1IWG

Crystal structure of Bacterial Multidrug Efflux transporter AcrB


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.50 Å
  • R-Value Free: 0.355 
  • R-Value Work: 0.290 

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This is version 1.2 of the entry. See complete history


Literature

Crystal structure of bacterial multidrug efflux transporter AcrB

Murakami, S.Nakashima, R.Yamashita, E.Yamaguchi, A.

(2002) Nature 419: 587-593

  • DOI: 10.1038/nature01050
  • Primary Citation of Related Structures:  
    1IWG

  • PubMed Abstract: 
  • AcrB is a major multidrug exporter in Escherichia coli. It cooperates with a membrane fusion protein, AcrA, and an outer membrane channel, TolC. We have determined the crystal structure of AcrB at 3.5 A resolution. Three AcrB protomers are organized as a homotrimer in the shape of a jellyfish ...

    AcrB is a major multidrug exporter in Escherichia coli. It cooperates with a membrane fusion protein, AcrA, and an outer membrane channel, TolC. We have determined the crystal structure of AcrB at 3.5 A resolution. Three AcrB protomers are organized as a homotrimer in the shape of a jellyfish. Each protomer is composed of a transmembrane region 50 A thick and a 70 A protruding headpiece. The top of the headpiece opens like a funnel, where TolC might directly dock into AcrB. A pore formed by three alpha-helices connects the funnel with a central cavity located at the bottom of the headpiece. The cavity has three vestibules at the side of the headpiece which lead into the periplasm. In the transmembrane region, each protomer has twelve transmembrane alpha-helices. The structure implies that substrates translocated from the cell interior through the transmembrane region and from the periplasm through the vestibules are collected in the central cavity and then actively transported through the pore into the TolC tunnel.


    Organizational Affiliation

    Department of Cell Membrane Biology, Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
AcrBA1053Escherichia coliMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P31224 (Escherichia coli (strain K12))
Explore P31224 
Go to UniProtKB:  P31224
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.50 Å
  • R-Value Free: 0.355 
  • R-Value Work: 0.290 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 144.536α = 90
b = 144.536β = 90
c = 519.178γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
SOLVEphasing
CNSrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-10-23
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Derived calculations, Version format compliance