6I98

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.213 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

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:  

  • PubMed Abstract: 
  • Many microbes and fungi acquire the essential ion Fe <sup>3+ </sup> 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 s ...

    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.,The Hamburg Centre for Ultrafast Imaging, University of Hamburg, Hamburg, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ferric hydroxamate uptake
A
677Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1)Mutation(s): 0 
Gene Names: foxA
Find proteins for Q9I116 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Go to UniProtKB:  Q9I116
Small Molecules
Ligands 6 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

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A
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

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A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
C8E
Query on C8E

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A
(HYDROXYETHYLOXY)TRI(ETHYLOXY)OCTANE
C16 H34 O5
FEOZZFHAVXYAMB-UHFFFAOYSA-N
 Ligand Interaction
GOL
Query on GOL

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A
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
FTT
Query on FTT

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A
3-HYDROXY-TETRADECANOIC ACID
3-HYDROXY-MYRISTIC ACID
C14 H28 O3
ATRNZOYKSNPPBF-CYBMUJFWSA-N
 Ligand Interaction
NI
Query on NI

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A
NICKEL (II) ION
Ni
VEQPNABPJHWNSG-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.213 
  • Space Group: P 63 2 2
Unit Cell:
Length (Å)Angle (°)
a = 174.554α = 90.00
b = 174.554β = 90.00
c = 180.245γ = 120.00
Software Package:
Software NamePurpose
Aimlessdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



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 

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