2DHH

Crystal structure of a multidrug transporter reveal a functionally rotating mechanism


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.307 
  • R-Value Work: 0.268 
  • R-Value Observed: 0.270 

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This is version 1.3 of the entry. See complete history


Literature

Crystal structures of a multidrug transporter reveal a functionally rotating mechanism

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

(2006) Nature 443: 173-179

  • DOI: https://doi.org/10.1038/nature05076
  • Primary Citation of Related Structures:  
    2DHH, 2DR6, 2DRD

  • PubMed Abstract: 

    AcrB is a principal multidrug efflux transporter in Escherichia coli that cooperates with an outer-membrane channel, TolC, and a membrane-fusion protein, AcrA. Here we describe crystal structures of AcrB with and without substrates. The AcrB-drug complex consists of three protomers, each of which has a different conformation corresponding to one of the three functional states of the transport cycle. Bound substrate was found in the periplasmic domain of one of the three protomers. The voluminous binding pocket is aromatic and allows multi-site binding. The structures indicate that drugs are exported by a three-step functionally rotating mechanism in which substrates undergo ordered binding change.


  • Organizational Affiliation

    Department of Cell Membrane Biology, Institute of Scientific and Industrial Research, Osaka University, Ibaraki, Osaka 567-0047, Japan. mura@sanken.osaka-u.ac.jp


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ACRB
A, B, C
1,053Escherichia coliMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P31224 (Escherichia coli (strain K12))
Explore P31224 
Go to UniProtKB:  P31224
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP31224
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.307 
  • R-Value Work: 0.268 
  • R-Value Observed: 0.270 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 225.87α = 90
b = 134.418β = 97.71
c = 163.192γ = 90
Software Package:
Software NamePurpose
SHARPphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-08-22
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-03-13
    Changes: Data collection, Database references