2GSK

Structure of the BtuB:TonB Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.196 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Outer membrane active transport: structure of the BtuB:TonB complex

Shultis, D.D.Purdy, M.D.Banchs, C.N.Wiener, M.C.

(2006) Science 312: 1396-1399

  • DOI: 10.1126/science.1127694

  • PubMed Abstract: 
  • In Gram-negative bacteria, the import of essential micronutrients across the outer membrane requires a transporter, an electrochemical gradient of protons across the inner membrane, and an inner membrane protein complex (ExbB, ExbD, TonB) that couple ...

    In Gram-negative bacteria, the import of essential micronutrients across the outer membrane requires a transporter, an electrochemical gradient of protons across the inner membrane, and an inner membrane protein complex (ExbB, ExbD, TonB) that couples the proton-motive force to the outer membrane transporter. The inner membrane protein TonB binds directly to a conserved region, called the Ton-box, of the transporter. We solved the structure of the cobalamin transporter BtuB in complex with the C-terminal domain of TonB. In contrast to its conformations in the absence of TonB, the Ton-box forms a beta strand that is recruited to the existing beta sheet of TonB, which is consistent with a mechanical pulling model of transport.


    Related Citations: 
    • Crystallization and preliminary x-ray crystallographic analysis of the Escherichia coli outer membrane cobalamin transporter BtuB in complex with the carboxy-terminal domain of TonB
      Shultis, D.D.,Purdy, M.D.,Banchs, C.N.,Wiener, M.C.
      (2006) Acta Crystallogr.,Sect.F --: --


    Organizational Affiliation

    Department of Molecular Physiology and Biological Physics, University of Virginia, Charlottesville, VA 22908, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Vitamin B12 transporter btuB
A
590Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: btuB (bfe, cer, dcrC)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Beta-Barrel Membrane Proteins: Monomeric/Dimeric
Protein: 
apo BtuB cobalamin transporter
Find proteins for P06129 (Escherichia coli (strain K12))
Go to UniProtKB:  P06129
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
protein TONB
B
81Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: tonB (exbA)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL
Sub Group: 
Beta-Barrel Membrane Proteins: Monomeric/Dimeric
Protein: 
apo BtuB cobalamin transporter
Find proteins for P02929 (Escherichia coli (strain K12))
Go to UniProtKB:  P02929
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
OCT
Query on OCT

Download SDF File 
Download CCD File 
A
N-OCTANE
C8 H18
TVMXDCGIABBOFY-UHFFFAOYSA-N
 Ligand Interaction
CA
Query on CA

Download SDF File 
Download CCD File 
A
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
LDA
Query on LDA

Download SDF File 
Download CCD File 
A
LAURYL DIMETHYLAMINE-N-OXIDE
C14 H31 N O
SYELZBGXAIXKHU-UHFFFAOYSA-N
 Ligand Interaction
CNC
Query on CNC

Download SDF File 
Download CCD File 
A
CO-CYANOCOBALAMIN
C63 H88 Co N14 O14 P
OEEKSCBDGPRZJZ-BYLSPCLQSA-N
 Ligand Interaction
HEX
Query on HEX

Download SDF File 
Download CCD File 
A
HEXANE
C6 H14
VLKZOEOYAKHREP-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.196 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 74.340α = 90.00
b = 82.439β = 90.00
c = 122.632γ = 90.00
Software Package:
Software NamePurpose
SERGUIdata collection
SCALEPACKdata scaling
DENZOdata reduction
MAR345data collection
MOLREPphasing
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2006-06-13
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.3: 2017-10-18
    Type: Refinement description
  • Version 1.4: 2017-11-01
    Type: Refinement description