1IHR

Crystal structure of the dimeric C-terminal domain of TonB


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.160 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of the dimeric C-terminal domain of TonB reveals a novel fold.

Chang, C.Mooser, A.Pluckthun, A.Wlodawer, A.

(2001) J.Biol.Chem. 276: 27535-27540

  • DOI: 10.1074/jbc.M102778200

  • PubMed Abstract: 
  • The TonB-dependent complex of Gram-negative bacteria couples the inner membrane proton motive force to the active transport of iron.siderophore and vitamin B(12) across the outer membrane. The structural basis of that process has not been described s ...

    The TonB-dependent complex of Gram-negative bacteria couples the inner membrane proton motive force to the active transport of iron.siderophore and vitamin B(12) across the outer membrane. The structural basis of that process has not been described so far in full detail. The crystal structure of the C-terminal domain of TonB from Escherichia coli has now been solved by multiwavelength anomalous diffraction and refined at 1.55-A resolution, providing the first evidence that this region of TonB (residues 164-239) dimerizes. Moreover, the structure shows a novel architecture that has no structural homologs among any known proteins. The dimer of the C-terminal domain of TonB is cylinder-shaped with a length of 65 A and a diameter of 25 A. Each monomer contains three beta strands and a single alpha helix. The two monomers are intertwined with each other, and all six beta-strands of the dimer make a large antiparallel beta-sheet. We propose a plausible model of binding of TonB to FhuA and FepA, two TonB-dependent outer-membrane receptors.


    Organizational Affiliation

    Macromolecular Crystallography Laboratory, NCI, National Institutes of Health, Frederick, Maryland 21702, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TonB protein
A, B
76Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: tonB (exbA)
Find proteins for P02929 (Escherichia coli (strain K12))
Go to UniProtKB:  P02929
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BR
Query on BR

Download SDF File 
Download CCD File 
A, B
BROMIDE ION
Br
CPELXLSAUQHCOX-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.55 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.160 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 63.770α = 90.00
b = 86.330β = 90.00
c = 26.550γ = 90.00
Software Package:
Software NamePurpose
SOLVEphasing
DENZOdata reduction
SCALEPACKdata scaling
SHELXL-97refinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-08-01
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance