1QJQ

FERRIC HYDROXAMATE RECEPTOR FROM ESCHERICHIA COLI (FHUA)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.225 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

Crystal structure of the antibiotic albomycin in complex with the outer membrane transporter FhuA.

Ferguson, A.D.Braun, V.Fiedler, H.P.Coulton, J.W.Diederichs, K.Welte, W.

(2000) Protein Sci 9: 956-963

  • DOI: 10.1110/ps.9.5.956
  • Primary Citation of Related Structures:  
    1QKC, 1QJQ

  • PubMed Abstract: 
  • One alternative method for drug delivery involves the use of siderophore-antibiotic conjugates. These compounds represent a specific means by which potent antimicrobial agents, covalently linked to iron-chelating siderophores, can be actively transported across the outer membrane of gram-negative bacteria ...

    One alternative method for drug delivery involves the use of siderophore-antibiotic conjugates. These compounds represent a specific means by which potent antimicrobial agents, covalently linked to iron-chelating siderophores, can be actively transported across the outer membrane of gram-negative bacteria. These "Trojan Horse" antibiotics may prove useful as an efficient means to combat multi-drug-resistant bacterial infections. Here we present the crystallographic structures of the natural siderophore-antibiotic conjugate albomycin and the siderophore phenylferricrocin, in complex with the active outer membrane transporter FhuA from Escherichia coli. To our knowledge, this represents the first structure of an antibiotic bound to its cognate transporter. Albomycins are broad-host range antibiotics that consist of a hydroxamate-type iron-chelating siderophore, and an antibiotically active, thioribosyl pyrimidine moiety. As observed with other hydroxamate-type siderophores, the three-dimensional structure of albomycin reveals an identical coordination geometry surrounding the ferric iron atom. Unexpectedly, this antibiotic assumes two conformational isomers in the binding site of FhuA, an extended and a compact form. The structural information derived from this study provides novel insights into the diverse array of antibiotic moieties that can be linked to the distal portion of iron-chelating siderophores and offers a structural platform for the rational design of hydroxamate-type siderophore-antibiotic conjugates.


    Related Citations: 
    • An Internal Affinity-Tag for Purification and Crystallization of the Siderophore Receptor Fhua, Integral Outer Membrane Protein from Escherichia Coli K-12
      Ferguson, A.D., Breed, J., Diederichs, K., Welte, W., Coulton, J.W.
      (1998) Protein Sci 7: 1636
    • Siderophore-Mediated Iron Transport: Crystal Structure of Fhua with Bound Lipopolysaccharide
      Ferguson, A.D., Hofmann, E., Coulton, J.W., Diederichs, K., Welte, W.
      (1998) Science 282: 2210

    Organizational Affiliation

    Fachbereich Biologie, Universität Konstanz, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
FERRIC HYDROXAMATE RECEPTOR A725Escherichia coli K-12Mutation(s): 0 
Gene Names: fhuAtonAb0150JW0146
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Beta-Barrel Membrane Proteins: Monomeric/Dimeric
Protein: 
FhuA in complex with albomycin
Find proteins for P06971 (Escherichia coli (strain K12))
Explore P06971 
Go to UniProtKB:  P06971
Protein Feature View
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
alpha-D-glucopyranose-(1-2)-alpha-D-glucopyranose-(1-3)-[alpha-D-galactopyranose-(1-6)]alpha-D-glucopyranose-(1-3)-[L-glycero-alpha-D-manno-heptopyranose-(1-7)]L-glycero-alpha-D-manno-heptopyranose-(1-3)-L-glycero-alpha-D-manno-heptopyranose-(1-5)-[3-deoxy-alpha-D-manno-oct-2-ulopyranosonic acid-(2-4)]3-deoxy-alpha-D-manno-oct-2-ulopyranosonic acid-(2-6)-2-amino-2,3-dideoxy-alpha-D-glucoyranose-(1-6)-2-amino-2,3-dideoxy-alpha-D-glucoyranose
B
11 N/A Oligosaccharides Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.225 
  • R-Value Observed: 0.225 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 172.1α = 90
b = 172.1β = 90
c = 87.65γ = 120
Software Package:
Software NamePurpose
CNSrefinement
XDSdata reduction
XSCALEdata scaling
CNSphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-06-05
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-01-17
    Changes: Data collection
  • Version 1.4: 2019-10-09
    Changes: Data collection, Database references, Derived calculations, Other
  • Version 1.5: 2020-07-01
    Changes: Advisory, Data collection, Derived calculations
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Structure summary