9FVQ | pdb_00009fvq

Ferric-mycobactin receptor (FemA) in complex with pyochelin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.03 Å
  • R-Value Free: 
    0.223 (Depositor), 0.224 (DCC) 
  • R-Value Work: 
    0.182 (Depositor), 0.183 (DCC) 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Structure of the Outer Membrane Transporter FemA and Its Role in the Uptake of Ferric Dihydro-Aeruginoic Acid and Ferric Aeruginoic Acid in Pseudomonas aeruginosa .

Will, V.Moynie, L.Si Ahmed Charrier, E.Le Bas, A.Kuhn, L.Volck, F.Chicher, J.Aksoy, H.Madec, M.Antheaume, C.Mislin, G.L.A.Schalk, I.J.

(2025) ACS Chem Biol 20: 690-706

  • DOI: https://doi.org/10.1021/acschembio.4c00820
  • Primary Citation of Related Structures:  
    8S34, 9EX3, 9F2T, 9FVQ

  • PubMed Abstract: 

    Iron is essential for bacterial growth, and Pseudomonas aeruginosa synthesizes the siderophores pyochelin (PCH) and pyoverdine to acquire it. PCH contains a thiazolidine ring that aids in iron chelation but is prone to hydrolysis, leading to the formation of 2-(2-hydroxylphenyl)-thiazole-4-carbaldehyde (IQS). Using mass spectrometry, we demonstrated that PCH undergoes hydrolysis and oxidation in solution, resulting in the formation of aeruginoic acid (AA). This study used proteomic analyses and fluorescent reporters to show that AA, dihydroaeruginoic acid (DHA), and PCH induce the expression of femA , a gene encoding the ferri-mycobactin outer membrane transporter in P. aeruginosa . Notably, the induction by AA and DHA was observed only in strains unable to produce pyoverdine, suggesting their weaker iron-chelating ability compared to that of pyoverdine. 55 Fe uptake assays demonstrated that both AA-Fe and DHA-Fe complexes are transported via FemA; however, no uptake was observed for PCH-Fe through this transporter. Structural studies revealed that FemA is able to bind AA 2 -Fe or DHA 2 -Fe complexes. Key interactions are conserved between FemA and these two complexes, with specificity primarily driven by one of the two siderophore molecules. Interestingly, although no iron uptake was noted for PCH through FemA, the transporter also binds PCH-Fe in a similar manner. These findings show that under moderate iron deficiency, when only PCH is produced by P. aeruginosa , degradation products AA and DHA enhance iron uptake by inducing femA expression and facilitating iron transport through FemA. This provides new insights into the pathogen's strategies for iron homeostasis.


  • Organizational Affiliation
    • CNRS, University of Strasbourg, UMR7242, UMR7242, ESBS, Bld Sébastien Brant, F-67412 Strasbourg, Illkirch, France.

Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ferric-mycobactin receptor, FemA
A, B
670Pseudomonas aeruginosaMutation(s): 0 
Gene Names: femAPA1910
UniProt
Find proteins for Q9I2J4 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9I2J4 
Go to UniProtKB:  Q9I2J4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9I2J4
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 7 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
A1IG8
Query on A1IG8

Download Ideal Coordinates CCD File 
D [auth A],
RA [auth B]
Pyochelin Fe(III) isomer
C14 H14 Fe N2 O3 S2
HWRIECVKLKDJBT-VWKQLAEWSA-L
188
Query on 188

Download Ideal Coordinates CCD File 
C [auth A],
QA [auth B]
PYOCHELIN FE(III)
C14 H14 Fe N2 O3 S2
ZSCWPMBACNZOHT-CLNWDJMDSA-L
C8E
Query on C8E

Download Ideal Coordinates CCD File 
F [auth A]
FA [auth B]
K [auth A]
L [auth A]
NA [auth B]
F [auth A],
FA [auth B],
K [auth A],
L [auth A],
NA [auth B],
OA [auth B],
S [auth A],
V [auth A],
WA [auth B],
XA [auth B]
(HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE
C16 H34 O5
FEOZZFHAVXYAMB-UHFFFAOYSA-N
P2D
Query on P2D

Download Ideal Coordinates CCD File 
KA [auth B],
M [auth A]
pentane-2,4-dione
C5 H8 O2
YRKCREAYFQTBPV-UHFFFAOYSA-N
DMS
Query on DMS

Download Ideal Coordinates CCD File 
ZA [auth B]DIMETHYL SULFOXIDE
C2 H6 O S
IAZDPXIOMUYVGZ-UHFFFAOYSA-N
EDO
Query on EDO

Download Ideal Coordinates CCD File 
E [auth A]
G [auth A]
GA [auth B]
H [auth A]
HA [auth B]
E [auth A],
G [auth A],
GA [auth B],
H [auth A],
HA [auth B],
I [auth A],
IA [auth B],
J [auth A],
JA [auth B],
LA [auth B],
MA [auth B],
N [auth A],
O [auth A],
P [auth A],
PA [auth B],
Q [auth A],
R [auth A],
SA [auth B],
T [auth A],
TA [auth B],
U [auth A],
UA [auth B],
VA [auth B],
YA [auth B]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
K
Query on K

Download Ideal Coordinates CCD File 
AA [auth A]
AB [auth B]
BA [auth A]
BB [auth B]
CA [auth A]
AA [auth A],
AB [auth B],
BA [auth A],
BB [auth B],
CA [auth A],
CB [auth B],
DA [auth A],
DB [auth B],
EA [auth A],
EB [auth B],
FB [auth B],
W [auth A],
X [auth A],
Y [auth A],
Z [auth A]
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.03 Å
  • R-Value Free:  0.223 (Depositor), 0.224 (DCC) 
  • R-Value Work:  0.182 (Depositor), 0.183 (DCC) 
Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 83.836α = 89.959
b = 84.662β = 118.666
c = 86.965γ = 113.585
Software Package:
Software NamePurpose
REFMACrefinement
DIALSdata reduction
DIALSdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data

  • Released Date: 2025-02-26 
  • Deposition Author(s): Moynie, L.

Funding OrganizationLocationGrant Number
Engineering and Physical Sciences Research CouncilUnited Kingdom--

Revision History  (Full details and data files)

  • Version 1.0: 2025-02-26
    Type: Initial release
  • Version 1.1: 2025-03-12
    Changes: Database references
  • Version 1.2: 2025-04-02
    Changes: Database references