pch and EPch binding pockets do not share any structural homology, but display similar physicochemical properties. The stereospecific recognition of both enantiomers by their corresponding transporters is imposed by the configuration of the siderophore's C4'' and C2'' chiral centers. This recognition involves specific hydrogen bonds between the Arg91 guanidinium group and EPch-Fe for FetA and between the Leu117-Leu116 main chain and Pch-Fe for FptA. FetA and FptA are the first membrane receptors to be structurally described with opposite binding enantioselectivities for their ligands, giving insights into the structural basis of their enantiospecificity.


    Organizational Affiliation

    UMR 7242 Biotechnologie et Signalisation Cellulaire, Université de Strasbourg-CNRS, Irebs-ESBS, Boulevard Sébastien Brant, 67412 Illkirch, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Enantio-pyochelin receptor
A, B
748Pseudomonas fluorescensMutation(s): 0 
Gene Names: fetA
Find proteins for C5I2D9 (Pseudomonas fluorescens)
Go to UniProtKB:  C5I2D9
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CIT
Query on CIT

Download SDF File 
Download CCD File 
A, B
CITRIC ACID
C6 H8 O7
KRKNYBCHXYNGOX-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

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

Download SDF File 
Download CCD File 
A, B
ENANTIO-PYOCHELIN FE(III)
C14 H14 Fe N2 O3 S2
CWTAFCSYRCPPIK-XBIQSCFXSA-L
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
EFEKd: 3.7 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.26 Å
  • R-Value Free: 0.259 
  • R-Value Work: 0.214 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 155.070α = 90.00
b = 170.830β = 90.00
c = 232.620γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
XDSdata scaling
X-NEMOdata collection
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-12-07
    Type: Initial release