5TCY

A complex of the synthetic siderophore analogue Fe(III)-5-LICAM with CeuE (H227L variant), a periplasmic protein from Campylobacter jejuni.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.174 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Interactions of the periplasmic binding protein CeuE with Fe(III) n-LICAM(4-) siderophore analogues of varied linker length.

Wilde, E.J.Hughes, A.Blagova, E.V.Moroz, O.V.Thomas, R.P.Turkenburg, J.P.Raines, D.J.Duhme-Klair, A.K.Wilson, K.S.

(2017) Sci Rep 7: 45941-45941

  • DOI: https://doi.org/10.1038/srep45941
  • Primary Citation of Related Structures:  
    5A5D, 5A5V, 5AD1, 5LWH, 5LWQ, 5MBQ, 5MBT, 5MBU, 5TCY

  • PubMed Abstract: 

    Bacteria use siderophores to mediate the transport of essential Fe(III) into the cell. In Campylobacter jejuni the periplasmic binding protein CeuE, an integral part of the Fe(III) transport system, has adapted to bind tetradentate siderophores using a His and a Tyr side chain to complete the Fe(III) coordination. A series of tetradentate siderophore mimics was synthesized in which the length of the linker between the two iron-binding catecholamide units was increased from four carbon atoms (4-LICAM 4- ) to five, six and eight (5-, 6-, 8-LICAM 4- , respectively). Co-crystal structures with CeuE showed that the inter-planar angles between the iron-binding catecholamide units in the 5-, 6- and 8-LICAM 4- structures are very similar (111°, 110° and 110°) and allow for an optimum fit into the binding pocket of CeuE, the inter-planar angle in the structure of 4-LICAM 4- is significantly smaller (97°) due to restrictions imposed by the shorter linker. Accordingly, the protein-binding affinity was found to be slightly higher for 5- compared to 4-LICAM 4- but decreases for 6- and 8-LICAM 4- . The optimum linker length of five matches that present in natural siderophores such as enterobactin and azotochelin. Site-directed mutagenesis was used to investigate the relative importance of the Fe(III)-coordinating residues H227 and Y288.


  • Organizational Affiliation

    Structural Biology Laboratory, Department of Chemistry, University of York, Heslington, York YO10 5DD, UK.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Enterochelin uptake periplasmic binding protein
A, B, C
291Campylobacter jejuni BJ-CJGB96299Mutation(s): 1 
Gene Names: K680_0601
UniProt
Find proteins for Q0P8Q4 (Campylobacter jejuni subsp. jejuni serotype O:2 (strain ATCC 700819 / NCTC 11168))
Explore Q0P8Q4 
Go to UniProtKB:  Q0P8Q4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ0P8Q4
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.174 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 58.696α = 82.09
b = 62.881β = 74.67
c = 69.867γ = 77.6
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
Aimlessdata scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Engineering and Physical Sciences Research CouncilUnited KingdomEP/L024829/1

Revision History  (Full details and data files)

  • Version 1.0: 2017-04-12
    Type: Initial release
  • Version 1.1: 2017-04-19
    Changes: Database references
  • Version 1.2: 2017-09-13
    Changes: Author supporting evidence
  • Version 1.3: 2024-01-17
    Changes: Data collection, Database references, Derived calculations, Refinement description