1KMP

Crystal structure of the Outer Membrane Transporter FecA Complexed with Ferric Citrate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.242 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.5 of the entry. See complete history


Literature

Structural basis of gating by the outer membrane transporter FecA.

Ferguson, A.D.Chakraborty, R.Smith, B.S.Esser, L.van der Helm, D.Deisenhofer, J.

(2002) Science 295: 1715-1719

  • DOI: https://doi.org/10.1126/science.1067313
  • Primary Citation of Related Structures:  
    1KMO, 1KMP

  • PubMed Abstract: 

    Siderophore-mediated acquisition systems facilitate iron uptake. We present the crystallographic structure of the integral outer membrane receptor FecA from Escherichia coli with and without ferric citrate at 2.5 and 2.0 angstrom resolution. FecA is composed of three distinct domains: the barrel, plug, and NH2-terminal extension. Binding of ferric citrate triggers a conformational change of the extracellular loops that close the external pocket of FecA. Ligand-induced allosteric transitions are propagated through the outer membrane by the plug domain, signaling the occupancy of the receptor in the periplasm. These data establish the structural basis of gating for receptors dependent on the cytoplasmic membrane protein TonB. By compiling available data for this family of receptors, we propose a mechanism for the energy-dependent transport of siderophores.


  • Organizational Affiliation

    Howard Hughes Medical Institute and Department of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
IRON(III) DICITRATE TRANSPORT PROTEIN FECA774Escherichia coli K-12Mutation(s): 0 
Gene Names: fecA
Membrane Entity: Yes 
UniProt
Find proteins for P13036 (Escherichia coli (strain K12))
Explore P13036 
Go to UniProtKB:  P13036
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP13036
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
LDA
Query on LDA

Download Ideal Coordinates CCD File 
D [auth A]
F [auth A]
H [auth A]
I [auth A]
J [auth A]
D [auth A],
F [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth A],
M [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]
LAURYL DIMETHYLAMINE-N-OXIDE
C14 H31 N O
SYELZBGXAIXKHU-UHFFFAOYSA-N
CIT
Query on CIT

Download Ideal Coordinates CCD File 
C [auth A],
G [auth A]
CITRIC ACID
C6 H8 O7
KRKNYBCHXYNGOX-UHFFFAOYSA-N
FE
Query on FE

Download Ideal Coordinates CCD File 
B [auth A],
E [auth A]
FE (III) ION
Fe
VTLYFUHAOXGGBS-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
MSE
Query on MSE
A
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.282 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.242 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 117.467α = 90
b = 88.762β = 90
c = 95.071γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
SnBphasing
CNSrefinement
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-03-06
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2011-11-02
    Changes: Non-polymer description
  • Version 1.4: 2017-10-11
    Changes: Refinement description
  • Version 1.5: 2024-04-03
    Changes: Data collection, Database references, Derived calculations, Refinement description