2QI9

ABC-transporter BtuCD in complex with its periplasmic binding protein BtuF


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.262 

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This is version 1.2 of the entry. See complete history


Literature

Asymmetry in the structure of the ABC transporter-binding protein complex BtuCD-BtuF.

Hvorup, R.N.Goetz, B.A.Niederer, M.Hollenstein, K.Perozo, E.Locher, K.P.

(2007) Science 317: 1387-1390

  • DOI: 10.1126/science.1145950
  • Primary Citation of Related Structures:  
    2QI9

  • PubMed Abstract: 
  • BtuCD is an adenosine triphosphate-binding cassette (ABC) transporter that translocates vitamin B12 from the periplasmic binding protein BtuF into the cytoplasm of Escherichia coli. The 2.6 angstrom crystal structure of a complex BtuCD-F reveals substantial conformational changes as compared with the previously reported structures of BtuCD and BtuF ...

    BtuCD is an adenosine triphosphate-binding cassette (ABC) transporter that translocates vitamin B12 from the periplasmic binding protein BtuF into the cytoplasm of Escherichia coli. The 2.6 angstrom crystal structure of a complex BtuCD-F reveals substantial conformational changes as compared with the previously reported structures of BtuCD and BtuF. The lobes of BtuF are spread apart, and B12 is displaced from the binding pocket. The transmembrane BtuC subunits reveal two distinct conformations, and the translocation pathway is closed to both sides of the membrane. Electron paramagnetic resonance spectra of spin-labeled cysteine mutants reconstituted in proteoliposomes are consistent with the conformation of BtuCD-F that was observed in the crystal structure. A comparison with BtuCD and the homologous HI1470/71 protein suggests that the structure of BtuCD-F may reflect a posttranslocation intermediate.


    Organizational Affiliation

    Institute of Molecular Biology and Biophysics, ETH Zurich, HPK D14.3, 8093 Zurich, Switzerland.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Vitamin B12 import system permease protein btuC AB326Escherichia coliMutation(s): 7 
Gene Names: btuC
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
BtuCD-F Complex; BtuCD B12 Transporter + BtuF binding protein
Find proteins for P06609 (Escherichia coli (strain K12))
Explore P06609 
Go to UniProtKB:  P06609
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Vitamin B12 import ATP-binding protein btuD CD249Escherichia coliMutation(s): 1 
Gene Names: btuD
EC: 3.6.3.33 (PDB Primary Data), 7.6.2.8 (UniProt)
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
BtuCD-F Complex; BtuCD B12 Transporter + BtuF binding protein
Find proteins for P06611 (Escherichia coli (strain K12))
Explore P06611 
Go to UniProtKB:  P06611
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Vitamin B12-binding protein btuF F245Escherichia coliMutation(s): 0 
Gene Names: btuF
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
BtuCD-F Complex; BtuCD B12 Transporter + BtuF binding protein
Find proteins for P37028 (Escherichia coli (strain K12))
Explore P37028 
Go to UniProtKB:  P37028
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.262 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 213.582α = 90
b = 127.396β = 112.76
c = 97.547γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling
SHARPphasing
CCP4phasing
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-08-14
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-10-18
    Changes: Refinement description