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 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystal Structure of the Antibiotic Albomycin in Complex with the Outer Membrane Protein Fhua

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

(2000) Protein Sci. 9: 956

  • DOI: 10.1110/ps.9.5.956
  • Primary Citation of Related Structures:  

  • 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 transpo ...

    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: 
    • 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
    • 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


    Organizational Affiliation

    Fachbereich Biologie, Universit├Ąt Konstanz, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
FERRIC HYDROXAMATE RECEPTOR
A
725Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: fhuA (tonA)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Beta-Barrel Membrane Proteins: Monomeric/Dimeric
Protein: 
FhuA, Ferrichrome-iron receptor without ligand
Find proteins for P06971 (Escherichia coli (strain K12))
Go to UniProtKB:  P06971
Small Molecules
Ligands 10 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PFC
Query on PFC

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A
PHENYLFERRICROCIN-IRON
C34 H48 Fe N9 O12
CYHYTMBFIKKRSE-HKORQGNMDA
 Ligand Interaction
PO4
Query on PO4

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A
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
GLC
Query on GLC

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A
ALPHA-D-GLUCOSE
C6 H12 O6
WQZGKKKJIJFFOK-DVKNGEFBSA-N
 Ligand Interaction
DPO
Query on DPO

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A
DIPHOSPHATE
O7 P2
XPPKVPWEQAFLFU-UHFFFAOYSA-J
 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
GCN
Query on GCN

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A
3-DEOXY-D-GLUCOSAMINE
C6 H13 N O4
SNDZDGQLFKEBLF-MOJAZDJTSA-N
 Ligand Interaction
KDO
Query on KDO

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A
3-DEOXY-D-MANNO-OCT-2-ULOSONIC ACID
C8 H14 O8
NNLZBVFSCVTSLA-HXUQBWEZSA-N
 Ligand Interaction
NI
Query on NI

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A
NICKEL (II) ION
Ni
VEQPNABPJHWNSG-UHFFFAOYSA-N
 Ligand Interaction
GLA
Query on GLA

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A
ALPHA D-GALACTOSE
C6 H12 O6
WQZGKKKJIJFFOK-PHYPRBDBSA-N
 Ligand Interaction
GMH
Query on GMH

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A
L-GLYCERO-D-MANNO-HEPTOPYRANOSE
C7 H14 O7
BGWQRWREUZVRGI-QQABCQGCSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.95 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.225 
  • Space Group: P 61
Unit Cell:
Length (Å)Angle (°)
a = 172.100α = 90.00
b = 172.100β = 90.00
c = 87.650γ = 120.00
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling
CNSrefinement
CNSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-06-05
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2018-01-17
    Type: Data collection