1FCP

FERRIC HYDROXAMATE UPTAKE RECEPTOR (FHUA) FROM E.COLI IN COMPLEX WITH BOUND FERRICHROME-IRON


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.232 

wwPDB Validation 3D Report Full Report


This is version 1.5 of the entry. See complete history

Literature

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: 2215-2220

  • Primary Citation of Related Structures:  
  • Also Cited By: 1QKC, 1QJQ

  • PubMed Abstract: 
  • FhuA, the receptor for ferrichrome-iron in Escherichia coli, is a member of a family of integral outer membrane proteins, which, together with the energy-transducing protein TonB, mediate the active transport of ferric siderophores across the outer m ...

    FhuA, the receptor for ferrichrome-iron in Escherichia coli, is a member of a family of integral outer membrane proteins, which, together with the energy-transducing protein TonB, mediate the active transport of ferric siderophores across the outer membrane of Gram-negative bacteria. The three-dimensional structure of FhuA is presented here in two conformations: with and without ferrichrome-iron at resolutions of 2.7 and 2.5 angstroms, respectively. FhuA is a beta barrel composed of 22 antiparallel beta strands. In contrast to the typical trimeric arrangement found in porins, FhuA is monomeric. Located within the beta barrel is a structurally distinct domain, the "cork," which mainly consists of a four-stranded beta sheet and four short alpha helices. A single lipopolysaccharide molecule is noncovalently associated with the membrane-embedded region of the protein. Upon binding of ferrichrome-iron, conformational changes are transduced to the periplasmic pocket of FhuA, signaling the ligand-loaded status of the receptor. Sequence homologies and mutagenesis data are used to propose a structural mechanism for TonB-dependent siderophore-mediated transport across the outer membrane.


    Organizational Affiliation

    Department of Microbiology and Immunology, McGill University, 3775 University Street, Montreal, Quebec, Canada H3A 2B4.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (FERRIC HYDROXAMATE UPTAKE RECEPTOR)
A
705Escherichia coli (strain K12)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 13 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EA2
Query on EA2

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A
AMINOETHANOLPYROPHOSPHATE
C2 H9 N O7 P2
VOBNSQKMDIOJTQ-UHFFFAOYSA-N
 Ligand Interaction
GP4
Query on GP4

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A
GLUCOSAMINE 4-PHOSPHATE
C6 H14 N O8 P
QWDBGVNDGYUIAC-UKFBFLRUSA-N
 Ligand Interaction
GLC
Query on GLC

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

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A
2-TRIDECANOYLOXY-PENTADECANOIC ACID
C28 H54 O4
WLKQLKMXKFGMQI-SANMLTNESA-N
 Ligand Interaction
AAE
Query on AAE

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A
ACETOACETIC ACID
C4 H6 O3
WDJHALXBUFZDSR-UHFFFAOYSA-N
 Ligand Interaction
FCI
Query on FCI

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A
FERRICROCIN-IRON
C28 H44 Fe N9 O13
FNBCUYMSQPYITB-JWBZYWNVDF
 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
GP1
Query on GP1

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A
GLUCOSAMINE 1-PHOSPHATE
C6 H14 N O8 P
YMJBYRVFGYXULK-QZABAPFNSA-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
GPH
Query on GPH

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A
4-O-phosphono-D-glycero-beta-D-manno-heptopyranose
C7 H15 O10 P
JDFMKMOMBHLESC-XQCVOTFFSA-N
 Ligand Interaction
LIM
Query on LIM

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A
3-OXO-PENTADECANOIC ACID
C15 H28 O3
CJTNJZWHYGHVCD-UHFFFAOYSA-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
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.281 
  • R-Value Work: 0.232 
  • Space Group: P 61
Unit Cell:
Length (Å)Angle (°)
a = 171.400α = 90.00
b = 171.400β = 90.00
c = 85.700γ = 120.00
Software Package:
Software NamePurpose
XSCALEdata scaling
XDSdata reduction
SHARPphasing
SOLVEphasing
XDSdata scaling
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-01-13
    Type: Initial release
  • Version 1.1: 2008-04-02
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Source and taxonomy, Version format compliance
  • Version 1.3: 2014-11-19
    Type: Other
  • Version 1.4: 2016-02-17
    Type: Non-polymer description
  • Version 1.5: 2018-03-07
    Type: Data collection