1K2V

E. COLI PERIPLASMIC PROTEIN FHUD COMPLEXED WITH DESFERAL


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.97 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.220 

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This is version 1.2 of the entry. See complete history


Literature

X-ray crystallographic structures of the Escherichia coli periplasmic protein FhuD bound to hydroxamate-type siderophores and the antibiotic albomycin.

Clarke, T.E.Braun, V.Winkelmann, G.Tari, L.W.Vogel, H.J.

(2002) J Biol Chem 277: 13966-13972

  • DOI: 10.1074/jbc.M109385200
  • Primary Citation of Related Structures:  
    1K2V, 1K7S, 1ESZ

  • PubMed Abstract: 
  • Siderophore-binding proteins play an essential role in the uptake of iron in many Gram-positive and Gram-negative bacteria. FhuD is an ATP-binding cassette-type (ABC-type) binding protein involved in the uptake of hydroxamate-type siderophores in Esc ...

    Siderophore-binding proteins play an essential role in the uptake of iron in many Gram-positive and Gram-negative bacteria. FhuD is an ATP-binding cassette-type (ABC-type) binding protein involved in the uptake of hydroxamate-type siderophores in Escherichia coli. Structures of FhuD complexed with the antibiotic albomycin, the fungal siderophore coprogen and the drug Desferal have been determined at high resolution by x-ray crystallography. FhuD has an unusual bilobal structure for a periplasmic ligand binding protein, with two mixed beta/alpha domains connected by a long alpha-helix. The binding site for hydroxamate-type ligands is composed of a shallow pocket that lies between these two domains. Recognition of siderophores primarily occurs through interactions between the iron-hydroxamate centers of each siderophore and the side chains of several key residues in the binding pocket. Rearrangements of side chains within the binding pocket accommodate the unique structural features of each siderophore. The backbones of the siderophores are not involved in any direct interactions with the protein, demonstrating how siderophores with considerable chemical and structural diversity can be bound by FhuD. For albomycin, which consists of an antibiotic group attached to a hydroxamate siderophore, electron density for the antibiotic portion was not observed. Therefore, this study provides a basis for the rational design of novel bacteriostatic agents, in the form of siderophore-antibiotic conjugates that can act as "Trojan horses," using the hydroxamate-type siderophore uptake system to actively deliver antibiotics directly into targeted pathogens.


    Organizational Affiliation

    Structural Biology Research Group, Department of Biological Sciences, University of Calgary, 2500 University Dr. N.W., Calgary, Alberta T2N 1N4, Canada.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Ferrichrome-binding periplasmic proteinN266Escherichia coliMutation(s): 0 
Gene Names: fhuD
Find proteins for P07822 (Escherichia coli (strain K12))
Explore P07822 
Go to UniProtKB:  P07822
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DEF
Query on DEF

Download CCD File 
N
DEFEROXAMINE MESYLATE FE(III) COMPLEX
C27 H49 Fe N6 O11 S
UZNCKXZKODNQDS-XNJCSQDXCJ
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
DEFKd :  36000   nM  PDBBind
DEFKd:  36000   nM  Binding MOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.97 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.220 
  • Space Group: P 63
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 85.57α = 90
b = 85.57β = 90
c = 91.6γ = 120
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-04-17
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance