1QXX

CRYSTAL STRUCTURE OF THE C-TERMINAL DOMAIN OF TONB


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.267 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Dimerization of TonB is not essential for its binding to the outer membrane siderophore receptor FhuA of Escherichia coli.

Koedding, J.Howard, P.Kaufmann, L.Polzer, P.Lustig, A.Welte, W.

(2004) J Biol Chem 279: 9978-9986

  • DOI: 10.1074/jbc.M311720200
  • Primary Citation of Related Structures:  
    1QXX

  • PubMed Abstract: 
  • FhuA belongs to a family of specific siderophore transport systems located in the outer membrane of Escherichia coli. The energy required for the transport process is provided by the proton motive force of the cytoplasmic membrane and is transmitted to FhuA by the protein TonB ...

    FhuA belongs to a family of specific siderophore transport systems located in the outer membrane of Escherichia coli. The energy required for the transport process is provided by the proton motive force of the cytoplasmic membrane and is transmitted to FhuA by the protein TonB. Although the structure of full-length TonB is not known, the structure of the last 77 residues of a fragment composed of the 86 C-terminal amino acids was recently solved and shows an intertwined dimer (Chang, C., Mooser, A., Pluckthun, A., and Wlodawer, A. (2001) J. Biol. Chem. 276, 27535-27540). We analyzed the ability of truncated C-terminal TonB fragments of different lengths (77, 86, 96, 106, 116, and 126 amino acid residues, respectively) to bind to the receptor FhuA. Only the shortest TonB fragment, TonB-77, could not effectively interact with FhuA. We have also observed that the fragments TonB-77 and TonB-86 form homodimers in solution, whereas the longer fragments remain monomeric. TonB fragments that bind to FhuA in vitro also inhibit ferrichrome uptake via FhuA in vivo and protect cells against attack by bacteriophage Phi80.


    Organizational Affiliation

    Fakultaet fuer Biologie, Universitaet Konstanz, Germany.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
TonB proteinA76Escherichia coliMutation(s): 0 
Gene Names: tonB
UniProt
Find proteins for P02929 (Escherichia coli (strain K12))
Explore P02929 
Go to UniProtKB:  P02929
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP02929
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.267 
  • Space Group: P 64 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.58α = 90
b = 61.58β = 90
c = 121.95γ = 120
Software Package:
Software NamePurpose
XDSdata scaling
XDSdata reduction
MOLREPphasing
REFMACrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-04-06
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance