Crystal structure of the ferric enterobactin receptor mutant (Q482A) from Pseudomonas aeruginosa (PfeA) in complex with enterobactin

Experimental Data Snapshot

  • Resolution: 2.96 Å
  • R-Value Free: 0.316 
  • R-Value Work: 0.301 
  • R-Value Observed: 0.302 

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The complex of ferric-enterobactin with its transporter from Pseudomonas aeruginosa suggests a two-site model.

Moynie, L.Milenkovic, S.Mislin, G.L.A.Gasser, V.Malloci, G.Baco, E.McCaughan, R.P.Page, M.G.P.Schalk, I.J.Ceccarelli, M.Naismith, J.H.

(2019) Nat Commun 10: 3673-3673

  • DOI: https://doi.org/10.1038/s41467-019-11508-y
  • Primary Citation of Related Structures:  
    5M9B, 5MZS, 5NC4, 5NR2, 5OUT, 6I2J, 6Q5E, 6R1F

  • PubMed Abstract: 

    Bacteria use small molecules called siderophores to scavenge iron. Siderophore-Fe 3+ complexes are recognised by outer-membrane transporters and imported into the periplasm in a process dependent on the inner-membrane protein TonB. The siderophore enterobactin is secreted by members of the family Enterobacteriaceae, but many other bacteria including Pseudomonas species can use it. Here, we show that the Pseudomonas transporter PfeA recognises enterobactin using extracellular loops distant from the pore. The relevance of this site is supported by in vivo and in vitro analyses. We suggest there is a second binding site deeper inside the structure and propose that correlated changes in hydrogen bonds link binding-induced structural re-arrangements to the structural adjustment of the periplasmic TonB-binding motif.

  • Organizational Affiliation

    Division of Structural Biology, Wellcome Trust Centre of Human Genomics, 7 Roosevelt Drive, Oxford, OX3 7BN, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ferric enterobactin receptor721Pseudomonas aeruginosa PAO1Mutation(s): 1 
Gene Names: pfeAPA2688
Membrane Entity: Yes 
Find proteins for Q05098 (Pseudomonas aeruginosa (strain ATCC 15692 / DSM 22644 / CIP 104116 / JCM 14847 / LMG 12228 / 1C / PRS 101 / PAO1))
Explore Q05098 
Go to UniProtKB:  Q05098
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ05098
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on EB4

Download Ideal Coordinates CCD File 
C [auth A]N,N',N''-[(3S,7S,11S)-2,6,10-trioxo-1,5,9-trioxacyclododecane-3,7,11-triyl]tris(2,3-dihydroxybenzamide)
C30 H27 N3 O15
Query on FE

Download Ideal Coordinates CCD File 
B [auth A]FE (III) ION
Experimental Data & Validation

Experimental Data

  • Resolution: 2.96 Å
  • R-Value Free: 0.316 
  • R-Value Work: 0.301 
  • R-Value Observed: 0.302 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 86.964α = 90
b = 158.288β = 90
c = 78.474γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
United Kingdom--

Revision History  (Full details and data files)

  • Version 1.0: 2019-01-16
    Type: Initial release
  • Version 1.1: 2019-08-28
    Changes: Data collection, Database references
  • Version 1.2: 2024-01-24
    Changes: Data collection, Database references, Refinement description