1L7V

Bacterial ABC Transporter Involved in B12 Uptake


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.262 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The E. coli BtuCD structure: a framework for ABC transporter architecture and mechanism.

Locher, K.P.Lee, A.T.Rees, D.C.

(2002) Science 296: 1091-1098

  • DOI: 10.1126/science.1071142

  • PubMed Abstract: 
  • The ABC transporters are ubiquitous membrane proteins that couple adenosine triphosphate (ATP) hydrolysis to the translocation of diverse substrates across cell membranes. Clinically relevant examples are associated with cystic fibrosis and with mult ...

    The ABC transporters are ubiquitous membrane proteins that couple adenosine triphosphate (ATP) hydrolysis to the translocation of diverse substrates across cell membranes. Clinically relevant examples are associated with cystic fibrosis and with multidrug resistance of pathogenic bacteria and cancer cells. Here, we report the crystal structure at 3.2 angstrom resolution of the Escherichia coli BtuCD protein, an ABC transporter mediating vitamin B12 uptake. The two ATP-binding cassettes (BtuD) are in close contact with each other, as are the two membrane-spanning subunits (BtuC); this arrangement is distinct from that observed for the E. coli lipid flippase MsbA. The BtuC subunits provide 20 transmembrane helices grouped around a translocation pathway that is closed to the cytoplasm by a gate region whereas the dimer arrangement of the BtuD subunits resembles the ATP-bound form of the Rad50 DNA repair enzyme. A prominent cytoplasmic loop of BtuC forms the contact region with the ATP-binding cassette and appears to represent a conserved motif among the ABC transporters.


    Organizational Affiliation

    Howard Hughes Medical Institute and Division of Chemistry and Chemical Engineering, Mail Code 147-75CH, California Institute of Technology, Pasadena, CA 91125, USA. locher@caltech.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
VITAMIN B12 TRANSPORT SYSTEM PERMEASE PROTEIN BTUC
A, B
326Escherichia coli (strain K12)Gene Names: btuC
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
BtuCD Vitamin B12 Transporter
Find proteins for P06609 (Escherichia coli (strain K12))
Go to UniProtKB:  P06609
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Vitamin B12 transport ATP-binding protein btuD
C, D
249Escherichia coli (strain K12)Gene Names: btuD
EC: 3.6.3.33
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
ATP Binding Cassette (ABC) Transporters
Protein: 
BtuCD Vitamin B12 Transporter
Find proteins for P06611 (Escherichia coli (strain K12))
Go to UniProtKB:  P06611
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
V4O
Query on V4O

Download SDF File 
Download CCD File 
C, D
CYCLO-TETRAMETAVANADATE
O12 V4
ACTPEXQBEHJTBO-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C, D
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.2 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.262 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 92.990α = 90.00
b = 106.292β = 99.29
c = 95.543γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
SHARPphasing
DENZOdata reduction
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-05-15
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance