6I98

Structure of the ferrioxamine B transporter FoxA from Pseudomonas aeruginosa, apo state


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.216 

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Ligand Structure Quality Assessment 


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Literature

Ternary structure of the outer membrane transporter FoxA with resolved signalling domain provides insights into TonB-mediated siderophore uptake.

Josts, I.Veith, K.Tidow, H.

(2019) Elife 8

  • DOI: 10.7554/eLife.48528
  • Primary Citation of Related Structures:  
    6I97, 6I96, 6I98

  • PubMed Abstract: 
  • Many microbes and fungi acquire the essential ion Fe 3+ through the synthesis and secretion of high-affinity chelators termed siderophores. In Gram-negative bacteria, these ferric-siderophore complexes are actively taken up using highly specific TonB-dependent transporters (TBDTs) located in the outer bacterial membrane (OM) ...

    Many microbes and fungi acquire the essential ion Fe 3+ through the synthesis and secretion of high-affinity chelators termed siderophores. In Gram-negative bacteria, these ferric-siderophore complexes are actively taken up using highly specific TonB-dependent transporters (TBDTs) located in the outer bacterial membrane (OM). However, the detailed mechanism of how the inner-membrane protein TonB connects to the transporters in the OM as well as the interplay between siderophore- and TonB-binding to the transporter is still poorly understood. Here, we present three crystal structures of the TBDT FoxA from Pseudomonas aeruginosa (containing a signalling domain) in complex with the siderophore ferrioxamine B and TonB and combine them with a detailed analysis of binding constants. The structures show that both siderophore and TonB-binding is required to form a translocation-competent state of the FoxA transporter in a two-step TonB-binding mechanism. The complex structure also indicates how TonB-binding influences the orientation of the signalling domain.


    Organizational Affiliation

    Department of Chemistry, Institute for Biochemistry and Molecular Biology, University of Hamburg, Hamburg, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Ferric hydroxamate uptakeA677Pseudomonas aeruginosaMutation(s): 0 
Gene Names: fhuAfhuA_5C0044_18480CAZ10_13360CCBH4851_00003DZ940_30305EGY23_22030PAERUG_E15_London_28_01_14_03466
Membrane Entity: Yes 
UniProt
Find proteins for Q9I116 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q9I116 
Go to UniProtKB:  Q9I116
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
C8E (Subject of Investigation/LOI)
Query on C8E

Download Ideal Coordinates CCD File 
G [auth A], H [auth A], I [auth A], J [auth A](HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE
C16 H34 O5
FEOZZFHAVXYAMB-UHFFFAOYSA-N
 Ligand Interaction
FTT (Subject of Investigation/LOI)
Query on FTT

Download Ideal Coordinates CCD File 
K [auth A], L [auth A], M [auth A]3-HYDROXY-TETRADECANOIC ACID
C14 H28 O3
ATRNZOYKSNPPBF-CYBMUJFWSA-N
 Ligand Interaction
SO4
Query on SO4

Download Ideal Coordinates CCD File 
N [auth A] , O [auth A] , P [auth A] , Q [auth A] , R [auth A] , S [auth A] , T [auth A] , U [auth A] , 
N [auth A],  O [auth A],  P [auth A],  Q [auth A],  R [auth A],  S [auth A],  T [auth A],  U [auth A],  V [auth A],  W [auth A],  X [auth A],  Y [auth A]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GOL
Query on GOL

Download Ideal Coordinates CCD File 
C [auth A], D [auth A], E [auth A], F [auth A]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
NI
Query on NI

Download Ideal Coordinates CCD File 
B [auth A]NICKEL (II) ION
Ni
VEQPNABPJHWNSG-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

Download Ideal Coordinates CCD File 
AA [auth A], Z [auth A]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.216 
  • Space Group: P 63 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 174.554α = 90
b = 174.554β = 90
c = 180.245γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment  



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2018-11-22 
  • Released Date: 2019-08-28 
  • Deposition Author(s): Josts, I., Tidow, H.

Funding OrganizationLocationGrant Number
German Research FoundationGermany--

Revision History  (Full details and data files)

  • Version 1.0: 2019-08-28
    Type: Initial release