2FCP

FERRIC HYDROXAMATE UPTAKE RECEPTOR (FHUA) FROM E.COLI


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.242 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 3.2 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

  • DOI: https://doi.org/10.1126/science.282.5397.2215
  • Primary Citation of Related Structures:  
    1FCP, 2FCP

  • 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 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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PROTEIN (FERRIC HYDROXAMATE UPTAKE RECEPTOR)723Escherichia coli K-12Mutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P06971 (Escherichia coli (strain K12))
Explore P06971 
Go to UniProtKB:  P06971
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP06971
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-galactopyranose-(1-3)-[alpha-D-galactopyranose-(1-6)]alpha-D-glucopyranose-(1-3)-4-O-phosphono-D-glycero-beta-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-deoxy-4-O-phosphono-alpha-D-glucopyranose-(1-6)-2-amino-2-deoxy-1-O-phosphono-alpha-D-glucopyranose
B
9N/A
Glycosylation Resources
GlyTouCan:  G99426MX
GlyCosmos:  G99426MX
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
LIL
Query on LIL

Download Ideal Coordinates CCD File 
E [auth A],
F [auth A]
2-TRIDECANOYLOXY-PENTADECANOIC ACID
C28 H54 O4
WLKQLKMXKFGMQI-SANMLTNESA-N
LIM
Query on LIM

Download Ideal Coordinates CCD File 
H [auth A]3-OXO-PENTADECANOIC ACID
C15 H28 O3
CJTNJZWHYGHVCD-UHFFFAOYSA-N
EA2
Query on EA2

Download Ideal Coordinates CCD File 
I [auth A]AMINOETHANOLPYROPHOSPHATE
C2 H9 N O7 P2
VOBNSQKMDIOJTQ-UHFFFAOYSA-N
AAE
Query on AAE

Download Ideal Coordinates CCD File 
G [auth A]ACETOACETIC ACID
C4 H6 O3
WDJHALXBUFZDSR-UHFFFAOYSA-N
NI
Query on NI

Download Ideal Coordinates CCD File 
C [auth A],
D [auth A]
NICKEL (II) ION
Ni
VEQPNABPJHWNSG-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.242 
  • Space Group: P 61
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 171.55α = 90
b = 171.55β = 90
c = 87.65γ = 120
Software Package:
Software NamePurpose
XDSdata scaling
XSCALEdata scaling
CNSrefinement
XDSdata reduction
CNSphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-01-13
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance
  • Version 1.3: 2018-03-07
    Changes: Advisory, Data collection
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Structure summary
  • Version 3.0: 2020-08-05
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary
  • Version 3.1: 2020-08-19
    Changes: Data collection
  • Version 3.2: 2023-08-30
    Changes: Data collection, Database references, Refinement description